【摘要】 通过对发动机气道内气体流动过程的相似分析 ,在雷诺Re 准则数足够大的前提下 ,非定性准则欧拉Eu 数和相似不变量无因次涡流NR 保持不变。这就证实通过稳流试验来测量气道的流通性能是可行的。通过数理推导 ,评价参数流量系数 μσ其实就是欧拉Eu 准则数的一种表现形式更多还原

【Abstract】 By the similarity analysis of flow process in engine’s port, it’s found that at the base that Renold number is big enough, in-qualitative rule Euler number Eu and similar invariable dimensionless swirl NR keep unaltered. This makes sure that it is feasible to obtain port’s flowing performance by stable flow test. Flowing coefficient, which is an estimating parameter, just is another presenting form of Euler number.更多还原