0Numerical study on heat transfer deterioration of hydrocarbon fuel in transcritical process under influence of multiple influencing factors

In order to deeply understand the heat transfer characteristics of supercritical hydrocarbon fuel in the process of active regeneration cooling, the heat transfer characteristics of supercritical RP-3 were numerically calculated based on the open source software OpenFOAM. The SST(shear stress transport) k-ω turbulence model was used and the physical properties of aviation kerosene alternative fuels were calculated by the generalized corresponding state law. Comparative analyses between numerical and experimental results were used to evaluate the reliability of calculation method, the average error of wall temperature was less than 3% with the heat flux ranging from 300kW/m2 to 400kW/m2. The mechanism of heat transfer deterioration was analyzed, the effects of pressure, inlet temperature and the ratio of heat flux and mass flow rate on the flow and heat transfer were discussed. It indicated that the dramatic changes of hydrocarbon fuel physical properties near the pseudo critical temperature were the main cause of heat transfer deterioration under forced convection. Improving the pressure and the ratio of heat flux and mass flow rate or decreasing the inlet temperature were effective measures to avoid the heat transfer deterioration near the pseudo critical temperature. The predictive correlation formula of heat transfer deterioration had been proposed, providing a reference for the regeneration cooling technology.