总压总温组合畸变对压气机稳定性影响的数值模拟研究

本文对不同进口总压、总温组合畸变对压气机稳定性的影响进行了数值研究。计算模型以一维时间相关的气体欧拉方程组为基础,计及了压气机系统加功、气体抽吸和加热过程,并在计算中改进平行压气机理论的进出口假设,对一种双涵道压气机进行了三种周向总温、总压畸变组合形式的计算,给出了组合畸变情况下压气机稳定边界的变化。结果表明,在三种组合方式中,总压、总温畸变区域完全重合时压气机的稳定裕度损失最大,反之最小,部分区域重合时稳定边界介于前两者之间,且同时具有前两种情况的部分特征。

Effect on Stability of Compressor with Total Temperature and Pressure Distortions

Response of compressor to the inlet combined distortions of pressure and temperature is emphasized in this paper.The mathematic model used in the paper is based on the one dimensional and time dependant Eulerian equations,taking into account of the work applied by compressor system,air bleeding and heating processes.The inlet-outlet assumptions of parallel compressor theory are modified, and the effect of three circumferential combined distortion modes of the compressor is calculated.The changes in compressor stability boundary under distortion conditions are given.According to the calculated results,it could be concluded that among the three combined distortion modes discussed in this paper,if total temperature and total pressure are in the same area,the compressor's stability margin descends to the utmost;if they are in separated areas,the stability boundary descends least;if the areas are partially overlapped, the boundary decreasing amplitudes lie between the former two cases,and this condition also exhibits some of their characteristics.