Hump-Shaped Broadband Noise on a Fan at Off-Design Conditions

作     者：Manuel Henner Francois Franquelin Bruno Demory Youssef Beddadi Charles Roland Aurelien Serran 

作者机构：Valeo Thermal Systems 8 rue Louis Lormand ZA de l 'Agiot La Verriere 78321 Frances. 

出 版 物：《Journal of Mathematics and System Science》 (数学和系统科学（英文版）)

年 卷 期：2015年第5卷第9期

页      码：376-384页

摘      要：A spurious effect of blowing noise is sometimes detected on fans working at high flow rate, showing a large hump around 4000 Hz on the acoustic spectra. A Tollmien-Shlichtling (TS) effect is suspected, and several compressible LES are made on aerodynamic profiles to detect and investigate this phenomenon. Vortex shedding is observed at the trailing edge, triggering some density fluctuations when a thin boundary layer exists on the profile upper side. Acoustic waves with length equivalent to the chord are observed. A profile modification is proposed with a camber brought closer to the leading edge. This shape tested on a prototyped fan confirms the weakening of the TS effect.

主 题 词：设计条件 宽带噪声 风机 峰形 气动外形 旋涡脱落 文件修改 风噪声 

学科分类：082902[082902] 081704[081704] 07[理学] 08[工学] 0817[工学-轻工类] 0829[工学-安全科学与工程类] 070302[070302] 0703[理学-化学类] 

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