考虑压气机动静干涉效应的非设计工况性能数值模拟

1引言非定常流动是叶轮机械内部固有的本质属性,而现有的设计体系中不论是在设计或分析时基本上采用定常流动的假设,从而忽略了非定常流动对叶轮机械在气动、结构强度等方面的影响。目前,国内外对非定常流动的研究比较多,但其中采用非定常流动数值模拟方法预估压气机非设计工况

Numerical simulations of compressor off-design performances with rotor-stator interaction

The unsteady flow of rotor/stator interaction at off-design condition in axial compressor was investigated numerically. Quasi three-dimensional unsteady Navier-Stokes equations were solved with high-resolution scheme. Dual time-stepping approach in conjunction with LU-SGS implicit method was used to calculate the unsteady flow. The steady and unsteady performances at 100% ,90% and 80% design rotating speed respectively were presented. The computation showed that adiabatic efficiency values for steady flow is lower than that of unsteady flow. However, the calculated total-to-total pressure ratio is greater than the unsteady results. The numerical analysis showed that the stall margin can be determined by the unsteady computed results. The state is stable if unsteady surface pressure varies periodically with time, while it is unstable when the variations are not periodic.