LNG发动机缸内气体流动及其对燃烧过程影响的数值分析  被引量:2

Numerical Analysis of the Airflow Motion in Cylinder and its Influence on the Combustion Process for LNG Engine

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作  者:吴端国[1] 罗福强[1] 李静波[2] 邹博文[2] 

机构地区:[1]江苏大学汽车与交通工程学院,江苏镇江212013 [2]中国汽车工程研究院

出  处:《小型内燃机与摩托车》2010年第1期31-33,48,共4页Small Internal Combustion Engine and Motorcycle

基  金:"国家863"资助项目(项目编号:2006AA11A1B4)

摘  要:应用STAR-CD软件对缸内直喷LNG发动机建立工作过程的计算模型,分析了缸内流场的运动及对发动机燃烧过程的影响。模拟结果表明:进气过程所产生的涡流运动能够维持到压缩上止点附近,压缩行程后期缸内的滚流破裂成众多小尺度的涡,湍流强度增大,可以提高火焰传播速率;压缩冲程接近终了时,缸内混合气呈明显分层现象,在火花塞及LNG喷嘴附近聚集较浓的可燃混合气,利于实现天然气发动机的稀薄燃烧。In this paper a numerical simulation of combustion process for a GDI LNG engine is carried out by using the commercial computational fluid dynamics software STAR - CD. The airflow motion in cylinder and its influence on the combustion process for engine were analyzed. The results of the numerical simulation show that the vortex flow formed during the intake process can be maintained to TDC, the large scale turbulence breaks up into very small scale vortex flow during the terminal compression stroke, the turbulence intensity in- creases, it can increase the speed of the flame spreading. At the end of compression stroke, the mixture in cylinder was stratified and the denser ignitable mixture was concentrated around the spark plug and the LNG nozzle under the action of the longitudinal intake vortex, thus lean burning of the natural gas could be realized.

关 键 词:LNG发动机 气流运动 燃烧过程 

分 类 号:TK433[动力工程及工程热物理—动力机械及工程]

 

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