湿空气含湿量对燃气轮机透平叶片复合冷却性能影响的实验与数值研究  

Influence of Humidity Ratio of Humid Air on Composite Cooling Performance of Gas Turbine Blades-Experimental and Numerical Approaches

作　　者：李健武 吴昕 谢昌亚 庞春凤[2] 刘双白[2] 李亮[1] LI Jianwu;WU Xin;XIE Changya;PANG Chunfeng;LIU Shuangbai;LI Liang(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;North China Electric Power Research Institute Co.,Ltd.,Beijing 100045,China)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]华北电力科学研究院有限责任公司,北京100045

出　　处：《西安交通大学学报》2024年第10期133-144,共12页Journal of Xi'an Jiaotong University

基　　金：国家科技重大专项资助项目(2017-Ⅰ-0009-0010)。

摘　　要：为了探究以湿空气作为冷却介质时透平叶片冷却的复合冷却性能,结合实验和数值方法探究了湿空气含湿量对透平叶片湿空气冷却性能的影响。以GE-E 3叶型为基础,建立了带有冲击冷却、U型带肋通道冷却、柱肋冷却、尾缘劈缝以及气膜冷却结构的复合冷却透平叶片。测量了不同冷气与主流质量流量比条件下,采用不同湿空气含湿量的湿空气作为冷却工质时50%叶高处叶片表面温度分布。实验结果表明,在不同的主流温度下,增加湿空气含湿量均能降低叶片表面温度。在主流进口温度分别为473、873 K条件下,采用含湿量分别为163.0、173.8 g/kg的湿空气作为冷却工质时,相较于17 g/kg的湿空气冷却工况,叶片表面冷却效率分别提高了9%~11%和7%~9%,叶片表面温度分别降低了4.1~5.2 K和19.0~21.3 K。数值研究结果表明:带γ-θ转捩模型的SST k-ω模型能够更为准确地预测湿空气冷却时的叶片表面的温度分布;湿空气含湿量的增加能够整体提高叶片表面冷却效率,叶片表面冷却效率的变化在气膜覆盖区域更为显著。To explore the composite cooling performance of turbine blades using humid air as the cooling medium,the influence of humidity ratio of humid air on composite cooling performance of gas turbine blades is investigated through combined use of experimental and numerical approaches.Based on the GE-E 3 blade profile,a blade with impingement cooling,U-shaped ribbed channels,pin fin structure,trailing edge slot and film cooling is established.The blade surface temperature at different positions at 50%blade height of the blade is measured under different mass flow ratios of coolant to mainstream using humid air with varying humidity ratio levels.The experimental results show that increasing the humid ratio consistently can reduce the blade surface temperature across different mainstream temperatures.Specifically,when the mainstream temperatures were 473 K and 873 K and humid air with a humid ratio of 163.0 and 173.8 g/kg was used as the coolant,the cooling efficiency of the blade surface increased by 9%—11%and 7%—9%respectively and the blade surface temperature decreased by around 4.1—5.2 K and 19.0—21.3 K compared to the condition with a humid ratio of 17 g/kg.Numerical results show that the SST k-ωmodel with theγ-θtransition model can accurately predict the temperature distribution on the blade surface for humid air cooling,increasing the humid ratio can improve overall cooling efficiency,and the change of cooling efficiency was especially significant in the film-cooling coverage area.

关 键 词：透平叶片 湿空气冷却 含湿量 复合冷却 

分 类 号：TK474.7[动力工程及工程热物理—动力机械及工程]