Dependence of premixture jet height on detonation wave propagation inside a pressure gain combustion channel

Abstract

In the flow field of a rotating detonation engine (RDE), the detonation wave propagates through the reaction with the continuously injected fuel and oxidant mixture. In the previous research using the actual RDE, the detonation wave velocity generated in RDE is usually significantly lower than the characteristic Chapman-Jouguet wave velocity for the corresponding mixture due to insufficient mixing and other reasons. In this paper, construct a linear pressure gain combustion channel (PGCC) that simulates the RDE flow field. The effects of incomplete fuel and oxidizer mixture mixing on the propagation of detonation waves in the RDE flow field are studied through experiments and numerical analysis. For the research method, a plane detonation wave propagating in a normal state generated in another detonation tube is used to enter into the premixed fuel jet train inside PGCC. The schlieren method was used to measure the detonation wave propagation at different fuel heights, and the details were investigated by two-dimensional numerical analysis. The results show that the well-mixed fuel can still maintain the propagation of detonation under shallow supply pressure, and the detonation wave increases with fuel height.