Combustion Simulation of 82-Injector Rocket Engine

What is it about?

A computational study of the nonlinear rocket-engine combustion instability is presented for an engine with 82 coaxial methane-oxygen injector ports, a choked nozzle, and a combustion chamber. Computations use a three-dimensional unsteady k−ω shear-stress transport delayed detached-eddy simulation method. Four different chemical kinetic rates are simulated. When the normalized kinetic rate is one, only the longitudinal-mode instability is observed. As the kinetic rate decreases, the tangential-mode instability occurs and the longitudinal-mode instability becomes weak. The proximity of the domain of major heat release to the longitudinal mode pressure anti-node is found to be critical.

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