横向爆震射流起爆爆震过程的数值模拟

Simulation of transverse detonation jet initiation process

对氢气/空气化学恰当比混合物中横向喷射的爆震射流在爆震室中起爆爆震波的过程和机理进行了数值模拟,并探讨了爆震射流位置和填充速度对其的影响。结果表明:爆震波分叉传播后会发生衍射并衰减,但随后可在联焰管壁面产生高温高压区域,引发二次起爆。且联焰管距离爆震室推力壁越小,其形成的壁面效应越有助于爆震形成;填充速度越大,爆震波形成位置越靠前。

In order to investigate the influence of jet position and filling velocity on transverse detonation jet initiation, the process with different jet position and different filling velocity are simulated. Stoichiometric hydrogen-air mixture is used. The results indicate that diffraction emerges when detonation wave splits from a PDE tube, but secondary initiation may occur subsequently due to high temperature and high pressure region around crossover tube wall. Minishing the distance between thrust wall and jet position and augmenting the filling velocity may accelerate detonation initiation.