• Title/Summary/Keyword: Turbocharged diesel engine

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An experimental study on the flow characteristics of intake and exhaust in turbocharged diesel engine (배기 과급 디젤기관의 흡배기 유동특성에 관한 실험적 연구)

  • 배원섭
    • Journal of the korean Society of Automotive Engineers
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    • v.13 no.6
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    • pp.48-56
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    • 1991
  • This paper describes the experimental investigations on the pressure variations of intake and exhaust manifold and mass flow rate through exhaust turbine of turbocharged 6-cylinder diesel engine. The turbocharger of experimental diesel engine is constructed with the radial ty pe exhaust turbine and blower driven by exhaust gases. The pressure variations were measur ed by pressure transducer at the points such as turbine inlet and outlet, compressor inlet and outlet, and inlet pipe and exhaust manifolds for normal and combined charging engines with the change of engine speed. The experimental results of this study show that the mass flow rate of exhaust turbine and the variations of pressure in intake and exhaust manifold are all increased with the increase of engine speed.

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An Experimental Study on the Performance of Turbocharged Diesel Engine (터보과급 디이젤기관의 성능에 관한 실험적 연구)

  • Chae, J.O.;Chung, S.C.;Baek, J.H.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.2 no.6
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    • pp.76-86
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    • 1994
  • Combustion of diesel engine depends on the mixing of air and evaporating fuel during ignition delay greatly. Variation of air-fuel mixing rate and ignition delay for engine operating condition causes difference of combustion, performance and exhaust emissions. This study is investigated in a turbocharged diesel engine of IDI swirl chamber type. In the results, As injection timing is advanced until $12.6^{\circ}$ BTC, ignition delay decreases. NOx concentration and smoke level in exhaust gas increases for advanced injection timing Ignition delay, combustion period, pressure rise rate and exhaust gas temperature are increased with increasing engine speed. And ignition delay at high load is more decreased than that at low load. Ignition delay and combustion period are decreased with increasing intake pressure. Power increases, temperature and CO, NOx concentration in exhaust gas decreases as intake pressure increases. With increasing load, ignition delay is decreased and combustion period, motoring pressure are increased.

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A Study on the Decision of the Mount for the Newly Developed Diesel Engine using the Existing Engine Room (기존의 엔진룸을 이용한 신규 개발 디젤 엔진의 지지계 결정에 관한 연구)

  • 김규철;김주연;안상호
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.5
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    • pp.75-85
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    • 1998
  • This paper presents the procedures and technique of the decision on the decision on the mount in a diesel engine development newly. To assess the vibration chara- cteristics of the engine plus transmission, their inertia moments are calculated for three engine versions. i.e., NA(Naturally Aspirated), TC(Turbocharged) and TCI(Turbocharged and Intercooled). These data are used to determine the mount layout and stiffness values affecting the noise quality of an engine as well as a vehicle. The main purpose of this paper is to design the mount rubber having the optimal stiffness characteristics through the investigation of the calculation results and the mount conditions when an engine is installed in a vehicle using the existing engine mount room. Thus, this paper describes the optimal mount positions, rubber stiffnesses, natural frequency, mode shapes and so on using ADAMS program to apply the newly developed engines to three different vehicles.

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Effects of Intake Swirl and Combustion Parameters on the Performance and Emission in a V8 Type Turbocharged Intercooler Diesel Engine (흡기 선회유동 및 연소인자가 V8형 TCI 디젤엔진의 성능 및 배출가스특성에 미치는 영향)

  • Yoon Junkyu;Cha Kyungok
    • Transactions of the Korean Society of Automotive Engineers
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    • v.13 no.4
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    • pp.135-144
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    • 2005
  • The Effects of intake swirl and combustion parameters on the performance and emission characteristics in a V8 type turbocharged intercooler D.I. diesel engine of the displacement $16.7\iota$ were studied experimentally in this paper. Generally the swirl in the combustion process of diesel engine promotes mixing of the injection fuel and the intake air. Also, TCI diesel engine is put to practically use intercooler in order to increase boost efficiency which is cooled boost air. As a result of steady flow test, when the swirl ratio is increased, the mean flow coefficient is decreased, whereas the Gulf factor is increased. And through engine test, its can be effected to meet performance and emission by optimizing the main parameters; the swirl ratio is 2.25, compression ratio is 17.5, combustion bowl is re-entrant $8.5^{\circ}$, nozzle hole diameter is $\phi0.33^{\ast}3+\phi0.35^{\ast}2$, injection timing is BTDC $12^{\circ}CA$ and turbocharger is T02 model which are compressor 0.6A/R+46trim and turbine 1.0A/R+57trim.

A Study on the Thermal Stress Analysis of a Piston in a Turbocharged Diesel Engine (터보 디젤엔진 피스톤의 열응력 해석에 관한 연구)

  • 국종영
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.2
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    • pp.92-98
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    • 2001
  • We determined the transfer coefficient through the analysis of three dimensional temperature distribution in comparison with the measured temperature on the piston in the turbocharged diesel engine. And we analyzed the thermal stress and the thermal deformation with that heat transfer coefficient by using finite element method. According to this results, we found that maximum tempetature range of the piston appeared at the upper part of the piston crown and that the heat transfer coefficient of the upper part of the piston is smaller than that of the lower one. It showed that the maximum thermal deformation is shown at the edge of the upper part of piston and that the maximum thermal stress was shown on the lower part of the piston crown. Finally, we defined the method of determination of a piston heat transfer analysis by using measured temperature on the piston and analyzed temperature with finite element method.

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Effects of the Flow Characteristics of Helical Intake Port on the Performance and Emission in a Turbocharged DI Diesel Engine. (나선형 흡기포트의 유동특성이 과급식 디젤엔진의 성능 및 배출가스에 미치는 영향)

  • 윤준규;양진승;차경옥
    • Journal of Advanced Marine Engineering and Technology
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    • v.24 no.5
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    • pp.86-96
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    • 2000
  • This study is to consider that the helical intake port flow and fuel injection system have effects on the characteristics of engine performance and emissions in a turbocharged DI diesel engine of the displacement 9.4L. The swirl ratio for ports was modified by hand-working and measured by impulse torque swirl meter, For the effects on performance and emission, the brake torque, BSFC were measured by engine dynamometer and NOx, smoke were by gas analyzer and smoke meter. As a result of steady flow test, when the valve eccentricity ratio are closed to cylinder wall, the flow coefficient and swirl intensity are increased, And as the swirl is increased, the mean flow coefficient is decreasing, whereas the gulf factor is increasing. Also, through engine test its can be expected to meet performance and emission by the following applied parameter; the swirl ratio is 2.43, injection timing is BTDC $13^{\circ}$CA and compression is 15.5.

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Effects of Intake Port Swirl and Fuel Injection System on the Performance and Exhaust Emissions in a Turbocharged DI Diesel Engine (터보 차져 DI 디젤엔진에 있어서 성능 및 배기배출물에 미치는 흡기 포트 선회 유동 및 연료 분사계의 성능)

  • Yoon, Jun-Kyu;Cha, Kyung-Ok
    • Journal of ILASS-Korea
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    • v.10 no.3
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    • pp.45-53
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    • 2005
  • The purpose of this study is to analyze that intake port swirl and fuel injection system have an effect on the engine performance in a turbocharged D.I. diesel engine of the displacement 9.4L. As result of steady flow test, when the valve eccentricity ratio moved to cylinder wall, the flow coefficient and swirl intensity is increased. And as the swirl is increased, the mean flow coefficient is decreased, whereas the Gulf factor is increased. Through this engine test, it can be expected to meet performance and emissions by the following applied parameters; the swirl ratio is 2.43, injection timing is BTDC 13oCA and compression is 15.5.

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The Effects of Pulsating Flow on Volumetric Efficiency in the Intake and Exhaust System in a Turbocharged Diesel Engine (흡.배기 시스템의 맥동류가 과급디젤기관의 체적효율에 미치는 영향)

  • Kim, K.H.;Kang, H.Y.;Koh, D.K.
    • Journal of Power System Engineering
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    • v.13 no.4
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    • pp.11-17
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    • 2009
  • This paper deals with the effects of pulsating flow on volumetric efficiency, which may be generated during the gas exchange procedure, due to piston motion, valve event on intake and exhaust stroke and unsteady flow of turbocharger of a three-cylinder four stroke turbo-charged diesel engine. Consequently, volumetric efficiency affects significantly the engine performance; torque characteristics, fuel economy and further to emission and noise level. As the expansion ratio became larger the engine speed varies and torque increases, the pressure pulsation in an exhaust gas pipe acts as an increasing factor of intake air charging capacity totally. The phase and amplitude of pressure pulsation in the intake system only affects volumetric efficiency favorably, if it is well matched and tuned effectively to the engine. Thus, to verify the exact phase and amplitude of the pressure variation is the ultimate solution for the air-flow ratio assessment in the intake stroke. Some experimental results of pressure diagrams in the intake pipe and gas-flow of turbine in-outlet are presented, under various kinds of operating condition.

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Evaluation on a Miller Cam for Improving the Fuel Consumption of a Large Diesel Engine (대형 디젤 엔진의 연비 향상을 위한 Miller Cam 평가)

  • Song, Changhoon;Wang, Tae Joong;Im, Heejun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.24 no.1
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    • pp.47-52
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    • 2016
  • Miller timing is one of the promising ways which can improve the fuel consumption of internal combustion engines. Indeed, Miller timing employing an early intake valve close is widely applied to large diesel and gas engines to enhance performance and reduce NOx emissions. In this study, performance evaluation is carried out by 1-D cycle simulation in order to estimate the effect of Miller CAM timing before BDC for a 32 L turbocharged diesel engine. To optimize Miller CAM timing, a single stage turbocharger is matched with an early intake valve close since boost pressure is a significant parameter that can control compression work in a turbocharged engine. The engine simulation result shows that there is enough potential to improve fuel consumption rate and also reduce NOx emissions at the same time.Abstract here.

Engine Performance Simulation to Evaluate the NOx Reduction of Charge Air Moisturizer System in a Medium Speed Diesel Engine (흡기가습 중형 디젤 엔진의 NOx 저감 평가를 위한 성능 해석 연구)

  • Kim, Ki-Doo;Park, Hyoung-Keun;Kim, Byung-Suck;Ha, Ji-Soo
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2005.11a
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    • pp.15-16
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    • 2005
  • In this study, the characteristics of NOx reduction by using charge air moisturizer system were evaluated by engine performance simulation in medium speed diesel engines. The results of performance simulation were verified by experimental results of single cylinder medium speed diesel engine equipped with charge air moisturizer system. Performance simulation was carried out to evaluate charge air moisturizer system of turbocharged diesel engine, HYUNDAI HiMSEN 9H25/33 engine. Those results show 50% NOx reduction at dew point $80^{\circ}C$ and charge air pressure 4bar.

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