氢氧爆轰波在变截面扩张管道中传播的数值模拟

采用二阶精度频散控制耗散格式(DCD)和8组分20个方程的基元反应模型,对轴对称变截面管道中氢氧爆轰波传播进行数值模拟。结果表明,爆轰波传播至突变截面扩张管道时,由于稀疏波的作用可能会使爆轰波局部熄爆甚至完全熄爆,对于某些敏感度高的反应气体爆轰波可以二次起爆。而在渐变截面扩张管道爆轰波相对不易熄爆。

Numerical simulation of hydrogen-oxygen detonation wave propagation in an expansion chamber

Propagation of hydrogen-oxygen detonation wave in an abruptly expanding chamber and a gradually expanding chamber was simulated by solving the axisymmetrical Euler equations. The dispersion- control dissipation scheme (DCD) and a detailed chemical reaction kinetics model with 8 sections 20 reactions were adopted. Numerical results indicate that in some cases detonation wave may quench when detonation wave front diffracts at the entrance of expanding chamber due to the extreme declination of temperature and pressure. The reinitiation was found in some cases depending on the sensitivity of detonation gas. Comparison shows that detonation wave is more inclined to quench when propagating in an abruptly expanding chamber than in a gradually expanding chamber.