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| Research of Aerodynamic Noise Source in Tip Region of Axial Fans with Circumferential Skewed Blades at Off-Design Conditions |
| JIN Guang-Yuan-1, 2 , 欧Yang-Hua-1 , HU Bin-Bin-1, WU Ya-Dong-1, DU Chao-Hui-1 |
| (1. School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. School of Mechanical Engineering, Jiangnan University, Wuxi 214122, Jiangsu, China) |
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Abstract Aerodynamic noise source generated by tip leakage flow in circumferential skewed axial fans was studied by CFD simulation and experiments under offdesign conditions. Relationship between tip leakage flow and aerodynamic noise was analyzed based on vortexsound theory of low speed homentropic flow. Synergy between acoustic source and tip leakage vortex was discussed. Pressure test on casing wall and acoustic far field test were conducted to find how the different circumferential skewed direction control acoustic characteristics. The results show that the acoustic source generated by tip leakage vortex of circumferential skewed blades is an important noise source under offdesign conditions. The angle between velocity vector and vortex vector controls the strength and the distribution of the acoustic source in tip clearance region. The acoustic source in tip clearance region is related with the acoustic far field under offdesign conditions.
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Received: 26 March 2010
Published: 29 June 2011
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