竖直圆管内超临界碳氢燃料换热恶化的直径效应

doi:10.7527/S1000-6893.2016.0037

Abstract

Abstract:

Numerical study of diameter effect of heat transfer deterioration of supercritical hydrocarbon fuel by using Fluent was conducted, LS low Reynolds turbulence model was used for turbulence modeling, and the physical properties of surrogate fuel of RP-3 were calculated according to extended corresponding state law. Computation conditions in this study are listed: the system pressure is 3 MPa, the inlet temperature is 573 K, the heat flux is 500 kW/m² and the mass flows are 0.001 5, 0.003 0 kg/s; the inner diameter ranges from 1 to 10 mm.The computation methods were proved to be accurate by good agreement between computed wall temperatures and experimental results under normal heat transfer. The results indicate that in the case of forced convection at low mass flow the heat transfer deterioration occurs more seriously and in more forward position with the larger diameter; the reason for heat transfer deterioration is that the specific heat is in sharp drop region after the maximum value, at high mass flow wall temperature is in positive proportion to tube diameter and there is no heat transfer deterioration occurring; the buoyancy effect works only in low mass flux cases and is enhanced with larger diameter; the criteria of the buoyancy effects working and the heat transfer deterioration boundary with tube diameters are given.

Key words: supercritical, hydrocarbon fuel, heat transfer deterioration, diameter, buoyancy

CLC Number:

V312+.1

CHENG Zeyuan, ZHU Jianqin, LI Haiwang. Diameter effect on heat transfer deterioration of supercritical hydrocarbon fuel in vertical round tubes[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(10): 2941-2951.

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Diameter effect on heat transfer deterioration of supercritical hydrocarbon fuel in vertical round tubes

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