Application of hydrogen chemical reaction mechanism in numerical simulation of supersonic combustion
The applicability of the chemical reaction kinetics mechanism of hydrogen combustion to supersonic combustion is studied for a supersonic combustion chamber with support plate configuration.After selecting suitable turbulence model and reaction model,the supersonic combustion flow field of 8 chemical dynamics mechanisms(5 detailed mechanisms and 3 simplified mechanisms)under the same working condition is studied.By comparing the simulation results of three turbulence models and two reaction models with the experimental data,it is found that the most reasonable choice of SST k-ω turbulence model and EDC reaction model is to simulate the flow field of the combustion chamber of the supported plate engine.By comparing the distribution of temperature,velocity,OH concentration and H2O mass fraction on the cross section of the combustion chamber flow field simulated by five detailed mechanisms,it is found that the OH concentration distribution in the results is quite different,and other parameters are not very different.The simulation results obtained by the simplified mechanism are compared with those obtained by the detailed mechanism,and it is found that the flame structure,flame temperature and the distribution of intermediate product OH obtained by the three simplified mechanisms are very different from those obtained by the detailed mechanism.
supported plate scramjet enginechemical kinetic mechanismhydrogensimplified mechanismnumerical model
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