Three-dimensional Structures in Hypergolic Ignition Process and Flame-holding Mechanisms for Hydrazine/Nitrogen Dioxide Un-like Doublet Impinging Gas Jets
Hydrazine (N_2H_4)itrogen dioxide (NO_2) un-like doublet impinging gas jets were simulated to explore the hypergolic ignition processes in a N_2H_4/N_2O_4 bipropellant thruster. The three-dimensional compressible Navier-Stokes equations with a detailed chemical kinetics mechanism, in which more than 200 chemical reactions were directly taken into account, were solved. To investigate the influence of induction time of the chemical reaction on the three-dimensional flow field, we examied the differences in the three-dimensional structures of the hypergolic ignition process and flame-holding mechanism between the two inlet gas temperatures of 400 and 600 K. The computed results clarify that the ignition time of the impinging gas jets can be significantly influenced by the ignition delay of the detailed chemical kinetics mechanism. In addition, intermittent multi-ignitions play a significant role in the flame-holding mechanism.
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