MODELING UNSTEADY MONOPROPELLANT COMBUSTION WITH FULL CHEMICAL KINETICS

A numerical model has been developed to calculate the unsteady combustion of single ingredient monopropellants with imposed pressure and radiant heat flux oscillations. A complex multi-species gas phase chemical kinetics mechanism has been implemented. Competing condensed phase decomposition and surface evaporation reactions were included, as well as in-depth radiation absorption. The model has been applied to RDX combustion at one atmosphere mean pressure with an imposed sinusoidal pressure perturbation. The pressure coupled response function and acoustic admittance function were calculated. Comparison was made with traditional quasi-steady pressure coupled response (ZN approach). A high frequency peak was observed and attributed to unsteady gas phase effects.

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