In this study, the effect of a velocity-pulsating stoichiometric hydrogen-oxygen mixture entering an expanding combustion chamber on the detonation wave is investigated. The hybrid sixth-order weighted essentially non-oscillatory centered difference scheme was used to solve the Navier–Stokes equations with a one-step two species chemistry model. The results verify that the induction zone is extended under the influence of pulsating flow. The discontinuous structure is formed in the flow field. A lot of unburned jets between the wavefront and the reaction zone were generated, which resulted in insufficient energy release. Coupled with the weakening of the wave strength by the Prandtl–Meyer (P-M) expansion fan, the detonation wave show different degrees of attenuation. The decay of the detonation wave shows different patterns at different amplitudes and periods. When the velocity amplitude is $0.3V_{CJ}$, the decay rate of detonation wave increases with the increase of the disturbance period. This attenuation law is different from the amplitude of $0.1V_{CJ}$ and $0.2V_{CJ}$. This is because the discontinuous structure area formed by high-amplitude disturbance is large. Therefore, the longer its existence time is, the more serious the detonation wave attenuation is.

在这项研究中，速度脉动的化学计量氢氧混合物进入膨胀燃烧室对研究爆轰波。混合六阶加权基本非振荡中心差分方案用于通过一步二种化学模型求解 Navier-Stokes 方程。结果验证了诱导区在脉动流的影响下扩大。在流场中形成不连续结构。波前与反应区之间产生大量未燃射流，导致能量释放不足。再加上普朗特-迈耶（PM）膨胀扇对波强的减弱，爆轰波表现出不同程度的衰减。爆轰波的衰减在不同的振幅和周期表现出不同的模式。当速度幅值为$0.3V_{C杰}$，爆轰波的衰减率随着扰动周期的增加而增加。这种衰减规律不同于振幅$0.1V_{C杰}$和$0.2V_{C杰}$. 这是因为高振幅扰动形成的不连续结构区域较大。因此，其存在时间越长，爆震波衰减越严重。