PIV Investigation of Complex Eddy Viscosity Model Based on Reynolds Stress-Strain Spatial-Phase Lag for Low-Speed Axial Fan


Y.X.Jia 1,N.Jiang 1,2 1 Dept.of Mechanics,School of Mechanical Engineering,Tianjin University,Tianjin 300072,China 2 Tianjin Key Laboratory of Modern Engineering Mechanics,Tianjin 300072,China


An experimental study is presented to investigate the predictive performance of a complex eddy viscosity model(EVM) based on Reynolds stress-strain spatial-phase lag in simulating the flow physics pertinent to a low-speed forward-swept axial fanusing time-resolved particle image velocimetry(TRPIV).The data is processed to yield the time evolution of velocities,Reynolds stresses and strain rates by use of the spatial phase-averaged method.The spatial-phase lag relationship between Reynolds stresses and mean rates-of-strain is found,so the studied complex EVM will be considered as a promising closure for improving the state-of-the-art of industrial computational fluid dynamics(CFD) by accounting for non-equilibrium effects.


axial fan,blade,Reynolds stress,rate-of-strain,complex eddy viscosity model


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