粗糙圆管内超临界航空煤油湍流换热特性分析

Supercritical flow and heat transfer performance of aviation kerosene RP-3 in ribbed tubes

中文关键词: 超临界  航空煤油RP-3  人为粗糙元  强化传热

英文关键词: supercritical state  aviation kerosene RP-3  artificial roughness  heat transfer enhancement

中文摘要:

      给出了国产航空煤油RP-3的三组分热物性替代燃料模型。采用k-ε湍流模型结合增强壁面处理的方法对超临界压力下航空煤油RP-3在圆形粗糙冷却通道中的流动与换热过程进行数值研究。分析了粗糙元形状、高度以及间高比等因素对其超临界流动和传热特性的影响规律,探究了人为粗糙度强化超临界航空煤油换热的机理。结果表明,人为设置粗糙元能使壁面附近产生局部回流区和旋涡结构,强化煤油与受热壁面间的对流换热。通过合理布置粗糙元结构,能大幅降低圆形冷却通道的壁面温度,有效抑制航空煤油的超临界传热恶化现象的发生。

英文摘要:

      The flow and heat transfer characteristics of China kerosene RP-3 in an external uniform heating pipe under supercritical pressure were investigated. Effects of the shape, the height, and the ratio of distance to height of artificial roughness elements on the flow field and thermal performance of aviation kerosene were analyzed. Mechanism for heat transfer enhancement of artificial roughness was discussed. The calculated results indicate that the artificial roughness can induce local reflow and vortex, and thus enhance convective heat transfer between kerosene and heated wall. Reasonable arrangement of artificial roughness can significantly decrease the wall temperature of the tube, and suppress the heat transfer deterioration at the supercritical state.