基于多级设计概念的肋化内冷通道流动换热特性  

Fluid flow and heat transfer of ribbed channel based on the hierarchical design concept

作　　者：刘国庆 郑少飞 杨燕茹 李海旺[3] 王晓东[1,2] LIU Guoqing;ZHENG Shaofei;YANG Yanru;LI Haiwang;WANG Xiaodong(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;Research Center of Engineering Thermophysics,North China Electric Power University,Beijing 102206,China;School of Energy and Power Engineering,Beihang University,Beijing 100191,China)

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,北京102206 [2]华北电力大学工程热物理研究中心,北京102206 [3]北京航空航天大学能源与动力工程学院,北京100191

出　　处：《航空动力学报》2024年第10期274-282,共9页Journal of Aerospace Power

基　　金：航空发动机及燃气轮机基础科学中心项目(P2022-B-Ⅱ-029-001);国家自然科学基金(52006064)。

摘　　要：利用数值仿真方法,研究了4种肋片构型(直肋、斜肋、V肋和反V肋)和两种设计方法(均匀设计和多级设计)下肋化通道的流动换热特性,进一步明确多级设计概念的有效性和适用性。结果表明:采用多级设计后,4种肋片构型的换热性能均有不同程度的下降,其中直肋降幅最小(低于3.00%),斜肋降幅最大(达到12.76%);流动阻力展现出标志性的下降,其中直肋减阻效果最差,摩擦因子降低36.15%~37.67%,反V肋实现最佳的减阻效果,摩擦因子降低46.98%~50.32%;最终,多级设计有效地增强了肋化通道综合冷却效果,在雷诺数为100000时,与现有均匀设计相比,基于多级设计的反V肋综合性能因子提高81.29%。分析表明:沿着流动方向线性减少的肋片尺寸,一方面有效地抑制二次流动,另一方面促使主流产生下压效应,强化壁面流体冲击效果,进而在轻微损失换热性能的基础上,实现标志性的减阻效果。Using the numerical simulation,the fluid flow and heat transfer characteristics of a ribbed channel considering four rib configurations(transverse ribs,inclined ribs,V-shaped ribs,and inverse Vshaped ribs)and two designs(uniform design and hierarchical design)were studied for verifying the effectiveness of the hierarchical design concept.The results demonstrated that using the hierarchical design,the heat transfer performances of four kinds of ribs slightly decreased,the transverse rib had a minimum reduction below than 3.00%,while the inclined rib presented a maximum reduction up to 12.76%;the flow resistance was significantly reduced,the transverse rib had a minimum reduction with the decreased friction factor by 36.15%—37.67%,the inverse V-shaped rib had a maximum reduction with the decreased friction factor by 46.98%—50.32%;as a result,the hierarchical design effectively improved the overall cooling performance of the ribbed channel with a reduction of 81.29%for the inverse V-shaped rib at Reynolds number of 100000.The slight reduction of the heat transfer performance and the marked resistance reduction came from the combination of the constrained secondary flows and the lowering effect of the mainstream.

关 键 词：涡轮叶片内部冷却 多级设计概念 换热性能 流动阻力 综合性能 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]