Numerical Simulation On Flow And Heat Transfer Characteristics Of Hydrocarbon Fuel Active Cooling Under High Heat Flux

The aerocraft cooling problem has already become more important along with the increasingflight Mach number. Kerosene is not only the fuel of the scramjet, but also a cooling medium of itsimportant components, hence the cooling performance is very important. So the research of the flowand heat transfer characteristics of kerosene is significant for active cooling system design ofhypersonic vehicle.Firstly, Daqing RP-3aviation kerosene under high heat flux is selected for study. Numericalsimulation and theoretical analysis were carried out to study heat transfer characteristics of kerosenein pipe under high heat flux with fully considering the phase transition endothermicity and the thermalcracking endothermicity, by using the CFD software Fluent in this paper. In order to simulate the heattransfer characteristics of kerosene under different heat flux, the evaporating space and the fictitiousboiling were used. And the effects of pressure, flow rate, inlet temperature and other factors on heattransfer of kerosene were analyzed respectively.Secondly, three-dimensional heat transfer model of regeneratively cooled scramjet wasdeveloped. The flow and heat transfer characteristics of different sizes of kerosene cooling channelstructure were studied through numerical simulation. Ensuring the same flow rate of kerosene toconduct research on the size of the cooling channel. At last the correlation between geometry ofcooling channel structure and the heat transfer characteristics was analyzed. The results can provide areference for the design of the regenerated active cooling channel.Finally, the Kerosene-air heat exchanger unit body were numerically simulated and investigatedby the software Fluent. In order to compile the heat flux changes along the wall, the dates of heat fluxwere extracted from the wall of the exchanger first, and then the wall boundary conditions of singlepipe were set by using UDF. The heat transfer characteristics of kerosene were researched underphase changing in a pipe. The thermally protection method of wall material was proposed.The results of this study can provide a reference for high heat flux exchanger design andthermally protection of components under similar thermal environment.