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Impinging jet noise reduction using non-circular jets

机译：使用非圆形射流降低射流噪声

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摘要

Experimental studies in the acoustic far field and flow visualization are carried out on circular and non-circular impinging jets at a nozzle to plate distance ratio of 5, for the nozzle pressure ratios of 1.8, 4, and 6. Spectra and directivity of the overall sound pressure level of circular jets are compared with those of non-circular jets for the same nozzle pressure ratios, at various emission angles. Non-circular jets mitigate the transonic impinging tones at around the critical pressure ratio, compared to the circular jet. Square jet is quieter at low nozzle pressure ratios by 5-8 dB compared to the circular jet. At higher under expansion conditions, the triangular and square jets almost completely eliminate the supersonic impinging tones. Elliptical jet is noisy at a nozzle pressure ratio of 6, even compared to the circular jet. Elliptical minor axis plane is quieter at lower nozzle pressure ratios compared to the major axis plane and the trend is reversed for the higher nozzle pressure ratios. Schlieren flow visualization studies reveal that the shock cell structures are weakened and symmetry of the shock cells are lost for the non-circular jets compared to the circular jet. (C) 2018 Elsevier Ltd. All rights reserved.
机译：声学远场和流动可视化的实验研究是在喷嘴与板的距离比为5，喷嘴压力比为1.8、4和6的情况下，对圆形和非圆形撞击射流进行的。对于相同的喷嘴压力比，在不同的排放角度下，将圆形喷嘴的声压级与非圆形喷嘴的声压级进行比较。与圆形射流相比，非圆形射流可减轻临界压力比附近的跨音速冲击音。与圆形喷嘴相比，方形喷嘴在低喷嘴压力比低5-8 dB时更安静。在较高的膨胀条件下，三角形和正方形的射流几乎完全消除了超音速撞击音。与圆形射流相比，椭圆射流在喷嘴压力比为6时会很吵。与主轴平面相比，椭圆的短轴平面在较低的喷嘴压力比下更安静，并且趋势在较高的喷嘴压力比下则相反。 Schlieren流动可视化研究表明，与圆形射流相比，非圆形射流的激波单元结构减弱了，并且失去了激波单元的对称性。 （C）2018 Elsevier Ltd.保留所有权利。

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