关键词: 风洞;风扇;数值仿真;气动性能;噪声;优化设计

Abstract: Fan is one of the core parts of the aero-acoustics wind tunnel section.Performance of the fan including aerodynamic efficiency and acoustics noise has a major impact on the wind tunnel energy consumption and background noise of the test section.To obtain the optimization design parameters of the stator,details of the result were given about characteristics of fan section in 0.55m×0.4m low turbulence aero-acoustics wind tunnel by numerical simulation.Conclusion could be made that numerical methods used could give rational results by comparing with experiment data.Based on flow around rotor and stator,the flow mechanism inside fan section was analyzed.Different fan models were studied based on the numerical results.These parameters imposed influence on performance and flow mechanism of fan including the distance between rotor and stator,stator swept and leaned.Stator swept has little influence on pressure rise of fan section,and can minish tangential velocity at exit.Stator leaned significantly reduces or eliminates rotor wake and tip separation,and can produce a more uniform velocity profile at exit.Conclusions state the importance and feasibility of CFD in aero dynamical design of fan section in wind tunnel.

Key words: Wind tunnel;Fan;Numerical simulation;Performance;Noise;Optimized design