Abstract
The three-dimensional simulation under consideration is related to the supersonic combustion of hydrogen with oxygen. The application under study corresponds to the early phase of ignition in a rocketlike engine. The configuration is a sonic jet of hot burned gases underexpanding into a combustion chamber filled with gaseous hydrogen. Two- and three-dimensional simulations are performed to assess the numerical strategy, define the mesh requirements, and to assist in the choice of the kinetic scheme for hydrogen/oxygen combustion. The large-eddy simulation tool is used with a reduced chemistry (five species and three global steps) on a mesh resolution fine enough to use the laminar model assumption (, 680 million points). The Pope criterion and a subgrid-scale Damköhler number are provided with various definitions for the Damköhler number to validate the retained procedure for three-dimensional simulations. The sequence of ignition is detailed, revealing the flame behavior and shock arrangements. A diffusion flame develops in the supersonic mixing layer formed by the igniter flow and hydrogen injections. The flame structure is recovered with a counterflow flame configuration. A comparison with a nonreacting case shows that the driving physical mechanism is mainly linked to the aerodynamics of the igniter jet.
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