| Summary: | Under different gravity conditions, the buoyancy can influence different effects of regeneration cooling effect of aviation kerosene.The RNG <i>k</i>-<i>ε</i> turbulence three-dimensional model is established, which is verified by comparing the wall temperature obtained by other experiments and simulations under the same conditions.Aiming at the variation of temperature distribution, secondary flow velocity, convective heat transfer coefficient and turbulent kinetic energy induced by the buoyancy of the aviation kerosene RP-3 in the horizontal pipe under different gravity conditions, the effect of jet fuel buoyancy on the heat transfer flow is studied.The research results show that the increase of gravity can significantly increase the influence of buoyancy on convection, and the turbulent kinetic energy can increase the nonlinearly, and the convective heat transfer coefficient is significantly improved.When the gravitational conditions change, the secondary flow induced by buoyancy in the direction of gravity undergoes a complicated evolution.The convective heat transfer coefficient is firstly decreased, then increased, and finally decreased.When the temperature of aviation kerosene exceeds the supercritical temperature, the convective heat transfer coefficient is changed abruptly, which can cause the significant differences in the wall temperature.
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