Effect of Particle Injection Velocity on Aluminum Powder/air Two-phase Rotating Detonation Waves
The effect of particle injection velocity on the two-phase flow field of a rotating detonation engine fueled by aluminum powder and air is studied. The two-dimensional rotating detonation combustion for the aluminum particles with the injection temperature of 300 K and the high temperature air with the total inflow temperature of 900 K is simulated by using the discrete phase model,one-step surface reaction including kinetic/diffusion-limited rate surface combustion model and multiple-step gas phase decomposition reaction model and considering the devolatilization of incompletely unburned particles. Results show that the particle injection velocity near the inlet is lower than that of air,which results in an incomplete overlap between the air triangle and the particle triangle. As the particle injection velocity increases from 1 m/s to 100 m/s,the detonation velocity and temperature first decreases and then increases. There is a significant temperature difference between particles and air injected into the combustion chamber,which leads to unstable detonation wave propagation. The detonation wave has the best stability when the particle injection velocity is 70 m/s.
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