超临界RP-3在Kagome点阵填充冷却通道内流动传热特性  

Flow and heat transfer characteristics of supercritical RP-3 in cooling channels filled with Kagome lattices

作　　者：万鸿宇 胡建新 徐熠熠 WAN Hongyu;HU Jianxin;XU Yiyi(Hunan Hongda Risheng Aerospace Power Technology Co.Ltd.,Changsha 410000,China;School of Mechanical Engineering and Mechanics,Xiangtan University,Xiangtan 411100,China)

机构地区：[1]湖南宏大日晟航天动力技术有限公司,长沙410000 [2]湘潭大学机械工程与力学学院,湘潭411100

出　　处：《固体火箭技术》2024年第5期701-710,共10页Journal of Solid Rocket Technology

基　　金：湖南省教育厅科学研究项目(07KZ|KZ08104)。

摘　　要：针对新一代超燃冲压发动机的换热需求,以超临界RP-3航空煤油为冷却剂,选用Kagome型点阵填充的冷却通道,通过数值模拟研究Kagome设置数量、流速及压强对流体流动、传热及压降特性的影响。结果表明,与光滑通道相比,给定工况下,增加Kagome数量可降低下壁面温度最多至40%,努塞尔数最高可达光滑通道的4.243倍;增大流速,Kagome通道的传热系数随之提高,同时也会产生传热恶化现象。在流动特性方面,流体冲击Kagome点阵产生旋涡及尾迹可以强化换热;肋柱导致通道截面积收缩,使得流速上升,也有利于换热;提高流速、增加Kagome数量会导致压强损失变大。To satisfy the heat exchange demands of the next-generation scramjet engines,supercritical RP-3 aviation kerosene was employed as coolant,with cooling channels integrated with varying quantities of Kagome lattices.The effects of setting Kagome number,flow rate and pressure on fluid flow,heat transfer and pressure drop characteristics were studied by numerical simulation.The results show that,compared with the smooth channel,increasing the Kagome number can reduce the lower wall temperature by up to 40%for a given condition,and the Nussell number can be up to 4.243 times of that of the smooth channel;increasing the flow rate,the heat transfer coefficient of the Kagome channel will be increased,and the deterioration phenomenon of heat transfer will be generated at the same time.In terms of flow characteristics,the vortex and wake generated by the fluid impact on the Kagome array can enhance the heat transfer;the ribbed columns cause the cross-sectional area of the channel to shrink,increasing the flow rate,which is also conducive to heat transfer;increasing the flow rate and Kagomes number results in a larger pressure loss.

关 键 词：超燃冲压发动机 主动冷却 Kagome点阵 对流传热 流动特性 压强损失 

分 类 号：V439[航空宇航科学与技术—航空宇航推进理论与工程]