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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korean Society of Automotive Engineers
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Journal DOI :
The Korean Society of Automotive Engineers
Editor in Chief :
Volume & Issues
Volume 16, Issue 6 - Nov 2008
Volume 16, Issue 5 - Sep 2008
Volume 16, Issue 4 - Jul 2008
Volume 16, Issue 3 - May 2008
Volume 16, Issue 2 - Mar 2008
Volume 16, Issue 1 - Feb 2008
Selecting the target year
Worst Case Scenario Generation on Vehicle Dynamic Stability and Its Application
Jung, Dae-Yi ; Jung, Do-Hyun ; Moon, Ki-Hyun ; Jeong, Chang-Hyun ; Noh, Ki-Han ; Choi, Hyung-Jeen ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 1~9
The current test methods are insufficient to evaluate and ensure the safety and reliability of vehicle system for all possible dynamic situation including the worst case such as rollover, spin-out and so on. Although the known NHTSA J-turn and Fish-hook steering maneuvers are applied for the vehicle performance assessment, they aren't enough to estimate other possible worst case scenarios. Therefore, it is crucial for us to verify the various worst cases including the existing severe steering maneuvers. This paper includes the procedure to search for other useful worst case based upon the existing worst case scenarios mentioned above and its application in simulation basis. The only human steering angle is selected as a design parameter here and optimized to maximize the index function to be expressed in terms of either roll angle or yaw rate. The obtained scenarios were enough to generate the worst case to meet NHTSA worst case definition (ex.2-inch wheel lift). Additionally, as an application, the worst case steering maneuver is acquired for the vehicle to operate with a simple ESP system. It has been concluded that the new procedure in this paper is adequate to create other feasible worst case scenarios for a vehicle system both with an intelligent safety control system and without it.
Prediction of Air Pocket Pressure in Draw Die during Stamping Process
Koo, Tae-Kyong ; Hwang, Se-Joon ; Park, Warn-Gyu ; Oh, Se-Wook ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 10~18
Metal stamping is widely used in the mass-production process of the automobile industry. During the stamping process, air may be trapped between the draw die and the panel. The high pressure of trapped air induces imperfections on the panel surface and creates a situation where an extremely high tonnage of punch is required. To prevent these problems, many air ventilation holes are drilled through the draw die and the punch. The present work has developed a simplified mathematical formulation for computing the pressure of the air pocket based on the ideal gas law and isentropic relation. The pressure of the air pocket was compared to the results by the commercial CFD code, Fluent, and experiments. The present work also used the Bisection method to calculate the optimum cross-sectional area of the air ventilation holes, which did not make the pressure of the air pocket exceed the prescribed maximum value.
The Performance Test of SCR System in a Heavy-Duty Diesel Engine
Baik, Doo-Sung ; Lee, Seang-Wock ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 19~25
Selective Catalytic Reduction is effective in the reduction of NOx emission. This research focused to evaluate the performance of a urea-SCR system and was conducted in two procedures. One is SCR reactor test using model gas in order to provide an optimal injection condition itself. In this step, some parametric study on emission temperature, space velocity, aspect ratio and the formation of urea spray were made by using flow visualization and Computation Fluid Dynamics techniques. The basic simulation results contributed in determining the layout for an actual engine test. The other is an engine performance and emission test. The urea injector was placed at the opposite direction of exhaust gases emitted into an exhaust duct and an optimal amount of a reducing agent is estimated accurately under different engine loads and speeds. Furthermore, the variation of NOx emission and applied amount of urea was investigated in terms of modes under the condition of with and without SCR, and other emissions such as PM, CO and NMHC were evaluated quantitatively as well. This research may provide fundamental data for the practical use of urea-SCR in future.
Optimization of the Parallel Diesel Hybrid Vehicle
Yeom, Ki-Tae ; Yang, Jae-Sik ; Bae, Choong-Sik ; Kim, Hyun-Ok ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 26~32
This research presents a simulation for the fuel economy of parallel diesel hybrid vehicle. Diesel engines compared to gasoline engines have the advantages of higher fuel economy and lower
emission. One of the most ways to meet future fuel economy and emissions regulation is to combine diesel engine technology with a hybrid electric vehicle. The simulation of HEV is growing need for rapid analysis of the many configurations and component options. WAVE, a one-dimensional engine analysis tool, was used to a 2.7L diesel engine. ADVISOR, designed for rapid analysis of the performance and fuel economy of vehicle models, was used to conventional and hybrid electric vehicle by the use of output file from WAVE as the input engine data file for ADVISOR. A parallel diesel HEV is at least
higher fuel economy and improved acceleration ability compared to a conventional diesel vehicle. The energy loss of the parallel diesel HEV is
less than the conventional vehicle using regeneration.
Analysis System for Practical Dynamic Load with Hybrid Method under Random Frequency Vibration
Song, Joon-Hyuk ; Yang, Sung-Mo ; Kang, Hee-Yong ; Yu, Hyo-Sun ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 33~38
Most structures of vehicle are composed of many substructures connected to one another by various types of mechanical joints. In vehicle engineering, it is important to study these jointed structures under random frequency vibration for the evaluations of fatigue life and stress concentration exactly. It is rarely obtained the accurate load history of specified positions in a jointed structure because of the errors such as modeling, measurement, and etc. In the beginning of design, exact load data are actually necessary for the fatigue strength and life analysis to minimize the cost and time of designing. In this paper, the hybrid method of practical dynamic load determination is developed by the combination of the principal stresses from F. E. Analysis and test of a jointed structure. Least square pseudo inverse matrix is adopted to obtain an inverse matrix of analyzed stresses matrix. The error minimization method utilizes the inaccurate measured error and the shifting error that the whole data is stiffed over real data. The least square criterion is adopted to avoid these errors. Finally, to verify the proposed system, a heavy-duty bus is analyzed. This measurement and prediction technology can be extended to the different jointed structures.
Web-based Design Support System for Automotive Steel Pulley
Kim, Hyung-Jung ; Lee, Kyung-Tae ; Chun, Doo-Man ; Ahn, Sung-Hoon ; Jang, Jae-Duk ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 39~47
In this research, a web-based design support system is constructed for the design process of automotive steel pulley to gather engineering knowledge from pulley design data. In the design search module, a clustering tool for design data is proposed using K-means clustering algorithm. To obtain correlational patterns between design and FEA (Finite Element Analysis) data, a Multi-layer Back Propagation Network (MBPN) is applied. With the analyzed patterns from a number of simulation data, an estimation of minimum von mises can be provided for given design parameters of pulleys. The case study revealed fast estimation of minimum stress in the pulley within 12% error.
Design Principle for Disassemblability of Products
Mok, Hak-Soo ; Han, Chang-Hyo ; Jeon, Chang-Su ; Song, Min-Jun ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 48~57
This paper shows the procedure to decide an optimal design principle for improving the disassemblability with considering of disassembly conditions. On the bssis of the disassembly mechanism of products and the structure of parts and subassembly, the disassemblability is classified into four categories: graspability, accessibility, transmission of disassembly power and handling. The weighting values of the influential factors are calculated by the method of AHP(Analytic Hierarchy Process). The disassemblability is evaluated quantitatively. We established some score tables for the evaluation. Using these score tables, several principles for higher disassemblability in accordance with work conditions can be decided. An optimal design principle can be found by the comparison with the total scores of some disassembly conditions.
Development of Lightweight Aluminum I Type Radius Rod for Heavy Trucks
Choi, Gyoo-Jae ; Lee, Keen-Yeong ; Ha, Tae-Soo ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 58~64
An aluminum radius rod using rheo-forging method has been developed for heavy commercial vehicles to decrease vehicle unsprung weight. To design the shape of the rod, structural simulations are performed using two load cases. To evaluate durability performance of the rods, a test system which has simultaneous 3 axes actuating system is developed. And 3 axes durability test conditions are established based on vehicle field tests. Using the test systems and the conditions, the durability test is carried out and the rods have passed the test conditions of 700,000 cycles. The weight of a developed aluminum radius rod is 4.2kg and it was drastically reduced by 48.8 percent in comparison with the weight of a steel radius rod.
Development and Optimization of the Hybrid Engine System Model to Improve the Fuel Economy
Lee, Dong-Eun ; Hwang, In-Goo ; Jeon, Dae-Il ; Park, Sim-Soo ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 65~73
The purpose of this study is development of universal engine model for integrated Hybrid Electric Vehicle (HEV) simulator and a optimization of engine model. The engine model of this study is based on the MATLAB Simulink for universal and include engine fuel economy technologies for HEV. Various engine fuel economy technologies for HEV is estimated by commercial engine 1-D simulation program - WAVE. And, the 1-D simulation model of base version is compared with engine experiment result. The analyzed engine technologies with 1-D simulation are Dual-CVVT, Atkinson-Cycle and Cylinder-Deactivation System. There are improvement of fuel economy and power performance with Dual-CVVT model at part load and full load, pumping loss reduction with Cylinder-Deactivation System at idle and regeneration. Each estimated technologies are analyzed by 1-D simulation on all operation region for base data to converse simulink. The simulink based engine model maintains a signal with ECU for determination of engine operation point.
Development of a Multi-zone Combustion Model for the Analysis of CAI Engines
Lee, Kyeong-Hyeon ; Lim, Jae-Man ; Kim, Young-Rae ; Min, Kyoung-Doug ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 74~80
A combustion of CAI engine is purely dominated by fuel chemical reactions. In order to simulate the combustion of CAI engine, it should be considered the effect of fuel components and chemical kinetics. So it needs enormous computational power. To overcome this problem reduced problem of needing massive computational power, chemical kinetic mechanism and multi-zone method is proposed here in this paper. A reduced chemical kinetic mechanism for a gasoline surrogate was used in this study for a CAI combustion. This gasoline surrogate was modeled as a blend of iso-octane, n-heptane, and toluene. For the analysis of CAI combustion, a multi-zone method as combustion model for a CAI engine was developed and incorporated into the computational fluid dynamics code, STAR-CD, for computing efficiency. This coupled multi-zone model can calculate 3 dimensional computational fluid dynamics and multi-zoned chemical reaction simultaneously in one time step. In other words, every computational cell interacts with the adjacent cells during the chemical reaction process. It can enhance the reality of multi-zone model. A greatly time-saving and yet still relatively accurate CAI combustion simulation model based on the above mentioned two efficient methodologies, is thus proposed.
Optimum Design of a Geometrically Asymmetric Trapezoidal Fin Based on the Fixed Fin Base Height
Kang, Hyung-Suk ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 81~87
A geometrically asymmetric trapezoidal fin with variable fin base thickness and height is optimized based on the fixed fin base height using a one-dimensional analytic method. The temperature profile along the normalized X position in the fin is presented. For the fixed fin base height, the optimum heat loss, fin length and efficiency as a function of inside fluid convection characteristic number, fin base thickness and height, fin shape factor, convection characteristic numbers ratio and ambient convection characteristic number are represented. One of the results shows that the effect of fin base height and ambient convection characteristic number on the optimum values is remarkable.
Improvement of Emission Performances of a HSDI Diesel Engine with Partial Premixed Compression Ignition Combustion Method
Chung, Jae-Woo ; Kang, Jeong-Ho ; Kim, Nam-Ho ; Min, Kyoung-Doug ; Lee, Ki-Hyung ; Lee, Jeong-Hoon ; Kim, Hyun-Ok ; Kang, Woo ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 88~96
Currently, due to the serious world-wide air pollution by substances emitted from vehicles, emission control is enforced more firmly and it is expected that the regulation requirements for emission will become more severe. A new concept combustion technology that can reduce the NOx and PM in relation to combustion is urgently required. This study used a split injection method at a 4 cylinder common-rail direct injection diesel engine in order to apply the partially premixed charge compression ignition combustion method without significantly altering engine specifications And it is investigated that the effects of the injection ratio and SCV(swirl control valve) to emission characteristics. From these tests, soot(g) and NOx(g) emission could be reduced to 40% and 92% compared to base engine performance at specified engine driving conditions(6 points with weight factors) according to application of split injection and SCV(swirl control valve).
A Strength Analysis of Rack and Pinion of Steering Gear Assay using a Commercial Finite Element Program
Sung, Kee-Woong ; Lim, Jang-Keum ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 97~103
In general, the strength of gears is calculated using the formula of AGMA or JGMA. But these formula can not be applied directly to the strength calculation of the rack and pinion of steering gear assay, because of complex tooth and contact shapes. So Lewis bending stress and Hertzian contact stress formula are generally used for the design of rack and pinion of steering gear assay. But these formula do not also give the exact stress of rack and pinion. In this paper, comparing the finite element analysis results and the experimentally measured values, it is shown that the finite element modeling technique of the rack and pinion of steering assay is reasonable.
A Study for the Fuel Economy Improvement of a Heavy Duty Engine in Commercial Vehicles(II)
Lyu, Myung-Seok ; Doo, Byung-Mann ; Ku, Young-Gon ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 104~108
Recently, studies conducted by our research group, revealed the possibility for reducing BSFC, NOx and PM emissions to meet the Euro 4 & 5 legislations. The main objective of the present study is to get better fuel economy in commercial vehicles by considering real driving conditions. Firstly, in order to improve fuel economy on fields, specifically it is required to analyze the driving pattern and make the representative modes from real field data. Secondly, it is performed to make the engine dynometer test to optimize the fuel consumption by reflecting on the representative driving modes, based on the Korea 2008 emission legislation equal to the Euro 4. The engine components such as engine calibration, combustion chamber, turbocharger and ancilliaries were modified to optimize vehicle fuel economy over a typical customer drive cycle whilst still meeting the exhaust emission restrictions. Finally, these results were confirmed by field testing of vehicle equipped with the updated calibration engine. It was placed the two vehicles together traveling the same route and accomplishing the same amount of stops(back to back), in order to evaluate the fuel consumption in comparison to the current vehicle. Through several repeats such as the engine calibration and field test, we could get 3 % to 7.7 % vehicle fuel economy improvements compared to previous vehicle.
Effect of Engine Friction on Vehicle Fuel Economy during Warm-up
Lim, Gun-Byoung ; Wi, Hyo-Seong ; Park, Jin-Il ; Lee, Jong-Hwa ; Park, Kyoung-Seok ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 109~114
An improvement of vehicle fuel economy is one of the most important topic in automotive engineering. Lots of engineers make efforts to achieve 1% of fuel economy improvement. Engine friction is an important factor influencing vehicle fuel economy. This paper focuses on effect of engine friction on vehicle fuel economy during warm-up. A computer simulation is one of the powerful tools in automotive engineering field. Recently Simulation is attempting to virtual experiment not using expensive instruments. It is possible to presuppose fuel economy by changing the characteristic of accessories using CRUISE(vehicle simulation software). In this paper, fuel consumption at each part of the vehicle is analyzed by both of experiment and simulation. The results of fuel economy analysis on experiment substitute for Cruise to calculate fuel economy. The simulation data such as engine speed, brake torque, shift pattern, vehicle speed, fuel consumption level is well correlated to experiment data. In this paper, the change of warm-up time, faster or slower, through simulation is performed. As a result of the fast warm-up, fuel economy is improved up to 1.7%.
Effect of Sensitivity Variation for Mounting Methods of Accelerometer in Crash Test
Jang, Won-Ho ; Kim, Ki-Oh ; Beom, Hyen-Kyun ; Kwon, Sung-Eun ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 115~120
There are many typesof accelerometer sensor. There was mainly used high-g accelerometer to obtain data for vehicle in crash test. Accelerometer was mounted on test vehicle with mounting blocks. Test result can be influenced by condition of mounting i.e. bonding material and type of block. These influences can be evaluated to variation of sensitivity in calibration test. In this paper, Calibration test were carried out for 3 types of bonding material i.e. stud, beewax and double side tape. Other factor was taken into consideration by 3-types for mounting block. All test was conducted by sinusoidal signal vibrator up to 4500Hz. In order to investigate influence for sensitivity from different input voltage in the calibrator, the same test was repeated. Test results were compared with standard accelerometer data. Relative sensitivities and phases were showed small difference in sensitivity for bonding materials with one block, but significant one for another block and different input voltage below 1000Hz.
Study on the Design Methodology of Constant Velocity Joints for Passenger Cars using DOE
Jeong, Chang-Hyun ; Jung, Do-Hyun ; Bae, Won-Rak ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 121~133
We presented design methodology of constant velocity joint for passenger cars using design of experiment. On the basis of contact normal stress of internal components of constant velocity joints, we performed a sensitivity analysis of several design parameters. And then we performed robust design and optimization design process. As a result, we could find robust design and also propose the optimized design. Presented design process would be very helpful for engineers who are suffer for new constant velocity joint design.
Development of a Vision Sensor-based Vehicle Detection System
Hwang, Jun-Yeon ; Hong, Dae-Gun ; Huh, Kun-Soo ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 134~140
Preceding vehicle detection is a crucial issue for driver assistance system as well as for autonomous vehicle guidance function and it has to be performed with high reliability to avoid any potential collision. The vision-based preceded vehicle detection systems are regarded promising for this purpose because they require little infrastructure on a highway. However, the feasibility of these systems in passenger car requires accurate and robust sensing performance. In this paper, an preceded vehicle detection system is developed using stereo vision sensors. This system utilizes feature matching, epipoplar constraint and feature aggregation in order to robustly detect the initial corresponding pairs. After the initial detection, the system executes the tracking algorithm for the preceded vehicles including a leading vehicle. Then, the position parameters of the preceded vehicles or leading vehicles can be obtained. The proposed preceded vehicle detection system is implemented on a passenger car and its performances is verified experimentally.
Development of 590MPa Grade Galvannealed TRIP Steel Sheets containing Low Silicon Contents for High Strength and Formability
Chi, Kwang-Sub ; Kim, Yong-Hee ; Kim, Byoung-Il ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 141~147
Hot-dip galvannealed sheet (GA) with high strength of 590MPa grade in tensile strength, has developed for automotive applications. However, for a successful application, the microstructure and galvannealing behavior of galvannealed TRIP steel sheets must be strictly controlled. High silicon contents steel has problems with weld-ability, zinc coating and reduction of retained austenite volume fraction after galvannealing process. The main purpose of this study is to solve the problem as indicated above.
Effect of Inlet Valve Angle on In-Cylinder Swirl Generation Characteristics(I)
Ohm, In-Yong ; Park, Chan-Jun ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 148~156
This paper is the first of 2 companion papers which investigate in-cylinder swirl generation characteristics according to inlet valve angle. Two DOHC 4 valve engines, one has wide intake valve angle and the other has narrow valve angle, were used to compare the characteristics of swirl motion generation in the cylinder. One intake port was deactivated to induce swirl flow. A PIV (Particle Image Velocimetry) was applied to measure in-cylinder velocity field according to inlet valve angle during intake stroke. The results show that the stronger swirl motion is observed in wide valve angle engine at the early intake stage; however, the swirl motion is gradually distorted by the intake flow component passing through valve area near the cylinder wall as the stroke proceeds. The tumble motion also does so in wide angle. On the contrary, the swirl and tumble motions, which are not clear at the initial stage, become better and better arranged as the piston goes down and up again after bottom dead center.
A Derivation of the Standard Design Guideline for Crashworthiness of High Speed Train with Power Cars
Kim, Geo-Young ; Cho, Hyun-Jik ; Koo, Jeong-Seo ; Kwon, Tae-Soo ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 157~167
Through this study, the standard design guidelines for high speed train with power cars have been derived to meet the crashworthiness requirements of the Korean rollingstock safety regulation. The crashworthiness regulation requires some performance requirements for two heavy collision accident scenarios; a train-to-train collision at the relative speed of 36 kph, and a collision against a standard deformable obstacle of 15 ton at 110 kph. A standard high speed train composition was defined as 2PC-2ET-6T with 17ton axle load, similar to KTX-2 for the Honam express line. Using theoretical and numerical analyses, some crashworthy design guidelines were derived in terms of mean crush forces and energy absorptions for major crushable components. The derived design guidelines were evaluated and improved using one dimensional spring-mass dynamic simulation. It is shown from the simulation results that the suggested design guidelines can easily satisfy the domestic crashworthiness requirements.
Development of a Catalytic Combustor for DPF Regeneration of In-use Light Duty Diesel Vehicles
Kim, Hong-Suk ; Choi, Hyun-Ha ; Cho, Gyu-Baek ; Jeong, Young-Il ; Cho, Sung-Ho ; Park, Jong-Soo ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 168~175
In-use light duty diesel vehicles are considered as one of major sources of particulate emissions in many cities, and the start of the retrofit program for the light duty diesel vehicles is expected in near future in Korea. One of the problems of the retrofit of the light duty diesel vehicles is that the exhaust gas temperature is too low to apply passive regeneration DPF systems. This study introduces a catalytic combustor as a new active DPF regeneration technology. This study shows the principle and characteristics of DPF regeneration by the catalytic combustor and suggests it's proper control method for better regeneration.
Evaluation on Performance of an Electrostatic Diesel PM Trap Device and Its Application to Diesel Engine After-treatment
Kim, Hak-Joon ; Han, Bang-Woo ; Kim, Yong-Jin ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 176~183
Performance of electrostatic diesel PM filtration systems (E-DPS) with different types has been tested using the carbon particles generated by spark discharge in laboratory. Among the five electrostatic precipitators, the multiple wires cylindrical E-DPS with the highest collection efficiency and relatively lower differential pressure at the flow rate of
/min, as an applicable device to diesel engine as an after treatment system, has been combined with another collection cylinder to improve the collection efficiency of diesel particulate matters generated from diesel engines. The multiple wires cylindrical E-DPS combined with the cylindrical collector showed the collection efficiency of more than 60% at the engine speed of 2,000 rpm with the engine loads of 25 and 50%.
A Study on Remanufacturing Industry for Automobile Parts
Mok, Hak-Soo ; Jeon, Chang-Su ; Han, Chang-Hyo ; Song, Min-Jun ; Park, Byung-Sun ; Kwak, Hyun-Soo ; Park, Sang-Jin ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 184~191
In this paper, it was performed to protect the remanufacturing industry of domestic automobile part and grasp the latest tendency of remanufacturing industry of domestic automobile part for development of remanufacturing technology and economical support of government. Research on the present statue of the remanufacturing industry was indicated that the number of remanufacture enterprises about automobile part, the annual, the number of employee in remanufacture and the type of remanufacturing. The general problems were presented which blocked the activities of domestic automobile part. It was also presented that problem of remanufacturing technology side and quality assurance of remanufactured automobile part and found out solution.
The Study on the Effects of Mixer Configurations on Fluid Mixing Characteristics in SCR Systems
Seo, Jin-Won ; Lee, Kyu-Ik ; Oh, Jeong-Taek ; Choi, Yun-Ho ; Lee, Jong-Hwa ; Park, Jin-Il ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 6, 2008, Pages 192~199
The key issues for the reduction technologies of the exhaust gas from diesel engine being developed are to reduce particulate matters and NOx. The SCR system is known to be one of the most efficient and stable technologies to remove NOx through the mixing of NOx and urea solution. In the present research, the effects of mixer configurations of SCR system have been investigated to enhance the SCR performance. First, a Schlieren technique is employed to visualize the mixing characteristics of urea solution and exhaust gas. The results show that a mixer is essential to obtain proper fluid mixing. In addition, numerical studies have been made to understand the mixing characteristics through the comparison of the mal-distribution index of concentration at the several locations of the diffuser. In particular, the effects of number of blade and mixer angles on mixing characteristics were studied. The results show that the blade angle has a larger effect on the mixing characteristics than the number of blades.