首页|喷雾-壁面复合引导LPG直喷发动机混合气形成过程的数值解析

喷雾-壁面复合引导LPG直喷发动机混合气形成过程的数值解析

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利用液化石油气(LPG)优良的燃料特性,提出了一种新的喷雾-壁面复合引导燃烧系统.由激光诱导荧光法(PLIF)验证了计算模型准确性后,使用Fire V2011软件,对复合引导燃烧系统喷油器安装位置、燃料喷射方向和活塞凹坑形状等参数进行了优化,并确定了燃烧系统参数.最后数值解析了典型的部分负荷工况(2 000 r/min)喷雾-壁面复合引导LPG直喷发动机分层混合气的形成过程.结果表明:采用压缩冲程后期(40°CA BTDC)喷射,在接近点火时刻(20°CA BTDC)时从3孔喷油器的上部2孔喷出的LPG喷雾和下部1孔喷入燃烧室凹坑,在卷吸涡作用下引导至火花塞电极附近的LPG喷雾将交织在一起,在火花塞电极附近形成稳定的混合气分层构造;而整个燃烧室的空然比达60以上.
Numerical Analysis on Mixture Formation in a Spray-Wall Complex Guided LPG DI Engine
A spray-wall complex guided combustion system was proposed by utilizing the fuel characteristics of liquefied petroleum gas (LPG).Simulation model was verified by the experiment using the Plane Laser-Induced Fluorescence (PLIF),and optimizations on injector position,injection angle,and piston cavity shape were made using a commercial CFD code,Fire V2011.Mixture formation for the new combustion system at typical part load (2 000 r/min) was numerically simulated.Simulation results show that at the injection timing of 40 ° CA BTDC,the LPG sprays injected from the upper two holes reach the spark plug at the ignition timing of about 20 ° CA BTDC,while the LPG spray injected from the lower hole is directed to the spark plug through the vertical vortexes at the same time.These two part of mixture form a stable richer stratified mixture around the spark plug,and the maximum global air-fuel ratio reaches 60.

direct injection engineliquefied petroleum gasspray-wall complex guidedstratified lean combustionnumerical analysis

许伯彦、张现成、徐娟、齐运亮、于云飞

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山东建筑大学机电工程学院,山东济南250101

山东省科学院海洋仪器仪表研究所,山东青岛266001

清华大学汽车系,北京100084

直喷发动机 液化石油气 喷雾-壁面复合引导 分层稀燃 数值解析

国家自然科学基金资助项目国家自然科学基金资助项目

5107608551376113

2014

内燃机学报
中国内燃机学会

内燃机学报

CSTPCDCSCD北大核心EI
影响因子:0.76
ISSN:1000-0909
年,卷(期):2014.32(6)
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