涡流
回流
物理
机械
涡流环
消散
轴流压缩机
旋涡脱落
起动涡流
泄漏(经济)
气体压缩机
经典力学
湍流
热力学
机械工程
工程类
宏观经济学
雷诺数
经济
入口
作者
Jiexuan Hou,Yangwei Liu
出处
期刊:Physics of Fluids
[American Institute of Physics]
日期:2023-04-01
卷期号:35 (4)
被引量:19
摘要
The evolution of unsteady vortex structures in the tip region of an axial compressor rotor is investigated based on delayed detached eddy simulation. The vortex structures are identified by the L T cri method, and the velocity fields are visualized by the particle tracing method. The results show that the evolution of the tip leakage vortex (TLV) can be divided into three phases: the generation phase, the development phase, and the dissipation phase. The unsteadiness of the flow field mainly appears in the dissipation phase as a consequence of the unsteady secondary tip leakage. There are three primary unsteady vortex structures caused by the tip leakage flow (TLF), and these vortex structures are related to each other as a feedback loop. The intermittent formation of the vortex ropes leads to the breakdown of the TLV and thus results in the roll-up of the backflow vortex (BFV) due to the radial velocity gradient. The secondary leakage of the BFV locally enhances the TLF jet and affects the formation of the vortex ropes in turn. This feedback loop causes the unsteady behavior of the TLF and has great impacts on the performance and stability of the compressors.
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