球窝抑制层流分离的大涡模拟研究
Large-Eddy Simulation for Laminar Separation Control With Recessed Dimples
杨鹏骋 1陈绍文 1王松涛 1陈帅彤1
作者信息
- 1. 哈尔滨工业大学发动机气体动力研究中心,哈尔滨 150001
- 折叠
摘要
通过大涡模拟方法研究了球窝对低雷诺数下高负荷低压涡轮叶栅吸力侧层流分离的抑制效果和抑制机理,并将其和准二维的U型槽结构进行了对比分析.研究发现,低雷诺数下球窝通过产生周期性脱落的旋涡结构有效地促进了分离剪切层内展向涡的卷起和破碎,促进了转捩进程,因而可以有效抑制分离,在45000雷诺数下使损失相对减小了25.4％.同时和准二维结构相比,球窝产生的三维流动结构可以更有效地促进转捩进程,具有更好的流动控制效果.
Abstract
The Large-eddy simulations were performed to investigate the mechanism of laminar sep-aration control in a highly-loaded low-pressure turbine cascade with recessed dimples and a quasi-2D U-groove.The results show that a periodic shedding vortex is induced by the recessed dimple.The shedding vortex accelerates the formation and the breakdown of span-wise vortices,which indicates an earlier transition of the laminar boundary layer.As a result,the separation is inhabited sig-nificantly.At a condition of Reynold Number 45000,the total pressure loss is reduced by 25.4％via recessed dimple.Moreover,compared with the U-groove,the three-dimensional dimples could accelerating the transition process more effectively,and thus have a better performance in separation flow control.
关键词
球窝/低压涡轮/低雷诺数/层流分离/大涡模拟Key words
dimples/low-pressure turbine/low reynold number/laminar separation/large-eddy simulation引用本文复制引用
基金项目
国家自然科学基金(52076052)
国家科技重大专项(Y2019-Ⅷ-0013-0174)
出版年
2024
NETL
NSTL
维普
万方数据