气动谐振管加热振荡流动过程数值研究

Numerical investigation on gas dynamic resonance tube heating oscillating flow process

关键词:  谐振器  谐波振荡  气动加热  振荡流  数值仿真

Key words:  Resonator  Harmonic oscillation  Aerodynamic heating  Oscillating flow  Numerical simulation

摘要:

为了了解气动谐振管加热现象的振荡流动过程 ,利用显式TVD MacCormark格式数值求解二维轴对称雷诺平均N S方程 ,获得了一个谐振循环中完整的喷嘴 谐振管系统的振荡流动湍流流场。结果表明 ,欠膨胀声速冲击喷流固有的流场不均匀性和不稳定性是谐振管加热现象产生的内在原因 ,激波耗散是谐振管主要的加热机理。

Abstract:

To understand the oscillating flow process of the gas dynamic resonance tube heating phenomenon, the explicit TVD MacCormark scheme was used to numerically solve the two dimensional axis symmetrical Reynolds averaged N S equations. The flow fields of the complete oscillating turbulent flow field in one resonance cycle of the nozzle resonance tube system were obtained. The results show that the inherent non homogeneous structure and instability in the under expanded sonic impinging jet is the internal reason for the occurrence of the resonance tube heating phenomenon and the shock wave dissipation is the main heating mechanism.