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- Title
锯齿襟翼尾缘叶片对轴流风机气动噪声的影响.
- Authors
郑 楠; 叶学民; 胡佳密; 李春曦
- Abstract
A two-stage variable-pitch axial fan was taken as the research object, and the trailing edge structure of the toothed Gurney flap was adopted to optimize blades. The effect and mechanism of toothed flaps with different tooth lengths on fan performance, aerodynamic noise and internal dynamics were analyzed, and the original and modified fan performance was numerically calculated by using the Reynolds time-averaged control equations, k - ε turbulent model and large eddy simulation (LES). The results show that the toothed flap can greatly improve the fan performance, and the total pressure rise is inversely proportional to the tooth lengths. After utilizing toothed flap, the peak efficiency of the fan shifts to the large flow rate side, and the high efficiency region is widened. The toothed flap can significantly reduce the high frequency noise of fan by an average reduction of 13 dB. The toothed flaps significantly improve the structure of wake vortex of blade, lower the energy dissipation at the trailing edge of middle and root of blades, affect the reverse pressure gradient distribution in the wake, diminish the strength of the secondary recirculation flow in the vortex core, and then alleviate the aerodynamic noise of the fan. The toothed flap with the tooth length of 0. 8% chord presents the best comprehensive performance in improving efficiency, raising total pressure and reducing noise.
- Publication
Journal of Engineering for Thermal Energy & Power / Reneng Dongli Gongcheng, 2022, Vol 37, Issue 9, p50
- ISSN
1001-2060
- Publication type
Article
- DOI
10.16146/j.cnki.rndlgc.2022.09.006