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The paper represents 3D mathematical model of conjugated heat exchange in the cooling systems of the aviation ramjet engines. The systems use cooling capacity of the turbulent endothermic fuel flows in heated curvilinear rough channels surrounding the combustion chamber. Simplest one-step model based on substitution of the real hydrocarbon substances by some fictitious medium is used for description of thermal decomposition of the endothermic fuels. The one-step pyrolytic reaction mechanism describes the fictitious medium decomposition without intermediate reactions. In addition to the standard model based on the Navier-Stokes equations, the mathematical model includes a partial differential equation for computation of a local decomposition degree of the fictitious medium in curvilinear channels to avoid computation of residence time. Energy equation has an extra source term describing the endothermic effect of the hydrocarbon substance pyrolysis. The paper represents results of the numerical experiments with pentane under supercritical pressure as the endothermic fuel.

NUMERICAL SIMULATION OF THE CONJUGATE HEAT TRANSFER IN THE COOLING SYSTEM OF THE COMBUSTION CHAMBERS OF THE AVIATION RAMJET ON THE ENDOTHERMIC FUELS