Abstract
A good understanding of the flow dynamics and the flame stabilization mechanism in a liquid rocket engine is essential for the development of high-performance liquid rocket engines. The current work attempts to improve the understanding of LOX/CH4 combustion dynamics at conditions similar to contemporary liquid rocket engines. Three-dimensional Large-Eddy Simulation (LES) of LOX/Methane combustion in a shear coaxial injector is performed, focusing on the identification of the flame stabilization mechanism of the non-premixed LOX/Methane flames at supercritical conditions. The flamelet and the flamelet/progress-variable approaches are considered. Extreme caution is exercised to improve the numerical accuracy of the dual-time stepping preconditioning scheme to ensure that the primary quantities in the governing equations are indeed conserved at locations where the typical density ratio is up to 100. The mixing and the flame dynamics at supercritical conditions in the vicinity of the shear coaxial injector are studied. The flame anchoring/lift-off and the corresponding mechanisms are also systematically studied.
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