摘要
对170系列柴油机双进气道进行了AVL气道稳流试验,得到了不同气门升程下对应的AVL流量系数和涡流比;在与稳流试验对等的边界条件及评价方法下,利用CFD软件Fire对气道稳流试验进行了数值模拟。模拟结果与试验结果的对比表明,数值模拟所得流量系数和涡流比与试验结果基本吻合,模拟结果具有一定的可信度;另外,从两者涡流比随气门升程的变化曲线来看,切向气道气门座孔加工出的偏心倒角,对气道形成涡流的能力影响比较大,尤其是在气门开度较小时,能使气道产生相对较大的涡流比。
AVL steady flow test was carried out on 170 series diesel double-intake port,and the AVL flow coefficient and swirl ration under different air valve lift were obtained.With the same boundary conditions and evaluation methods,CFD software Fire was applied to simulate the steady flow in intake port.The comparison results show that the flow coefficient and swirl ratio from numerical simulation are consistent with those from testing,and the accuracy of simulation is acceptable.In addition,according to the proportional relation between swirl ratio and valve lift,the machined eccentric chamfer on valve seat of tangential port has a profound impact on swirl generation,especially in condition of small valve lift,which may result in bigger swirl ratio.
出处
《柴油机》
2010年第4期24-28,共5页
Diesel Engine
关键词
柴油机
双进气道
稳流试验
数值模拟
diesel engine
double intake port
steady flow test
numerical simulation
