基于环形喷管的脉冲爆轰发动机爆轰声波声学特性  

Acoustic Characteristics of Pulse Detonation Engine with Annular Nozzle

作　　者：康杨[1] 李宁[1] 黄孝龙[1] 翁春生[1] KANG Yang;LI Ning;HUANG Xiaolong;WENG Chunsheng(National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094,Jiangsu,China)

机构地区：[1]南京理工大学瞬态物理国家重点实验室,江苏南京210094

出　　处：《兵工学报》2022年第5期1075-1082,共8页Acta Armamentarii

基　　金：瞬态物理国家重点实验室基金项目(6142604210203、6142604200202);江苏省自然科学基金青年项目(BK20190439);中央高校基本科研业务费专项资金项目(30919011258)。

摘　　要：喷管结构对爆轰发动机性能和爆轰声波声学特性具有重要的影响。为探究环形喷管作用下脉冲爆轰声波的声学特性,基于脉冲爆轰发动机搭建了自由空间内爆轰声波实验系统,针对环形喷管作用下爆轰声波时频域特性、声场指向性和持续时间等声学特性进行实验研究。结果表明:在该实验条件下,环形喷管改变了爆轰声波的能量分布,对爆轰声波的声学特性有重要的影响;环形喷管作用下的爆轰声波在0°方向的上升沿持续时间最长;90°方向上峰值声压最高,衰减速度最快,衰减幅度最大;爆轰声波呈现出明显的90°方向凸出的指向性;爆轰强声的A持续时间随着传播角度的增大而逐渐减小。The nozzle has a significant influence on the performance of detonation engine and acoustic characteristics of detonation acoustic wave.An acoustic wave experimental system is constructed in free space to explore the detonation acoustic wave characteristics of pulse detonation engine with annular nozzle,and the acoustic characteristics of pulse detonation engine,such as time-frequency domain characteristics,sound field directivity and duration,are measured and analyzed.The experimental results show that the annular nozzle changes the energy distribution of detonation acoustic wave and has the significant influence on detonation acoustic characteristics.The rising duration of detonation acoustic wave in 0°direction is relatively longer.The peak sound pressure of pulse detonation engine in 90°direction is the highest,and its attenuation speed and amplitude are the largest.The detonation acoustic wave radiates the most energy in 90°direction.The a duration of detonation acoustic wave of pulse detonation engine decreases with the increase in propagation angle.

关 键 词：脉冲爆轰发动机 爆轰声波 环形喷管 声学特性 

分 类 号：V235.22[航空宇航科学与技术—航空宇航推进理论与工程]