摘要
该文通过数值模拟分析了不同吹风比和流向压力梯度条件下新型锯齿槽-孔结构的气膜冷却性能,旨在应对重型燃气轮机高温透平叶片冷却的挑战。文章重点探讨了顺、零、逆压力梯度对气膜贴壁性、冷却气膜展向覆盖及壁面温度沿流向发展的影响,其中以零压力梯度作为对比基准。结果表明,顺压力梯度通过抑制冷却射流的法向抬升,显著提升了气膜贴壁性,扩大了冷却覆盖范围,并有效减缓了壁面温度的升高;相反,逆压力梯度下冷气核心高度增加,冷却射流穿透性增强,使得壁面温度沿流向迅速上升。零压力梯度下的冷却效果则介于顺、逆压力梯度之间。该文为锯齿槽-孔结构在透平叶片冷却中的优化设计提供了参考数据和理论支持。
This study numerically analyzes the film cooling performance of a novel serrated trench-hole structure under varying blowing ratios and streamwise pressure gradients to address cooling challenges in high-temperature turbine blades for heavy-duty gas turbines.The research focuses on the effects of favorable,zero,and adverse pressure gradients on film attachment,lateral cooling coverage,and wall temperature progression along the streamwise direction,using zero pressure gradient as a baseline.Results indicate that favorable pressure gradients significantly improve film attachment,extend cooling coverage,and effectively mitigate wall temperature rise by suppressing the vertical lift of the cooling jet.In contrast,adverse pressure gradients increase the cooling jet’s vertical penetration,causing a rapid temperature rise downstream.Cooling performance under zero pressure gradients remains intermediate,showing moderate effects.This study provides valuable insights and theoretical support for optimizing serrated trench-hole structures in turbine blade cooling applications.
作者
贡文明
黄珂楠
李国能
贡伶俐
GONG Wenming;HUANG Kenan;LI Guoneng;Gong Linli(Jiangsu Huadian Qishuyan Power Generation Co.,Ltd.,Changzhou 213011,JiangShu,China;Department of Energy and Environment System Engineering,Zhejiang University of Science and Technology,Hangzhou 310023,Zhejiang,China)
出处
《电力大数据》
2025年第3期36-46,共11页
Power Systems and Big Data
基金
中国南方电网有限责任公司科技项目(060000KC22120037)。
关键词
数值模拟
燃气涡轮叶片
气膜冷却
压力梯度
浅槽孔
气膜冷却效率
numerical simulation
gas turbine blade
film cooling
pressure gradient
trenched hole
film cooling effectiveness
