汽油机缸内直喷混合过程三维瞬态数值模拟  

Three Dimensional Transient Numerical Simulation of Mixture Process in the Direct Injection Gasoline Engine Cylinder

作　　者：王立新[1] 刘斐[1] 魏明锐[2] 文华[3] 李程[2] 王海良[2] 周昌祁[2] 

机构地区：[1]泛亚汽车技术中心有限公司,上海201201 [2]武汉理工大学汽车工程学院 [3]南昌大学机电工程学院

出　　处：《小型内燃机与摩托车》2011年第2期38-42,共5页Small Internal Combustion Engine and Motorcycle

摘　　要：以KIVA程序作为三维瞬态模拟软件,对缸内直喷汽油机在4000r/min和6000r/min工况下缸内油气混合过程进行了数值模拟。结果表明：在4000r/min和6000r/min下缸内混合气的速度和浓度分布相似,火花塞附近的混合气当量比在1.2~1.5范围;在接近点火时刻,4000r/min的混合气分层效果较6000r/min的更为明显,有利于分层稀燃。计算结果可为直喷式汽油机的设计和性能改善提供一定的理论依据。Based on the KIVA codes,this paper simulates the air-fuel mixing process in a GDI gasoline engine under the conditions of 4000rpm and 6000rpm.The results show that the velocity and concentration fields are similar for the both of the two working conditions,while the equivalence ratio of the mixture around the spark plug is between 1.2~1.5 in the vicinity of the ignition time.And the stratification effect of mixture at 4000rpm is more obvious than that at 6000rpm,being beneficial to stratified lean combustion.The stimulate results are valuable for the designing and improving of the GDI engine.

关 键 词：缸内直喷 油气混合 数值模拟 

分 类 号：TK411.71[动力工程及工程热物理—动力机械及工程]