曲面反射装置对脉冲爆轰发动机外流场影响的数值模拟

doi:10.12382/bgxb.2022.0261

摘要/Abstract

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。

关键词: 脉冲爆轰发动机, 爆轰噪声, 曲面反射装置, 反射波

Abstract:

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.

Key words: pluse detonation engine, detonation noise, curved surface reflector, reflected wave

康杨, 李宁, 黄孝龙, 张君善, 翁春生. 曲面反射装置对脉冲爆轰发动机外流场影响的数值模拟[J]. 兵工学报, 2023, 44(7): 1966-1977.

KANG Yang, LI Ning, HUANG Xiaolong, ZHANG Junshan, WENG Chunsheng. Numerical Simulation of the Effect of Curved Surface Reflectors on the External Flow Field of Pulse Detonation Engine[J]. Acta Armamentarii, 2023, 44(7): 1966-1977.

图/表 10

图1 两相PDE轴对称计算模型

Fig.1 Two-phase PDE axisymmetric computational model

表1 计算结果与理论C-J爆轰参数的对比

Table 1 Comparison of computational results and C-J theoretical values

参数	理论C-J值	计算值	相对误差/%
压力/MPa	1.89	2.01	6.35
波速/(m·s^-1)	1792.7	1630.3	9.06

图2 网格无关性验证结果

Fig.2 Grid independence validation

图3 PDE出口压力计算结果与实验结果对比

Fig.3 Comparison of computational and experimental results

图4 PDE外流场不同时刻压力云图

Fig.4 Pressure contours of PDE external flow field

图5 不同反射装置计算模型

Fig.5 Computational models of three reflectors

图6 加装椭球型反射罩的PDE不同时刻压力云图

Fig.6 Pressure contours of PDE with ellipsoidal reflector

图7 加装抛物线型反射罩的PDE不同时刻压力云图

Fig.7 Pressure contours of PDE with parabolic reflector

图8 加装圆锥型反射罩的PDE不同时刻压力云图

Fig.8 Pressure contours of PDE with conical reflector

图9 不同观测点处的压力-时间曲线

Fig.9 Pressure histories at different monitoring points

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