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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korean Society of Mechanical Engineers B
Journal Basic Information
Journal DOI :
The Korean Society of Mechanical Engineers
Editor in Chief :
Volume & Issues
Volume 37, Issue 12 - Dec 2013
Volume 37, Issue 11 - Nov 2013
Volume 37, Issue 10 - Oct 2013
Volume 37, Issue 9 - Sep 2013
Volume 37, Issue 8 - Aug 2013
Volume 37, Issue 7 - Jul 2013
Volume 37, Issue 6 - Jun 2013
Volume 37, Issue 5 - May 2013
Volume 37, Issue 4 - Apr 2013
Volume 37, Issue 3 - Mar 2013
Volume 37, Issue 2 - Feb 2013
Volume 37, Issue 1 - Jan 2013
Selecting the target year
Numerical Study of Hydrogen/Air Combustion in Combustion Chamber of Ultra Micro Gas Turbine by Change of Flow Rate and Equivalence Ratio
Kwon, Kilsung ; Hwang, Yu Hyeon ; Kang, Ho ; Kim, Daejoong ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 2, 2013, Pages 103~109
DOI : 10.3795/KSME-B.2013.37.2.103
In this study, we performed a numerical study of hydrogen/air combustion in the combustion chamber of an ultra micro gas turbine. The supply flow rate and equivalence ratio are used as variables, and the commercial computational fluid dynamic program (STAR-CCM) is used for the numerical study of the combustion. The flow rate significantly affects the flame position, flame temperature, and pressure ratio between the inlet and the outlet. The flame position is close to the outlet in the combustion chamber, and the flame temperature and pressure ratio monotonously increases with the supply flow rate. The change in the equivalence ratio does not affect the flame position. The maximum flame temperature occurs under stoichiometric conditions.
Simulation of Valveless Pump Using Pumping Chamber Connected to Elastic Tube
Shin, Soo Jai ; Chang, Cheong Bong ; Sung, Hyung Jin ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 2, 2013, Pages 111~117
DOI : 10.3795/KSME-B.2013.37.2.111
A valveless pump consisting of a pumping chamber with an elastic tube was simulated using an immersed boundary method. The interaction between the motion of the elastic tube and the pumping chamber generated a net flow toward the outlet through a full cycle of the pump. The net flow rate of the valveless pump was examined by varying the stretching coefficient, bending coefficient, and aspect ratio of the elastic tube. Photographs of the fluid velocity vectors and the wave motions of the elastic tube were examined over one cycle of the pump to gain a better understanding of the mechanism underlying the valveless pump. The relationship between the gap in the elastic tube and the average flow rate of the pump was analyzed.
Study of Specific Resistance of Conductive Ink According to Temperature During Laser Sintering Process
Lee, Dae-Geon ; Park, Yong-Han ; Park, Ji-Young ; Kim, Dong-Keun ; Moon, Yoon-Jae ; Moon, Seung-Jae ; Hwang, Jun-Young ; Kang, Heui-Seok ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 2, 2013, Pages 119~124
DOI : 10.3795/KSME-B.2013.37.2.119
In this study, the two-dimensional transient temperature of printed Ag nanoparticle ink during continuous wave laser sintering was calculated. Ag nanoparticle ink was printed on a glass substrate by inkjet printing. Then, a 532-nm continuous wave laser with different laser intensities was irradiated on the printed Ag nanoparticle ink for 60 s. During laser irradiation, the in-situ specific resistance of the sintered ink was measured. To obtain the transient temperature of the sintered ink during the laser sintering process, a two-dimensional transient heat conduction equation was derived by applying the Wiedemann-Franz law. It was found that the specific resistance of the sintered ink decreased with an increase in the sintering temperature of the printed ink.
Development of Rotational Type of Wheel-Based Electromagnetic Induction Energy Harvester by Using Orthogonal Array
Park, Hyunchul ; Moon, Yongjun ; Kwon, Sejin ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 2, 2013, Pages 125~130
DOI : 10.3795/KSME-B.2013.37.2.125
According to the law revision of TPMS mounting obligations in Korea, researches about energy harvester which is the alternative of the battery are actively performed by many groups. Because WSN (Wireless Sensor Network) has the proposition of "Install and forget" and the power supplier also has the same performance as the vehicle's lifetime. In this paper, electromagnetic induction type of energy harvester through the relative motion between the rotating wheel and the fixed brake disc is introduced by using the most efficient source as the rotating motion in the view of vehicle's mechanism. The coil on the wheel and the permanent magnet at the brake disc are arranged in several ways. These various arrangements are the number of coil turns are consisted of design variables. By using the orthogonal array to reduce the experimental cost, the optimal composition is verified through the experiment. Finally the validity of the module is considered by measuring the level of storable electrical energy.
Study of Optimum Operating Conditions of Thermal Acoustic Generator
Shin, Sang Woong ; Oh, Seung Jin ; Lee, Yoon Joon ; Kim, Nam Jin ; Chun, Wongee ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 2, 2013, Pages 131~137
DOI : 10.3795/KSME-B.2013.37.2.131
This study deals with the effects of major geometric parameters on the sound wave output of a thermal acoustic system. The output power of the acoustic wave was dependent on the stack position, stack length, resonator tube length, and input power. In experiments, the maximum SPL was generated when the stack was placed between one-fourth to half, resonator and stack length were longer, and input power was increased. The frequency was recorded to be 437 and 885 Hz when the resonator tube length was 200 and 100 mm, respectively. Therefore, when the resonator tube length was shorter, a higher frequency was recorded.
Ejector Optimization for SOFC Anode Off-Gas Recirculation System
Jo, Sung Jong ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 2, 2013, Pages 139~148
DOI : 10.3795/KSME-B.2013.37.2.139
In this study, an ejector was designed to recirculate the anodic off-gas of SOFC, and a parametric study of the system performance was conducted at various ejector entrainment ratios. Aspen Plus, a chemical engineering program, was used to calculate the operational conditions of the ejector. To minimize the calculation load of the CFD and to ensure the global optimum, a genetic algorithm and Kriging model were used for the optimization. The optimization results showed that the dominant design variables of the sonic ejector are the throat diameter and the first flow nozzle position. The designed ejector has enough flexibility for different operating conditions of a 1-kW SOFC system. When the ejector was applied to the SOFC, it reduced 56% of the steam and 8.4% of the fuel compared to the reference case.
Development of Submersible Axial Pump for Wastewater
Yun, Jeong-Eui ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 2, 2013, Pages 149~154
DOI : 10.3795/KSME-B.2013.37.2.149
This study was performed to develop a high efficiency submersible axial pump for concentration wastewater treatment. To do this, we simulated the effect of some parameters such as the axial twist angle of a blade(
), the radial twist angle of a blade(
) and the length of a blade (l) on pump efficiency using commercial code, ANSYS CFX and BladeGen. The results showed that the axial twist angle of a blade(
) was the most sensible parameter on the pump efficiency. And the pump efficiency had a maximum at
and l=240 mm.
Study of Air-Breathing Polymer Electrolyte Membrane Fuel Cell Using Metal-Coated Polycarbonate as a Material for Bipolar Plates
Park, Taehyun ; Lee, Yoon Ho ; Chang, Ikwhang ; Ji, Sanghoon ; Paek, Jun Yeol ; Cha, Suk Won ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 2, 2013, Pages 155~161
DOI : 10.3795/KSME-B.2013.37.2.155
In this study, a metal-plated polycarbonate was adopted as a material for bipolar plates in a polymer electrolyte membrane fuel cell (PEMFC). The coated layers included 40-
-thick copper, 10-
-thick nickel, and 0.3-
-thick gold that respectively played the roles of current conduction, adhesion between copper and gold, and minimization of surface corrosion. The maximum power of the air-breathing PEMFC with polycarbonate bipolar plates was
, which was similar to that of graphite bipolar plates. Finally, the maximum power of a 12-cell stack of polycarbonate bipolar plates was
, and it had an operating time of 12 h. Therefore, this was considered a suitable material for bipolar plates in PEMFCs.
Study of Numerical Modeling of Swirl-Premix Burner for Simulation of Gas Turbine Combustion
Baek, Gwang Min ; Sohn, Chae Hoon ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 2, 2013, Pages 161~170
DOI : 10.3795/KSME-B.2013.37.2.161
The flow and combustion characteristics in a premixed swirl combustor with a double cone burner are numerically analyzed to adopt a swirler model. The internal recirculation zone formed at the burner exit can be realized by a swirler with inner and outer diameters of 56 and 152 mm, respectively, and accordingly, the flow rate and radial velocity were determined. To select the tangential velocity, swirl and recirculation angles are introduced. A tangential velocity of 40 m/s produces an internal recirculation zone similar to that in a combustor. At the liner exit, the errors in temperature and velocity are 2.8% and 0%, respectively, and they are negligibly small. However, NOx emissions are underestimated by 67% in the numerical results obtained using the swirler model. Although considerable quantitative errors are induced by the swirler model, it can be useful numerical model for the EV burner because it can approximately simulate the essential flow and combustion characteristics in a premixed swirl combustor with a double cone burner and it is expected to make combustion analysis efficient in a gas turbine combustor with complex geometries.
Theoretical Study on Fuel Savings of Marine Diesel Engine by Exhaust-Gas Heat-Recovery System of Combined Cycle
Choi, Byung Chul ; Kim, Young Min ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 2, 2013, Pages 171~179
DOI : 10.3795/KSME-B.2013.37.2.171
The thermodynamic characteristics of a combined cycle applied with a topping cycle such as a trilateral cycle at relatively high temperatures and a bottoming cycle such as an organic Rankine cycle at relatively low temperatures have been theoretically investigated. This is an electric generation system used to recover the waste heat of the exhaust gas from a diesel engine used for the propulsion of a large ship. As a result, when the boundary temperature between the topping and the bottoming cycles increased, the system efficiencies of energy and exergy were simultaneously maximized because the total exergy destruction rate (
) and exergy loss (
) decreased, respectively. In the case of a marine diesel engine, the waste heat recovery electric generation system can be utilized for additional propulsion power, and the propulsion efficiency was found to be improved by an average of 9.17 % according to the engine load variation, as compared to the case with only the base engine. In this case, the specific fuel consumption and specific
emission of the diesel engine were reduced by an average of 8.4% and 8.37%, respectively.
Study of Energy Management Strategy Considering Various Working Modes of Plug-in Hybrid Electric Tractor
Kang, Hyungmook ; Jung, Daebong ; Kim, Minjae ; Min, Kyoungdoug ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 2, 2013, Pages 181~186
DOI : 10.3795/KSME-B.2013.37.2.181
In recent years, eco-friendliness and high fuel economy have become important issues for commercial tractors. Electric tractors are often required for operation in a greenhouse. However, the battery capacity limits the available operation time. To overcome this problem, a plug-in hybrid electric tractor is considered a reasonable alternative. This tractor has a basic driving ability and can operate in various working modes such as mower, rotary, loader, and trailing. This study focuses on the energy management strategy by considering various working modes.
Analysis of Density Wave Oscillation in Boiler Furnace Wall Tubes with Parallel Channel Modeling
Kim, Jinil ; Choi, Sangmin ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 2, 2013, Pages 187~196
DOI : 10.3795/KSME-B.2013.37.2.187
A numerical model was developed to predict the density wave oscillation (DWO) in the furnace wall tubes of a fossil-fired once-through boiler. The transient flow fields in the tubes were obtained using a 1D finite volume method in the time domain. A header model was also implemented to simulate the parallel tube connection of the wall tubes. The inlet and outlet mass flow variation in one of the parallel tubes was examined after a heat perturbation to find the DWO. After successful verification with experimental results reported in literature, the developed model was applied to the wall tubes of a 700-MW boiler furnace. In contrast to the simulation of Takitani's experiment, in which the unstable power thresholds tended to rise in the reduced bypass channel flow, no remarkable changes were observed in the power thresholds in the parallel channel modeling of the wall tubes of the boiler furnace.
Effect of Flame Radiative Heat Transfer in Horizontal-Type HRSG with Duct Burner
Kim, Daehee ; Kim, Seungjin ; Choi, Sangmin ; Lee, Bong Jae ; Kim, Jinil ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 2, 2013, Pages 197~204
DOI : 10.3795/KSME-B.2013.37.2.197
A method was developed for analyzing the radiation heat transfer from the duct burner flame to the heat exchanger in a heat recovery steam generator (HRSG) in order to supplement the existing thermal design process. The burner flame and the heat exchanger were considered to be imaginary planes, and the flame temperature, surface, and emissivity were simplified using an engineering approach. Three analysis cases in which the duct burner position and fuel were changed were considered. The calculated flame radiative heat transfer and local flux on the heating surface were compared with those of 3-atomic gas radiation and convection. In all analysis cases, heat transfer by 3-atomic gas radiation was very small. The ratio of the flame radiative heat transfer to the convection heat transfer on the heating surface was estimated to be as high as 8-41%. Moreover, the local heat flux on the heating surface centerline was dominated by flame radiative heat flux.