气-液两相多循环爆轰声场特性

doi:10.12382/bgxb.2021.0496

摘要/Abstract

摘要： 多循环爆轰与单次爆轰所对应形成的爆轰声场存在明显区别，燃气射流对于多循环爆轰声场特征具有重要影响，为此开展了气-液两相多循环爆轰声场独特的指向性与时频域特性研究。在自由空间内搭建了基于80 mm直径爆轰管的单次和多循环爆轰实验系统并进行了测试分析。结果表明：多循环爆轰声场指向性呈现“心”形，最大值出现在45°方向，辐射角度30°范围内爆轰声场高频截止频率约为500 Hz；射流区域内燃气湍流抑制了45°辐射角度内爆轰声波高频成分，明显减小了爆轰声波峰值声压级；燃气射流使得前导激波波阵面在中心轴线附近会产生“葫芦状”凸起，导致轴向0°方向爆轰声波到达时间明显小于其他方向；较短的脉冲作用时间导致多循环爆轰声效率高于传统射流声效率，达到12%。实验验证了燃气射流区域尺寸、辐射角度与多循环爆轰声场声波高频截止频率之间的相互关系。

关键词: 多循环爆轰, 脉冲声波, 指向性, 时频域, 燃气射流

Abstract: Acoustic distribution in the external flow field of a multi-cycle pulsed detonation tube is quite different from that in a single-cycle detonation flow. The detonation jet has an important influence on the acoustic characteristics in a subsequent cycle. The analysis of unique directivity and features in both time and frequency domains are presented in this paper. An acoustic experiment is performed on the detonation system for both single-cycle and multi-cycle using a 80mm detonation tube in free space. Result shows that the high frequency component in the detonation sound within the angle of 45° would be suppressed due to turbulence in the jet region. Severe attenuation of sound pressure peak in this region results in the formation of heart-shaped directivity patterns with a highest SPL at 45°. The relationship between jet diameter, angle and cut-off frequency is established, revealing a cut-off frequency of about 500 Hz within 30°. The detonation jet causes a gourd-shaped projection in the shockwave front near the axis, significantly reducing propagation time. The acoustic efficiency of the multi-cycle detonation is about 12%, greatly higher than that of a conventional jet.

Key words: multi-cycledetonation, impulsesoundwave, directivity, timeandfrequencydomains, gasjet

中图分类号:

V231.2

黄孝龙，李宁，康杨，翁春生. 气-液两相多循环爆轰声场特性[J]. 兵工学报, 2022, 43(10): 2621-2630.

HUANG Xiaolong, LI Ning, KANG Yang, WENG Chunsheng. Acoustic Characteristics of Gas-Liquid Multi-Cycle Pulsed Detonation Tube[J]. Acta Armamentarii, 2022, 43(10): 2621-2630.

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