Frequency Analyses for Mechanism Research of Unsteady Flow Inside Three Dimensional Compressor Cascade  

作　　者：Sheng Zhou Hongbin Wu Xinqian Zheng 

机构地区：[1]Beijing Univ Aeronaut & Astronaut, Natl Key Lab Aircraft Engine, Beijing 100083, Peoples R China

出　　处：《Journal of Thermal Science》2004年第3期207-212,共6页热科学学报（英文版）

摘　　要：Numerical simulations are carried out for unsteady flow field of certain kind of 3D compressor cascade. Emphasis is laid on vortex shedding and frequency analysis in a compressor cascade. Numerical simulations using unsteady Reynolds-averaged viscous turbulent equations are carried out. The results show that the flows in separated areas and wake areas are characterized as periodic or quasi-periodic vortex shedding and the frequencies of vortex shedding vary with incidences and Mach number. At the same Mach number, the frequency of vortex shedding will decrease as the incidence increases. Yet, the frequency will increase as the Mach number increases at the same incidence. In the same computation case, the frequency of vortex shedding will vary along the span of blade. The frequency is smaller at the middle of the span than that at the hub.Numerical simulations are carried out for unsteady flow field of certain kind of 3D compressor cascade. Emphasis is laid on vortex shedding and frequency analysis in a compressor cascade. Numerical simulations using unsteady Reynolds-averaged viscous turbulent equations are carried out. The results show that the flows in separated areas and wake areas are characterized as periodic or quasi-periodic vortex shedding and the frequencies of vortex shedding vary with incidences and Mach number. At the same Mach number, the frequency of vortex shedding will decrease as the incidence increases. Yet, the frequency will increase as the Mach number increases at the same incidence. In the same computation case, the frequency of vortex shedding will vary along the span of blade. The frequency is smaller at the middle of the span than that at the hub. Keywords axial flow compressor - cascade - unsteady flow - separated flow - frequency of vortex shedding CLC number TK474.8

关 键 词：axial FLOW COMPRESSOR cascade UNSTEADY FLOW SEPARATED FLOW FREQUENCY of vortex shedding. 

分 类 号：TH45[机械工程—机械制造及自动化]