Study of porous tubes as a noise suppressor (2nd report. Experimental study on the effects of the shroud and other parameters)

被引：0

作者：

Seto, Kunisato

Matsuoka, Muneharu

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来源：

Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B | 1988年 / 54卷 / 504期

关键词：

Noise Abatement;

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摘要：

In order to increase the noise-reducing effect of a porous tube, we investigated the change in the acoustic characteristics due to the variation of porosity, the diameter of the aperture and the porous pattern of the tube. We found that the noise-reducing characteristics are changed by the attachment of a shroud to each porous tube especially in the range of low pressure ratios. We showed the preferable combination of a porous tube and shroud to effectively reduce the noise level for a variety of pressure ratios. Furthermore, we discovered experimentally that the combination of a shroud and porous tube can increase the thrust (momentum) of the jet flow through it, especially in the range of higher pressure ratios.

引用

页码：2061 / 2066

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