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WAVE 프로그램을 이용한 SI 엔진의 VVT 효과가 출력 성능 향상에 관한 연구
처거(G.Tsogtjargal),권오석(Kwon O Seok),김대호(Dae Ho Kim),노진석(Jin-seok Noh),정종화(Jong-Hwa Jeong),김상호(Sang-Ho Kim),임옥택(Ock Taeck Lim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
This study is done by simulating 2.0 DOHC engine with WAVE 7.2 program of Ricardo and identified valve timing variables for increasing the performance of the engine. The simulation' results are highly agreed with WOT torque experimental data and helped to predict the tendency of performance as the valve timing change. Further, a VVT system can be used to improve fuel consumption, performance and emissions. This paper also describes the effect of VVT terms on WOT power, torque and residual gas content. WOT torque was higher when intake valves were closed early for low rpm and late for high rpm.
예혼합압축착화연소에서 Multi Zone Modeling을 이용한 압력상승률 저감을 위한 열성충화의 효과에 관한 연구
권오석(O Seok Kwon),처거(G. Tsogtjargal),임옥택(Ock Taeck Lim) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
HCCI's operating range is limited by an excessive rate of pressure rise during combustion and the resulting engine knock in high-load. The purpose of this study was to gain a better understanding of the effect of in-cylinder gas thermal stratification for reducing the pressure-rise rate in HCCI combustion. The engine was fueled with Di-Methyl Ether. The computations were conducted using both the standard single-zone version and a custom multi-zones version of the Senkin application of the CHEMKIN Ⅱ. This study shows that the potential for extending the high-load operating limit by adjusting the thermal stratification is very large.
Multi Zone Modeling을 이용한 열적성층화의 효과를 갖는 예혼합압축자기착화엔진의 압력상승률 저감에 대한 모사
권오석(O Seok Kwon),처거(G. Tsogtjargal),임옥택(Ock Taeck Lim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
HCCI's operating range is limited by an excessive rate of pressure rise during combustion and the resulting engine knock in high-load. The purpose of this study was to gain a better understanding of the effect of in-cylinder gas thermal stratification for reducing the pressure-rise rate in HCCI combustion. The engine was fueled with Di-Methyl Ether. The computations were conducted using both the standard single-zone version and a custom multi-zones version of the Senkin application of the CHEMKIN Ⅱ.
실험계획법과 WAVE 시뮬레이션을 이용한 엔진 작동 변수의 영향도 평가 및 최적화에 대한 연구
정동원(Dong Won Jeong),처거(Tsogtjargal),서열러(Soyoloo),임옥택(Ock Taeck Lim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The test of engine performance using the engine dynamometer needs technical researchers and facilities. A variety of CAE analysis programs and DoE(Design of Experiments) are used to analyze data efficiently instead of tests. The study got data from simulations of WAVE that used to model the SI engine to identify performance of engine. DoE makes it possible to know effectiveness of factors for power, BSFC, volume efficiency and find optimum condition in each factor through minimizing number of experiments. CA50 has effect on power and BSFC as volume efficiency is related with cylinder liner temperature and heat coefficients. The final result in DoE could be identified of consistency above 98% after substituting the data to WAVE.
온도 성층화를 갖는 예혼합압축자기착화엔진에서 초기압력변화에 관한 연구
권오석(O Seok Kwon),처거(G.Tsogtjargal),임옥택(Ock Taeck Lim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
HCCI engine is next generation engine, which has high efficiency and low emission. HCCI engine can be an alternative of SI engine and DI engine. However a pressure rise rate is a major cause of limitation of high load range and power reduction. Recently, we are able to reduce pressure rise rate by using thermal stratification. Nevertheless, it is not enough to get high power. In this study, we confirm that the reducing of a pressure rise rate by using thermal stratification and increased HCCI engine power by using boost pressure. We get those by using of CHEMKIN and modified SENKIN. Moreover, this study shows characteristic of the HCCI combustion by the effect of thermal stratification and booster pressure. Those are the result of thermal stratification condition. A CA50 and an IMEP were not affected by the thermal stratification. As a result, for thermal stratification condition, as initial average temperature increase and as thermal width is large, pressure rise rate become low. CA50 and IMEP were not affected by the thermal stratification. For increasing boost pressure, it is possible to get higher IMEP while the pressure rise rate increases little in HCCI with thermal stratification..
WAVE를 이용한 VVT 효과가 SI 엔진성능에 미치는 영향에 관한 시뮬레이션
임옥택(Ock Taeck Lim),김대호(Dae Ho Kim),두타(Diganta Dutta),처거(G.Tsogtjargal) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Variable Valve Timing (VVT) system can be used to improve fuel economy, performance and emissions. This study is identified the effect of VVT in terms of wide open throttle torque, Residual gas fraction, volume efficiency. Engine cycle simulations are performed on 2.0L DOHC in-line 4-cylinder SI engine by using WAVE of Ricardo. Results of the simulations had good agreement with WOT torque experimental data, and helped to predict the tendency of performance as the valve timings change. WOT torque was higher when intake valves were closed early for low rpm and late for high rpm.