气动谐振管内压力振荡数值计算

为了研究气动谐振管内的加热现象,采用二维轴对称Euler方程组和显式MacCormack格式对谐振管内的非定常振荡流场进行了数值模拟.针对不同压力的驱动气体进行了计算,得到了谐振管底端压力振荡时间历程以及谐振管内其它气动参数的变化规律,确认了谐振管内的压力振荡是由于激波和膨胀波交替进出谐振管引起的,而且与驱动气体的压力相关.计算所得的谐振管底端压力振荡曲线与实验结果相一致,表明了所采用的数值方法对分析谐振管内的振荡流动过程是适用的.

Numerical Investigation of Pressure Oscillation in Gas Dynamic Resonance Tube

For studying the heating phenomenon in the gas dynamic resonance tube, the two dimensional axisymmetrical Euler equations and the explicit MacCormak scheme were used to simulate the non stationary flow field in a resonance tube. Calculations were done for the driving gas of different pressures. Pressure oscillating histories and distributions of other flow parameters in the resonance tube were obtained. The calculated results confirm that the inflow and outflow of traveling shock waves and expansion waves by turns in the resonance tube results in the pressure oscillation, and the pressure oscillation is related to the pressure of the driving gas. Agreement of the calculated pressure oscillating curves with experimental results suggests that the employed numerical method is valid in modeling the resonance flow process.