Numerical simulations on effect of equivalence ratio on flow field in aluminum power/air rotating detonation engines
The flow field of a gas-solid two-phase rotating detonation engine taking aluminum powder as fuel and air as oxidant with one step reaction was investigated by two-dimensional numerical simulations at different equivalence ratios.Results showed that the velocity of the detonation wave decreased from 2 070 m/s to 1 690 m/s and detonation pressure decreased from 5.67 MPa to 4.87 MPa when the equivalence ratio increased from 0.6 to 1.4,because the average local equivalence ratio increased from 0.929 to 2.093,which was caused by incomplete overlapping of trigonal zones between air and particles because of the injection velocity difference between air and particles.The flow field was similar to that in gas phase rotating detonation engines.However,unique distribution characteristics,including two particle groups,four particle bands and gaps among them due to the interaction between gas phase and solid phase,were obtained.
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