高负荷轴流压气机叶栅二次流动与损失关联性探讨

Investigation on Relation Between Secondary Flow and Loss on a High Loaded Axial-Flow Compressor Cascade

关键词:  压气机  叶栅  二次流  损失

Key words:  Compressor  Cascade  Secondary flow  Loss

摘要:

为探讨压气机中二次流与损失生成的关联性，对一高负荷轴流压气机叶栅开展数值模拟研究。首先对叶栅流动进行定性分析，在此基础上推导定量模型估算流场中的损失源，并由此获得二次流动诱发损失的机理与影响。研究结果显示，在大部分攻角范围内，二次流诱发的损失未超过50%。相对于二次流间接作用于低速流而诱发的损失而言，其直接耗散产生的损失仅为小量；在角区失速时的详细观测也显示，通道横流的流向变化，也即二次流对低速流间接影响的变化是导致通道内损失随攻角激增的主要原因。

Abstract:

Numerical investigation was carried out to study the relation between secondary flow and loss generation in a high-loaded compressor cascade. Based on a series of qualitative analysis，a new quantitative analysis model has been derived further to attain the loss contribution of various sources，and the mechanism and effects of secondary flow on loss generation were finally conformed. The results show that loss due to secondary flow does not exceed 50% under a wide range of inlet attack angles. The indirect effect of secondary flow on low speed region is identified to dominate its contribution to loss with its direct dissipating remaining small magnitude order. A detailed research about the mechanism of the steep loss increase near corner stall also indicates that change in direction of cross flow，which is the change of indirect effect of secondary flow on low speed region， is mainly responsible as the incidence increases.