Investigation on relation between secondary flow and loss on a high loaded axial-flow compressor cascade

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.