超临界压力下航空煤油水平管内换热特性数值模拟

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中图分类号：V430 文献标志码：A 文章编号：1671-8755（2025)03-0100-09

Numerical Simulation of Heat Transfer Characteristics of Aviation Kerosene in Horizontal Tubes under Supercritical Pressure

YANG Lei，MA Guolu，LI Liangchao， ZENG Guoying，CHEN Yu (School of Manufacturing Science and Engineering,Southwest University of Science and Technology,Mianyang 621o1o,Sichuan，China)

Abstract：A simulation study was conducted on the heat transfer characteristics of supercritical aviation kerosene ina horizontal tube to address the direct impact of the cooling effct of the combustion chamber temperature on the thermal protection efficiency and performance of the aircraft engine. The effects of pipeline parameters，heat flow density and mass flow rate on the heat transfer efficiency of the horizontal tube were analyzed，and the mechanisms of changes in the walltemperature，Nusselt number，and convective heat transfer coeffcient of the horizontal tubewere revealed.Theresults show that for horizontal pipes with diameters of 1.50，1.75，and 2.00mm ，the convective heat transfer coefficients are linear with the tube length within 600mm ，and the heat transfer performance of the small tube diameter （1.5 mm）is outstanding in the high temperature region due to the increase of the turbulent kinetic energy and the volume expansion efect in the later half of the tube length under the condition of Reynolds numberof 3 500.However，the total flow rate is limited by the cross-section size，and it is necessary to weigh the flow rate limitation and temperature uniformity demand.When the pipe diameter ratio is less than 250, there is a linear negative correlation between diameter ratio，convective heat transfer coefficient and heat flow density；When the diameter ratio is greater than 25O，diameter ratioand convective heat transfer coefficient folow a parabolic mapping relationship.The inner wall temperature has a localized peak at diameterratio of 5O,but theoverall temperature rises slowly with the tube diameter ratio，which is mainly regulated by the heat flow density. When the mass flow rate increases from 200 to 500kg/(Ωm2⋅s) ，the convective heat transfer coefficient increases by about 30%-50% ，and the turbulence enhancement suppresses the buoyancy effect， which reduces the temperature diffrence between the upper and lower walls, and the competition mechanism between the nonlinear variation of the physical properties of aviation kerosene and the buoyancy dominates the heat transfer efficiency. This study reveals the regulation law of key parameters on the heat transfer characteristics of supercritical aviation kerosene in horizontal pipelines, providing valuable references for investigating convective heat transfer mechanisms in hydrocarbon fuels.

Keywords: Aviation kerosene;Supercritical pressure ;Heat transfer characteristics;Numerical simulation

自20世纪60年代以来，超临界流体的流动与换热特性研究一直是能源领域的重要课题，并广泛应用于航空航天、核反应堆等领域[1-3]。（剩余16217字）