基于双向耦合的燃烧室与冷却通道的传热研究

In order to investigate the heat transfer characteristics of regenerative cooling channels and scramjet combustors, a two-way weak-coupling iterative calculation method is adopted. The combustor settings and cooling channel impacts on heat transfer and N-decane pyrolysis were studied numerically using this information. The findings indicate that the burning region and the high-temperature area will move rearward when the equivalency ratio increases. When the equivalence ratio reaches 0.75, part of the high-temperature zone moves out of the combustion section and the cooling channel cannot effectively cool the combustor. Therefore, the limitation of cooling channel should be considered in the design of equivalence ratio of the combustor. Moreover, a larger fuel injection angle leads to an ascent of the average temperature of the wall. The cracking rate at the outlet of the cooling channel increases from 8% to 11% as the injection angle increases from 30° to 75°. The combustor's temperature can drop by up to 200 K as a result of improving the coolant's heat absorption capacity through increased operating pressure in the cooling channel and coolant flow.