新型激波聚焦脉冲爆震模型连续起爆探究

A Study of Continuous Initiation for a New Shockwave Focus Pulse Detonation Model

针对俄罗斯Levin等人提出的2-Stage PDE模型中射流径向入射导致连续爆震工作无法顺利完成的问题,计算模型基于Fluent软件进行了仿真实验,通过改变环形射流入射方向的手段实现有效且快速地填充。在模型结构上,通过采用高频低能耗火花塞预点火、渐缩通道、环形窄缝和环形弯面,强化形成环形爆震波入射,并经衍射后实现激波聚焦起爆。凹面腔结构实现了循环时间为9.1ms,填充时间为7.6ms,工作频率为109Hz快速有效填充和高频起爆。

Aimed at the problem that continuous detonation caused by the jet radial incidence focusing structure fails to successfully complete in the detonation model of 2-Stage PDE proposed by Levin et al,an efficient and rapid filling by changing the incident direction of annular jet is made based on the simulation conducted by FLUENT software.Through the use of high frequency and low energy consumption spark plug pre ignition,tapered channel,annular narrow slot and annular curved surface,the annular detonation wave incidence is enhanced,and the shockwave focusing initiation can be realized in the concave cavity after diffraction.The result shows that the single cycle time of the concave cavity structure is 9.1 ms,the filling time is 7.6 ms,and the working frequency is 109 Hz.