跨声速压气机中动叶弯和掠对尾迹输运的影响

对一单级跨声速压气机设计工况下采用了3种弯、掠动叶后的非定常流场进行了数值模拟,分析了动叶弯、掠对动叶尾迹的非定常脉动强度以及向下游输运特性的影响.研究结果表明:与原型动叶相比,3种弯、掠动叶都减弱了动叶出口的泄漏涡和尾迹顶部脉动核心的脉动强度,使其在向下游输运过程中耗散较快;3种弯、掠动叶尾迹的中间段的脉动强度都有所加强,并且在输运过程中有向根部迁移的趋势,从而会使静叶的中部和根部受到较强的扰动.

Effect of bowed and swept rotors on wake transportation in a transonic compressor

The unsteady 3-D flow fields in a transonic compressor at design point were simulated numerically to study the effect of the bowed and swept rotors on rotor wake fluctuation intensity and transportation progress.The results show that,as compared to the baseline,all three types of bowed or swept rotors weaken the fluctuation intensity of tip leakage vortex and the top fluctuation core of wake at rotor outlet,thus quickening the dissipation during downstream transportation and helping to reduce the unsteady disturbance on the top of stator.The fluctuation intensity of the middle part of swept or bowed rotor wake increases to some extent,and the middle-part low energy fluid of rotor wake intends to move downwards during transportation,so the stator is disturbed stronger at mid-span and near hub.