摘要
为了深入研究非对称进气门升程技术的直喷汽油机缸内流动及油气混合过程,利用STAR-CD软件数值模拟了1 500转全负荷典型工况下发动机缸内的流动特性。对比分析了对称和非对称的进气门升程方案下,缸内的涡流比、滚流比、湍动能以及关注切面的流场分布和当量比等。结果表明:采用非对称进气门升程技术的直喷汽油机在进气和压缩冲程中除了能保持较强的滚流,还可以在缸内形成较强烈的涡流,这样使得缸内整体流动显著加强。另外,在点火时刻缸内的油气混合效果也有明显改善。
In order to research on the flow characteristics and the mixture process of the GDI engine with non-symmetrical intake valve lift, a typical work condition is numerical simulated by STAR-CD codes, which is a full load of 1500 r/rain. The swirl ratio, the tumble ratio, turbulent kinetic energy in cylinder as well as the flow field distribution of some interested sections which has symmetry and non-symmetrical intake valve lift are comparative analyzed. The results show that the GDI engine which uses the non-symmetrical intake valve lift technology can not only keep strong tumble during the intake and compress stroke, but also can get strong swirl in. cylinder. The flow can enforce evidently. In addition, the mixture effects improve effectively.
出处
《上海汽车》
2013年第3期43-47,共5页
Shanghai Auto
