Investigation Of Heat Transfer Characteristics Of Hydrocarbon Fuel In U-shaped Rotating Channel

The regenerative cooling is an effective thermal protection method for cooling a high-speed aircraft by using a hydrocarbon fuel as a working medium,and can be applied to the cooling of a high-pressure turbine.Based on this background,this paper analyzes the flow and heat transfer characteristics of hydrocarbon fuels in a U-shaped channel under rotating conditions,and explores the characteristics and heat transfer characteristics of hydrocarbon fuels in rotating tubes under supercritical conditions,and studies the working conditions and pipelines.Influence of Structural Parameters on Flow and Heat Transfer in Rotating Pipelines of Hydrocarbon Fuels.This paper first establishes a numerical model for the flow and heat transfer of supercritical hydrocarbon fuels in a rotating cooling channel.The k-? SST turbulence model is used for computational studies.Firstly,the influence of rotational speed on the flow and heat transfer of hydrocarbon fuel in the U-shaped channel under constant working conditions was studied.Under the rotating condition,Coriolis force influences the flow,generates the channel vortex,and at the same time,the rotation energy improves the overall heat transfer effect of the rotating pipe.Finally,the heat exchange capacity between the hydrocarbon fuel phase and the air is compared,and it is found that the hydrocarbon fuel has obvious advantages.Then,the effects of flow parameters,heat flux,pressure,and other operating parameters on the heat transfer of hydrocarbon fuel in the rotating cooling channel were studied by means of control variables.The results show that the greater the flow rate,the better the heat transfer effect,but the smaller the flow conditions at high speeds,the better the overall performance of heat exchange;heat flux becomes larger,the heat transfer ability becomes worse,but the flow resistance becomes smaller,the overall performance of heat transfer Better;the lower the pressure,the better the heat transfer performance under rotating conditions.Finally,the rotating U-channel model with different cross-sectional shapes and different chord lengths is established in this paper,and the influence of these structural parameters on flow and heat transfer is studied.The results show that the cross-sectional shape will affect the number of eddy currents in the rotating channel.The best heat transfer effect of the circular tube is at the low rotation speed.The AR2:1 scheme has better comprehensive heat transfer performance at high rotation speeds.According to the study of chord length,it is found that the heat transfer effect of the chord length is good in the 5D range,and the heat transfer performance is not enhanced after exceeding 5D.This paper studies the general heat transfer law of rotating U-shaped channels,provides technical and data support for further in-depth research and rotary cooling channel design,and has good scientific research and application value.