| 阻塞喷注冲击噪声的离散谱特性 |
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| 引用本文： | 王佐民. 阻塞喷注冲击噪声的离散谱特性[J]. 声学学报, 1982, 7(5): 310-314. DOI: 10.15949/j.cnki.0371-0025.1982.05.005 |
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| 作者姓名： | 王佐民 |
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| 作者单位： | 中国科学院声学研究所 |
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| 摘 要： | 本文研究了中φ20mm收缩喷口、压力比在2.05至3.95之间的阻塞喷注冲击噪声的频谱特性,离散频谱的基频频率与压力比的关系和离散频谱的远场指向性;提出了通过测定离散频谱的远场指向性来确定冲击波第一气室到喷口的距离S和涡旋运行速度Vc与喷注速度VJ的比值N的方法。并求得,N=0.49—0.74（平均为0.61）。
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| 收稿时间： | 1981-04-01 |
THE CHARACTERISTICS OF SCREECH SPECTRA IN CHOKED JET NOISE |
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| WANG Zuo-min. THE CHARACTERISTICS OF SCREECH SPECTRA IN CHOKED JET NOISE[J]. ACTA ACUSTICA, 1982, 7(5): 310-314. DOI: 10.15949/j.cnki.0371-0025.1982.05.005 |
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| Authors: | WANG Zuo-min |
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| Abstract: | In this work, the characteristics of sound spectra in chocked jet noise are studied. We derived the relation of the first frequency in screech spectra to pressure ratios, and the directivity of the screech spectra in far field. In our experiment, a convergent nozzle with diameter 20 mm was used and the pressure ratio from 2.05 through 3.95 was taken. A new method which estimates the distance 8, from the first cell to the nozzle, and the ratio N of vortex convection velocity Vc to jet velocity Vc was found, based on the directivity of screech. The values of N obtained in this work are 0.49-0.74 (average 0.61), in good agreement with that obtained in low Mach number by other. authors. |
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