Numerical Study Of Convective Heat Transfer Characteristics Of RP-3Aviation Kerosene Flowing In A Rectangular Cooling Channel At Supercritical Pressure

The supercritical hydrocarbon fuel as a renewable coolant is a key and effective thermal protection technology in the areas of hypersonic cruise missiles, hypersonic aircrafts and space planes. So there is very important academic significance and application value of engineering to make research on flow and heat transfer of supercritical hydrocarbon fuels.In this article, we select the RP-3aviation kerosene to be the working fluid, and we apply the fluid calculation software FLUENT6.3to make numerical simulations on flow and heat transfer characteristics of RP-3aviation kerosene in a rectangular cooling channel at supercritical pressure. The distribution of velocity field and temperature field in the channel was analyzed. Influence of heat flux, pressure, inlet temperature and geometry on flow and heat transfer was investigated.The computational results indicate that using the RNG κ-ε model in FLUENT6.3which combines with the enhanced wall treatment method can accurately predict flow and heat transfer characteristics of the supercritical RP-3aviation kerosene in the rectangular cooling channel. The violent variation of the thermo-physical properties of the fluid leads to the decline of heat transfer coefficient and the deterioration of heat transfer when the bulk temperature close to the pseudo-critical temperature. Decreasing the heat flux, increasing the pressure, decreasing the inlet temperature or increasing the mass flow rate can all enhanced heat transfer in the cooling channel at supercritical pressure. As the cooling channel height/width aspect ratio increases, heat of the heating wall will not transfer to the upper part of the side wall, and the upper part of the fluid in the cooling channel will not participate in the cooling process, which will lead to the reduction of the heat transfer effect. And as the channel aspect ratio increases, the effect of heat transfer will drop after the first enhancement. It can get better effect of flow and heat transfer when the supercritical RP-3aviation kerosene flow in a square cooling channel.