脉动喷气发动机噪声特性研究

doi:10.3969/j.issn.1000-1093.2017.02.010

摘要/Abstract

摘要： 为了研究脉动喷气发动机噪声特性，搭建了Helmholtz型脉动喷气发动机噪声试验测试系统。对不同管长的脉动喷气发动机管外，不同距离、不同角度处发动机噪声进行了测量。试验结果表明：脉动喷气发动机噪声呈现周期性、低频性的特点；脉动喷气发动机噪声基频由其工作频率决定，噪声的基频成分对总噪声的贡献值最大；随着传播距离的增加，脉动喷气发动机噪声声压级逐渐减小，其衰减幅度略大于球面波衰减规律，不同角度处的噪声衰减规律几乎一致；不同传播距离处的噪声呈现出相同的轴向指向性；随着脉动喷气发动机尾喷管长度的增加，其噪声声压级及基频均随之降低，但尾喷管长度的增加对其噪声指向性没有影响。

关键词: 兵器科学与技术, 脉动喷气发动机, 噪声特性, 衰减规律, 指向性

Abstract: The noise characteristics of a Helmholtz-type pulsejet engine are experimentally studied. In the experiment, the length of tailpipe is changed from 680 mm to 1 280 mm at every 200 mm interval. The noise of pulsejet engine is measured at different distances and different angles from the exit of tailpipe. The experimental results show that the noise of pulsejet engine has the characteristics of periodicity and low frequency. The noise fundamental frequency of pulsejet engine is determined by its working frequency. The fundamental frequency component of noise is the largest proportion of the total noise. As the propagation distance of noise increases, the sound pressure level decreases. The attenuation amplitude of noise is slightly larger than that of the spherical wave. The noise attenuation laws of noise at different angles are almost identical. The directivities of noise at different propagation distances are same. The highest noise pressure appears in the direction of 0°. With the increase in length of tailpipe, the sound pressure level and the fundamental frequency decrease. However, the directivity of noise isn’t changed. Key

Key words: ordnancescienceandtechnology, pulsejetengine, noisecharacteristic, attenuationlaw, directivity

中图分类号:

V235.22⁺1

康杨，翁春生，李宁. 脉动喷气发动机噪声特性研究[J]. 兵工学报, 2017, 38(2): 273-279.

KANG Yang, WENG Chun-sheng， LI Ning. Research on Noise Characteristics of Pulsejet Engine[J]. Acta Armamentarii, 2017, 38(2): 273-279.

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