涡轮叶片前缘强化旋流-气膜复合高效冷却研究
Study on Enhanced Swirl-Film Composite High Efficiency Cooling of Turbine Blade Leading Edge
李菲 1栾勇 1饶宇 2程宇立1
作者信息
- 1. 上海交通大学机械与动力工程学院,上海 200240
- 2. 上海交通大学机械与动力工程学院,上海 200240;上海交通大学深圳研究院,深圳 518000
- 折叠
摘要
本文建立了 GE-E3高压涡轮第一级动叶前缘复合冷却模型,利用流热固耦合传热方法数值研究了冲击-气膜复合冷却和旋流-气膜复合冷却的流动换热特性,考虑了实际主流对前缘复合冷却效果的影响.在此基础上提出了内部凸脊通道的强化旋流-气膜复合冷却新型结构,分析了不同吹风比下前缘冷却模型的流场结构和传热分布.结果表明:在研究范围内,与冲击冷却相比,旋流冷却具有更均匀的传热分布和更低的压力损失;旋流在光滑内壁的冷却通道中平均努塞尔数可以提升17.6％以上,前缘平均综合冷效可以提升4.7％～7.2％,冷气端压力损失可降低4.7％～5.1％;而凸脊结构进一步强化了旋流冷却,内部冷却通道的平均努塞尔数可以显著提升37.7％以上,平均综合冷效可以提升6.1％～11.8％,压损可降低3.9％～4.1％.
Abstract
This paper establishes a composite cooling model for the leading edge of the first stage blade of GE-E3 high-pressure turbine,and numerically studies the flow and heat transfer character-istics of impingement-film composite cooling and swirl-film composite cooling using conjugate heat transfer method.The influence of actual mainstream and solid heat conduction on the blade leading edge composite cooling effect is considered.A new structure of enhanced swirl-film composite cooling with internal ridged wall is proposed.The flow field,heat transfer distribution,and pressure loss of three leading edge cooling models under different blowing ratios are analyzed in detail.The results indicate that within the range of parameters studied,compared to impingement,swirl cooling has a more uniform heat transfer distribution and lower pressure loss.The average Nusselt number of swirl cooling in a smooth inner wall can be increased by more than 17.6％,the overall average cooling efficiency of the leading edge can be increased by 4.7％～7.2％,and the pressure loss can be reduced by 4.7％～5.1％;The average Nusselt number of the swirl cooling in the internal ridged channel can be significantly increased by more than 37.7％,the overall average cooling efficiency can be improved by 6.1％～11.8％,and the pressure loss can be reduced by 3.9％～4.1％.
关键词
涡轮叶片前缘/冲击冷却/旋流-气膜复合冷却/冷却强化/耦合传热Key words
turbine blade leading edge/impingement cooling/swirl-film composite cooling/cooling enhancement/conjugate heat transfer引用本文复制引用
基金项目
国家自然科学基金资助项目(11972230)
上海市科委政府间国际科技合作项目(20110711000)
深圳市科技计划资助项目(JCYJ20210324123404011)
出版年
2024
NETL
NSTL
万方数据