摘要
为研究多管脉冲爆轰发动机爆轰噪声传播过程及声波物理特性,对单管至四管脉冲爆轰发动机爆轰噪声物理特性开展实验研究,获得了多管脉冲爆轰发动机爆轰噪声的波形、声压衰减规律、辐射特性、持续时间和频谱特性等物理参数。结果表明:在管口区域,爆轰噪声峰值衰减较快,在远离管口区域,衰减速率逐渐放缓。随着爆轰管数量的增加,爆轰峰值噪声在各方位角上的声压级逐渐增大。在远场区域内爆轰噪声指向性图呈"M"形。随着爆轰管数量的增加,爆轰噪声的A/B持续时间均增加。爆轰噪声是能量主要集中在中低频段的宽频噪声,其频谱峰值和峰值所在频点随爆轰管数量的增加而改变。
The experimental system of multi-tube pulse detonation engine with single tube to four tubes is set up to study the formation of detonation noise and acoustic characteristics of multi-tube pulse detonation engine.The physical parameters of multi-tube detonation noise,including waveform,attenuation of sound pressure,radiation characteristics,duration and acoustic spectrum characteristics are obtained.The results show that the peak sound pressure of detonation noise attenuates faster in the area near the tube exit,and the attenuation speed in the area far away from the tube exit is inversely proportional to the radius distance.With the increase of the number of detonation tubes,the peak sound pressure level of detonation noise at each directivity angle increases gradually.In the far-field region,the directivity of the detonation noise is M-shaped.As the number of detonation tubes increases,the A/B duration of detonation noise increase.The acoustic spectrum of detonation noise is a broadband signal,and the acoustic energy mainly concentrates in the range of middle and low frequency.The dominant spectrum peak and sound pressure level of the acoustic spectrum vary with the increase of the number of detonation tubes.
作者
黄孝龙
李宁
翁春生
HUANG Xiaolong;LI Ning;WENG Chunsheng(National Key Laboratory of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094)
出处
《声学学报》
EI
CAS
CSCD
北大核心
2021年第3期415-422,共8页
Acta Acustica
基金
中央高校基本科研业务费专项项目(30919011258)
江苏省自然科学基金青年基金项目(BK20190439)资助。
作者简介
通信作者:李宁,lining@njust.edu.cn。
