爆震波在多分叉管内连续传播机理

Detonation branching is an ignition method that transmits the energy of an existing detonation through a branching tube to a second thrust tube, providing a high-energy ignition pulse. In multi-tube PDE used detonation branching as the ignition source, detonation wave would continuously propagate from one tube to the next until arriving back at the first tube and repeating the process, and is thus termed a continuous branching PDE. But until now，the mechanism of detonation wave transmition in multi-tube are ambiguity, and the effect of complex wall on detonation paramaters is indistinct. A new simplified model was bulid in this work and composed of two branching tube and two detonation tube. The process of detonation waves transmit in multi-tube could be modeled if the inlet boundary is set to be periodic. Based on this model, the detonation transmition character with different branching tube could be described in numerical simulations and experiments. Also, the mechanism of detonation propagation and stengthen in complex tube could be described. Fianally, four PDE tubes were built in tail-to-tail or head-to-head. And a liuqid fuel was used in this experment to actualize an auto-ignition process. We try to make this system work under multi-cycle condition and realize a continuous branching PDE.

分叉管起爆技术可以克服脉冲爆震发动机（PDE）严重依赖大功率脉冲点火单元的缺点，并提供很高的点火能量。连续的分叉管脉冲爆震发动机（Continuous Branching PDE）将是一个新的发展方向。然而爆震波在多管内连续自持传播的机理尚不明确，复杂壁面对爆震波特性的影响也不清楚。本项目提出了一个简化模型，该模型由两根分叉管和两根主爆震管组成，如果将模型的进口边界设定为循环边界，那该模型可以完整的描述出爆震波在多分叉管内的传播过程。以此简化模型为基础，通过数值模拟和实验相结合的方法，可以获得不同分叉管构型下爆震波的传播特性，了解爆震波在复杂管内维持可自持传播或者增强的机理。最后本项目拟建立一个通过多分叉管相连的四管并联系统，采用液态燃料，并实现其自点火的过程，为脉冲爆震发动机的连续工作状态提供良好的理论和技术基础。