倾斜圆管内超临界RP-3流动换热特性数值研究

In order to obtain the effects of inclination on flow and heat transfer characteristics of supercritical RP-3, numerical study in inclined tubes with a four-species surrogate model of RP-3 and LS low Reynolds number k-ε turbulence model was carried out. The results were compared with experimental data to guarantee the accuracy of numerical method. Wall temperature distributions of 45° inclined tube in longitudinal direction and circumferential direction were analyzed and two peaks were attributed to the secondary flow caused by buoyancy force and the thermal acceleration. When increasing the mass flux from 0.3g/s to 0.9g/s, the effect of buoyancy force weakened and the turbulence enhanced which resulted in the disappearance of two peaks. Different heat transfer regularities appeared at different angles from -90° to 90° on account of the distribution of buoyancy forces that's perpendicular to the flow direction and along the flow direction.