The present study is concerned with numerical simulating of NOx formation in Helmholtz pulse combustor using thermal and prompt models. The influence of tailpipe friction coefficient, tail pipe length, inlet air temperature, equivalence ratio and heat transfer coefficient on the formation and emission of nitric oxide is investigated. A numerical method for time dependent equations of mass, momentum and energy is employed to modeling reactive flow field inside the pulse combustor. In addition, numerical results are compared with experimental results. The results show that decreasing wall temperature, inlet mass flow, inlet fuel mass fraction and inlet air temperature is leaded to lower NOx formation. Also NOx formation is decreased with increasing tailpipe length and heat transfer coefficient.

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