热科学学报（英文版）2005，Vol.14Issue(3)：198-205,8.
Influence of the Karman Vortex Street on the Broadband Noise Generated from a Multiblade Fan
Influence of the Karman Vortex Street on the Broadband Noise Generated from a Multiblade Fan
Souichi SASAKI 1Yoshio KODAMA 1Hidechito HAYASHI 1Makoto HATAKEYAMA2
作者信息
- 1. Mechanical systems engineering, Nagasaki University, 1-14 Bunkyo-machi Nagasaki City, 852-8521,Japan
- 2. Products R&D Laboratory, TOTO Ltd., 2-8-1 Honson Chigasaki City, 253-8577, Japan
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摘要
Abstract
In the prediction theory for the broadband noise generated from a multiblade fan, the vortices in the Karman vortex street was divided into n pieces. The frequency distribution of the noise was estimated so that the Strouhal number could become constant even if the wake is spread by the diffusion. From the results of the measurement of the internal flow of the fan, it was found that the noise was related to the wake characteristics of the specific location in the scroll casing where the relative flow velocity was high. The noise operating in the vicinity of the maximum efficiency point of the fan was distributed over the domain from 500 Hz to 1250 Hz. It was experimentally proved that the influence of the Karman vortex street on the noise in the domains of high and low frequencies did not exist when the distribution of the estimated sound pressure level corresponded to the measured broadband noise.关键词
aerodynamic acoustic/Karman vortex street/turbo machinery/blade/internal flowKey words
aerodynamic acoustic/Karman vortex street/turbo machinery/blade/internal flow分类
数理科学引用本文复制引用
Souichi SASAKI,Yoshio KODAMA,Hidechito HAYASHI,Makoto HATAKEYAMA..Influence of the Karman Vortex Street on the Broadband Noise Generated from a Multiblade Fan[J].热科学学报（英文版）,2005,14(3):198-205,8.
