Study on heat transfer of supercritical RP-3 in rectangular channel by asymmetric heating
To optimize aircraft engine design,the Realizable k-e turbulence model was employed to investigate the flow and heat transfer processes of aviation kerosene RP-3 in a rectangular channel.The mechanisms were analyzed by which asymmetric heating to affect heat transfer.Analyzing the effects of asymmetrical heating on flow and heat transfer mechanisms were specifical-ly focused.Based on the distribution of the density,specific heat capacity and secondary flow in channel cross-section,the cause of heat transfer deterioration during asymmetric heating was further explained through the evolution of gas-like film tem-perature gradient and intense secondary flow.The results indicate that the heat transfer effect of top wall heating in the regenera-tive cooling channel is better than that of the bottom wall heating.On the one hand,because of the principle of heat flux redistri-bution,what is more significant is the influence of buoyancy and gas-like film effect.Buoyancy induces strong secondary flows,causing distortions in the flow and temperature fields.This results in an uneven circumferential thickness of the film-like layer,isolating the heated wall from the core cold fluid and exacerbating heat transfer deterioration.The proposed heat transfer correla-tion has an error margin within±20％,making it suitable for heat transfer studies of aviation kerosene in rectangular channels.
Supercritical aviation keroseneRegenerative coolingAsymmetricSecondary flowGas-like film effect
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