透平叶片中弦区无气膜孔管网冷却数值模拟研究  

Numerical Simulation Study on Cooling of Film-hole-free Pipe Network Targeting the Mid-chord Region of Turbine Blades

作　　者：蔡扬 陈明敏 范小军 王蛟 CAI Yang;CHEN Mingmin;FAN Xiaojun;WANG Jiao(School of Energy and Power,Jiangsu University of Science and Technology,Zhenjiang,China,Post Code:212100;Shanghai Electric Gas Turbine Co.,Ltd.,Shanghai,China,Post Code:201100)

机构地区：[1]江苏科技大学能源与动力学院,江苏镇江212100 [2]上海电气燃气轮机有限公司,上海201100

出　　处：《热能动力工程》2024年第11期125-134,共10页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金青年基金项目(12302387);江苏省自然科学基金青年基金项目(BK20220650)。

摘　　要：针对叶片传统冷却方式冷却性能提升有限、冷气需求量大、换热不均匀等瓶颈问题,本文提出了针对叶片中弦区的新型无气膜孔管网冷却结构。采用数值模拟方法对比了管网冷却结构与典型含气膜孔的双层壁冷却结构的流动和换热特性,并进一步分析不同冷气进口雷诺数和温比对管网冷却性能的影响。结果表明:相较双层壁冷却结构该新型管网冷却结构表面平均温度低9.7 K,同时表面温度分布均匀性更好,体现了该管网冷却结构具有冷却性能好、冷气消耗量低和温度分布均匀的优点;随着冷气进口雷诺数从90000增至180000,管网冷却结构的叶片表面温度均降低64.4 K,整体换热性能明显变好;当温比由2.80下降至2.15时,叶片平均温度逐渐升高;管网冷却结构可大幅提升中弦区的冷却性能,但对前缘和尾缘提升不大,需要进一步优化内部冷却结构。In order to address the bottleneck problems such as limited cooling performance improvement of traditional blade cooling methods,large demand for cold air,and uneven heat transfer,a new air-free membrane pipe network cooling structure for the mid-chord region of blades was proposed in this paper.The flow and heat transfer characteristics of the pipe network cooling structure were compared with those of typical double-wall structures with gas film holes by numerical simulation method.And the effects of different cold air inlet Reynolds numbers and temperature ratios on the cooling performance of the pipe network were further analyzed.The results show that the average surface temperature of the new pipe network cooling structure is 9.7 K lower than that of the double-wall cooling structure,and the surface temperature distribution is more uniform,which shows that the cooling structure of the pipe network has the advantages of good cooling performance,low consumption of cold air and uniform temperature distribution.With the increase of cold air inlet Reynolds number from 90000 to 180000,the blade surface temperature of the pipe network cooling structure decreases by 64.4 K,and the overall heat transfer performance becomes significantly better.When the temperature ratio decreases from 2.80 to 2.15,the average blade temperature increases gradually.The cooling structure of pipe network can greatly improve the cooling performance of the mid-chord region,but the leading edge and trailing edge are not greatly improved,so it is necessary to further optimize the internal cooling structure.

关 键 词：透平叶片 新型冷却 数值模拟 管网冷却 

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]