低肋与V形肋复合结构在双通道中的强化换热数值研究  

Numerical Study on Heat Transfer Enhancement of the Two-pass Channel by Low Rib and V-shaped Rib Composite Structures

作　　者：王涛[1,2] 张强[1,2] 单怡璠[1,2] 宋克伟[1,2] 李海龙 武祥[1,2] WANG Tao;ZHANG Qiang;SHAN Yifan;SONG Kewei;LI Hailong;WU Xiang(School of Mechanical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Key Laboratory of Railway Vehicle Thermal Engineering,Ministry of Education,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学机电工程学院,兰州730070 [2]兰州交通大学铁道车辆热工教育部重点实验室,兰州730070

出　　处：《兰州交通大学学报》2024年第5期139-148,共10页Journal of Lanzhou Jiaotong University

基　　金：国家自然科学基金(52266003);兰州交通大学重点研发项目(ZDYF2302)。

摘　　要：随着燃气轮机内涡轮入口温度的升高,燃气轮机会出现热障问题,为保证燃气轮机安全运行,复合结构能够有效提高通道的冷却性能来解决此问题。采用SST k-ω湍流模型对带有低肋与V肋复合结构双通道的流动与传热特性进行了数值模拟,将圆形肋复合结构、扇叶形肋复合结构和葫芦形肋复合结构与纯V形肋在雷诺数为10 000~60 000时的传热性能进行比较,探索出综合换热效果最佳的复合结构。发现相比于纯V形肋通道,复合结构双通道的综合传热性能均得到提升,其中葫芦形肋与V形肋组成的复合结构的综合换热效果最好。葫芦肋复合结构的Nu相比于纯V形肋提高了4.33%~6.6%,f提高了0.04%~4.48%,η最佳值达到了2.13。葫芦形肋复合结构的η比45°斜方形肋和45°斜花形肋分别增大了25.51%~32.98%和4.73%~10.51%,同时,低肋与V形肋组成的复合结构综合换热性能要优于凹坑与V形肋组成的复合结构。葫芦肋复合结构有效增强通道的换热效果且压力损失增长较小,可显著提升涡轮内部冷却通道的综合换热性能。The increase of inlet gas temperature will lead to security problem of turbine blades.To ensure the safe operation of gas turbines,the composite structure is an effective way to enhance the cooling performance of the channels to solve the problem.The SSTk-ωturbulence model is chosen to numerically simulate the flow and heat transfer characteristics of the two-pass channel.The thermal performance of the circular rib composite structure,the fanshaped rib composite structure,and the calabash rib composite structure are compared with the solely V-shaped rib at Re of 10000to 60000,aiming to explore the rib structure with the best heat transfer effect from the three composite structures of the turbine blade.The investigation concludes that the thermal performance of the composite structures augmentable compared the pure V-shaped rib.The best thermal performance is the composite structure of the calabash rib.The Nuof the calabash composite rib increases by 4.33~6.6%compared to the solely V-shaped rib,the calabash rib composite structure fis larger by 0.04~4.48%compared to the solely V-shaped rib,and the calabash composite structure freduces by 3.67~5.21%compared to the fan rib composite structure.It concludes that the thermal performance index(η)of the composite structure is enhanced compared to the channel with solely V-shaped rib.The composite structure of calabash rib has the best thermal performance index,and the maximum value ofηreaches 2.13.Theηof the calabash rib composite structure is increased by 25.51~32.98%and 4.73~10.51%compared to 45°oblique square ribs and 45°oblique petal-shaped ribs,respectively.And the composite structure with low ribs and V-ribs has a significantly higher thermal performance than the composite structure with dimples and V-ribs.The proposed composite structure of calabash rib has great potential to enhance the thermal hydraulic performance of the cooling channel for gas turbine blade.

关 键 词：涡轮叶片 冷却 V形肋 复合结构 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]