Numerical Simulation And Experimental Study Of Pulse Detonation Engine With Series Ignition Initiation Method

Pulse detonation engine is a new type of power device which generates thrust by periodic detonation wave and that has advantages of simple structure,high thermal efficiency and high reliability.How to improve the working frequency is a hot issue in the research of pulse detonation engine.In this paper,by using primary formed in the head of steady detonation wave has the characteristics of high temperature and high pressure,and the ignition is carried out the secondary tube.The results show that in series mode of ignition can be effectively shorten the distance of DDT(Deflagration to Detonation Transition).This ignition mode could achieve rapid initiation in the secondary tube.Finally,achieve the purpose of improving the working frequency of engine.In this paper,numerical simulation and experimental research on pulse detonation engine with the influence of series ignition were studied and analyzed.Main contents are as follows:(1)The mathematical model of two-dimensional/axial symmetry detonation of the first main tube was established,and using two dimensional inviscid CE/SE method to calculation the detonation process in this tube.Numerical results have shown that:Under the condition ofopen position remain unchanged,if the diameter of the opening is larger,will cause the bigger disturbance of the flow field in the main detonation tube.In the connection pipe keep the premise of blasting what should try to narrow the joint area in order to reduce the impact on the flow field of detonation tube.(2)The mathematical model of one-dimensional detonation of bifurcation tube was established,using the inlet boundary conditions to couple with the first main tube,and the one dimensional inviscid CE/SE method was used to calculate the detonation process in bifurcation tube.By comparing calculation with high temperature and high pressure ignition mode and diffraction of detonation waves ignition mode.Numerical results have shown that:diffraction of detonation wave ignition can effectively shorten the distance and time of DDT.(3)The mathematical model of two-dimensional/axial symmetry detonation of secondary main tube was established,and using two dimensional inviscid CE/SE method to calculation the detonation process in second main tube.Numerical calculate obtains influence of different pipe diameter ratios and different coupling modes on the detonation process of the secondary tube.(4)The experimental platform of pulse detonation engine was designed and built,the engine fuel and oxidant were hydrogen and oxygen,the detonation wave propagation process in bifurcation tube was studied.The propagation mechanism of detonation wave in bifurcation tube was defined.The influence of different filling conditions and spoiler of detonation in bifurcation tube were analyzed.Through the above research of numerical and experimental,the variation of the flow field in the engine during the single cycle was defined.Compared to the traditional ignition method,using the series ignition initiation mode can effectively improve engine operation frequency that is beneficial to the engineering application of the pulse detonation engine.