非定常扰动 meaning in English

u teady perturbation
unsteady perturbation

In the pseudo - time region , high efficient lu - sgs scheme was used in time - marching . cases with uniform or non - uniform inlet stagnation pressure and with or without tip - gap flow were studied . computed results showed that complex structure vortex appeared and secondary flow occurred in the flow of cascade with tip - gap
对进口总压均匀或总压周向亏损(模拟上游尾迹) 、叶尖无间隙或有间隙等三种不同情况的流场计算结果，进行对比分析发现，流场中广泛存在流动分离、分离涡以及二次流，这是引发非定常扰动的根源。