超临界压力下正癸烷在水平矩形冷却通道内的流动传热数值模拟

doi:10.7527/S1000-6893.2018.22297

Abstract

Abstract: In order to examine the effect of buoyancy on conjugate heat transfer of hydrocarbon fuel flowing in horizontal rectangular scramjet-engine cooling channels at different locations, a numerical simulation of conjugate heat transfer of n-decane under supercritical pressure is carried out. The influence and its mechanism of buoyancy on temperature and wall heat flux distribution in cooling channels at different locations are emphatically discussed and analyzed. Results indicate that the secondary flow caused by buoyancy has a significant impact on the distribution of temperature and wall heat flux in cooling channels at different locations. Buoyancy enhances the heat transfer capacity of n-decane flowing in rectangular engine cooling channels, and the heat transfer performance of n-decane in the cooling channels with the same heating direction and direction of gravity is improved the most. The modified Jackson&Hall empirical heat transfer expression is not applicable for heat transfer prediction of n-decane at supercritical pressures with consideration of buoyancy effect and therefore it is necessary to find other empirical formulas or to use the CFD method to solve this problem.

Key words: supercritical pressure, active cooling, buoyancy, hydrocarbon fuel, heat transfer enhancement

CLC Number:

V511⁺.6

ZHANG Zhuoyuan, HUANG Shizhang, GAO Xiaowei. Numerical simulation of heat transfer of n-decane under supercritical pressure in horizontal rectangular cooling channels[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018, 39(12): 122297-122297.

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Numerical simulation of heat transfer of n-decane under supercritical pressure in horizontal rectangular cooling channels

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