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。
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 frequen- cy. 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 an- gles are almost identical. The directivities of noise at different propagation distances are same. The high- est noise pressure appears in the direction of 0°. With the increase in length of tailpipe, the sound pres- sure level and the fundamental frequency decrease. However, the directivity of noise isn＇ t changed.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2017年第2期273-279,共7页
Acta Armamentarii
基金
国家自然科学基金项目(11372141
11472138)
国防预先研究基金项目(9140C300205140C30137)
装备预先研究基金项目(9140C300202120C30)
江苏省普通高校研究生科研创新计划项目(KYZZ16_0176)
中央高校基本科研基金项目(30920140112011)
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
ordnance science and technology
pulsejet engine
noise characteristic
attenuation law
di-rectivity
作者简介
康杨（1992-），男，博士研究生。E-mail：vince-kang@126．com
翁春生（1964-），男，教授，博士生导师。E-mail：wengcs@126．com
