压气机中尾迹/边界层作用模型的分析与验证

基于叶轮机中尾迹的负射流效应,考虑了边界层外缘黏性力项对边界层发展的影响,推导了尾迹/边界层相互作用的数学模型,并建立了边界层动量厚度与压气机叶片负荷变化的定量关系,对模型进行了数值模拟和实验验证.结果表明:①此模型能够较好地预测尾迹通过频率对压气机负荷的影响,压气机压升随着尾迹通过频率的变化存在极大值;②尾迹引起边界层当地压力梯度变化,是影响压气机负荷的主要因素. 

Analysis and verification of wake / boundary layer interaction model in compressor

A wake/boundary layer interaction model was derived based on negative jet effect of wake transport in turbomachinery, which contains the outer boundary layer viscous force on boundary layer development . Then a relationship between pressure rise and momentum thickness was established. An experiment was designed to verification this model about effect of wake passing frequency on compressor pressure rise at fixed wake depth and wake width. Comparsion of model and experimental results indicated that: 1) the model can be used to predict the effect of wake passing frequency on compressor pressure rise effectively; 2) the key factor of wake/boundary interaction is local pressure gradient that changs with wake, which inflect pressure rise finally.