多孔形低騒音弁の減音の効率化に関する研究 : 第1報,超音速多孔平行噴流の減音特性

概要

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The acoustic characteristics of multiple supersonic jets discharged through a multihole plate have been studied over a range of pressure ratio up to 7, for the purpose of understanding the noise suppression mechanisms and developing acoustically improved multihole valve trim. The effects of multihole configuration (hole size, number of jets, and lateral spacing between holes), are investigated in close relation to the flow behavior by far-and near-field noise measurements and schlieren photography. The acoustic efficiency η, is found to decrease in a power law correlation to the diameter of small hole, and with an increase in the number of jets at high pressure ratios. These trends are discussed from the viewpoint of the noise spectrum modification and an acoustic shielding concept. The lateral spacing mainly affects the relatively low-frequency noise radiating from the downstream merged jet.
一般社団法人日本機械学会の論文
1988-04-25