【作者】

YONG-SEOK LEE,HYUN-CHUN PARK

【摘要】

论文已在中国上海举行的第27届CIMAC大会上发表。论文的版权归CIMAC所有。Natural gas has received much attention as the new energy source due to its cleanness and low price. There are a lot of interests and researches about gas engines and Hyundai heavy Industries co LTD(HHI)also developed H35/40G gas engine successfully in 2010. Further researches including experiments and simulations proceeded to improve efficiency. For the minimization of the methane slip, the optimization of the gas supply timing and pressure was conducted and effect of the reduction in crevice volumes was evaluated. Ignition timing and AFR were varied to investigate the gas engine operating characteristics. The operating condition for the highest efficiency could be estimated and the maximum efficiency and limiting factors to the higher efficiency were found with the initial engine specifications. The numerical simulations were carried out to optimize the main components of the gas engine combustion systempre chamber, valve timing intake port and piston bowl The volume of prechamber was the dominant factor to control combustion speed. Advanced miller timing with the turbocharger matching was investigated and the higher flow coefficient and proper swirl ratio were mainly regarded in the intake port design Proper piston bowl shape was searched to have better combustion phase. New designs of the main components of the gas engine combustion system were suggested through the simulation and their effects were confirmed by the experiments. Finally, EGR test was conducted to evaluate the efficiency improvements by reducing NOx and suppressing the knocking

【会议名称】

第27届CIMAC会议

【会议地点】

上海

【下载次数】

1

返回