Numerical Simulation Of The Detonation Wave

Pulse Detonation Engine (PDE) is a high-powered propulsive device which has attracted great attention from the Department of Defense in China as a new concept at the present time. The Deflagration-Detonation Transition (DDT) technology is the key technology for developing PDE. In this paper, the characteristic parameters, structures, propagating mechanisms and formation conditions of detonation wave have been investigated basically by the numerical simulation. Firstly, a one-dimensional unsteady compressible flow model for two gases is constructed in Eulerian coordinate system, on the basis of which program CULDESH is developed to simulate the characteristic parameters of steady detonation wave. Secondly, to investigate the effects of various operating conditions on the transition of deflagration to detonation, program CULDDT is developed based on a one-dimensional unsteady compressible flow model with chemical reaction in Lagrangian mass coordinate system. Finally, some pieces of proposals are brought forward to improve the experimental system according to the simulation results. The main achievements of this work are as follows: ? Program CULDESH is tested by analystic solutions and simulates the problems about shock wave and detonation wave successfully. It is shown that the method works well in practice, by which the parameters of shock and detonation can be predicted quickly and accurately. ? Program CULDDT is proved to be reliable and correct by comparing the computed data with experimental results of our pulse detonation engine model. ? Calculations of DDT are carried out successfully with the help of program CULDDT, by which several factors are found via comparison and analysis which play important roles in determining the distance of DDT. ? Based on analysing and studying the DDT numerical simulation, some measures are suggested to improve experimental system.