The key of combustion simulation is the turbulence and chemical reaction modeling. Chemical reactions influence the temperature distribution in the combustor greatly. A three-dimensional numerical simulation of a strut-cavity-based supersonic combustor was carried out using three different chemical reaction mechanisms of kerosene, namely the one-step, the two-step and the 31-step chemical reactions. The predicted static pressure distributions along the combustor walls are compared with experimental data and effects of chemical kinetic mechanisms on combustion have been analyzed. Results show that the best agreement between computation and experiments is obtained by the two-step reaction, validating its effectiveness and availability in the current model combustor. In the one-step and 31-step reaction calculations, obvious discrepancies are found near the isolator inlet because the over-predicted heat released from the reaction process leads to thermal choking near the front struts, thus the combustor can no longer work properly. The heat release depends on the reaction rates for the three reaction mechanisms.
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