带有根部间隙的压气机静子通道流场测量

Measurement of Flow Field in Stator Passages of a Compressor with Hub Gap

为了研究静子根部间隙对压气机性能的影响,设计了4支不同长度的"L"形五孔探针和1支四孔探针。通过位移机构移动上述探针,对某双级低速轴流压气机在不同流量工况下的5个不同轴向位置的静子通道截面流场进行了实验测量。实验结果表明,在最大流量和近失速工况下,根部间隙引起的泄漏流和叶尖处的角区分离流与主流的掺混始终是造成静子通道内总压损失的主要原因。随着进口流量的减小,泄漏流和角区分离的起始位置将更靠近通道进口。

In order to study the effect of stator hub gap on performance of the compressor, four ＂L＂ type five--hole probes with different lengths and a four--hole probe were designed. The three-- dimensional flow field at five sections in the stator passages of a two--stage axial compressor was measured with those probes,driven by a displacement mechanism. Results show that mixing of leakage flow and corner separation is the main cause of loss in stator passages. As inlet flow decreases the initial position of leakage flow and corner separation will be closer to the passage inlet.