曲面反射装置对脉冲爆轰发动机外流场影响的数值模拟  

Numerical Simulation of the Effect of Curved Surface Reflectors on the External Flow Field of Pulse Detonation Engine

作　　者：康杨[1] 李宁[1] 黄孝龙[1] 张君善 翁春生[1] KANG Yang;LI Ning;HUANG Xiaolong;ZHANG Junshan;WENG Chunsheng(National Key Laboratory of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China;School of Equipment Management and Support,Engineering University of People's Armed Police,Xi'an 710086,Shaanxi,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 [2]武警工程大学装备管理与保障学院,陕西西安710086

出　　处：《兵工学报》2023年第7期1966-1977,共12页Acta Armamentarii

基　　金：瞬态物理重点实验室基金项目(6142604210203、6142604200202);江苏省自然科学基金资助项目(BK20220919);陕西省自然科学基金项目(2021JM-253);武警工程大学基础研究课题(WJY202147);中央高校基本科研业务费专项资金项目(30919011258)。

摘　　要：为探索能够有效抑制脉冲爆轰发动机工作时产生的大功率爆轰噪声向发动机头部关键部位传播的技术途径,采用时空守恒元与求解元方法对加装椭球型反射罩、抛物线型反射罩和圆锥形反射罩三类反射装置的发动机出口流场进行数值模拟。研究结果表明,反射装置旋转面的反射特性差异造成三类反射装置对爆轰噪声的作用效果不同。椭球型反射罩将反射波汇聚到反射罩的轴线方向;抛物线型反射罩将反射波近似平行向下游汇聚;圆锥形反射罩不能产生滞后于直达波的反射波,反射波加强了直传波并一道向下游传播。To explore a technical way to effectively suppress the propagation of high-power detonation noise generated by a pulse detonation engine to the key parts of the engine head,the external flow field of pulse detonation engine equipped with three kinds of reflectors,which are ellipsoidal reflector,parabolic reflector and conical reflector,are numerically simulated by using the space-time conservation element and solution element method.The results show that the three types of reflectors have varying effects on the detonation noise due to their distinct reflection characteristics onthe rotating surface.The ellipsoidal reflector converges the reflected wave towards the axis of the reflector.The parabolic reflector approximately parallelizes the reflected waves downstream,whilethe conical reflector does not produce the reflected wave lagging behind the direct wave,which strengthens the direct wave and propagates downstream together.

关 键 词：脉冲爆轰发动机 爆轰噪声 曲面反射装置 反射波 

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]