Simulation method of inter-stage bleeding of multi-stage axial compressor

Abstract

In order to demonstrate the feasibility of using the direct meshing method or the source term method for numerical study of inter-stage bleeding technology, two different three-dimensional simulation methods were compared here, which uses the direct meshing method to simplify the bleed air chamber, and then applies the influence of bleed air to the main flow path by meshing the bleed air chamber. While the secondary passage of bleed air was omitted in the source term method, and a certain bleed flow mass was applied to the bleed slot. The research results show that, due to the limitation of the calculation principle, the flowfield near the bleed slot is distorted by the source term method. It is impossible to predict the uneven bleed effect and partial overflow. Meanwhile, the flow coefficient of upstream of the bleed slot is increased by the source term method, leading to decrease or even over deflection of deviation of the upstream stator. However, due to the filtering effect of the upstream stator, the streamwise influence of the source term method is limited. If it is not necessary to study the local flow field upstream of the bleed slot, the source term method is sufficient to support the analysis of the influence of inter-stage bleed air on the overall characteristics of the compressor.