The Effect of Injection Location of DME and LPG HCCI Engine
Dimethyl ether (DME) as a high cetane number fuel and liquefied petroleum gas (LPG) as a high octane number fuel were supplied together to evaluate the controllability of combustion phase and improvement of power and exhaust emission in homogeneous charge compression ignition (HCCI) engine. Each fuel was injected at the intake port and in the cylinder separately during the same cycle, i.e., DME in the cylinder and LPG at the intake port, or vice versa. Direct injection timing was varied from 200 to 340 crank angle degree (CAD) while port injection timing was fixed at 20 CAD. In general, the experimental results showed that DME direct injection with LPG port injection was the better way to increase the IMEP and reduce emissions. The direct injection timing of high cetane number fuel was important to control the auto-ignition timing because the auto-ignition was occurred at proper area, where the air and high cetane number fuel were well mixed. In the case of port injection with high cetane number fuel, performance was limited due to early or constant combustion phase as the amount of fuel injection was increased.
Jinyoung Jang Choongsik Bae
Korea Advanced Institute of Science and Technology
国际会议
天津
英文
1-10
2009-08-19（万方平台首次上网日期，不代表论文的发表时间）