A Comparative Study of Purge Flow Aero-Thermal Performance under Pre-Swirl and Rotational Conditions  

作　　者：GAO Hongyu WANG Yutian XU Renjie XU Qingzong 

机构地区：[1]School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai,200093,China [2]Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing,100045,China

出　　处：《Journal of Thermal Science》2025年第2期626-638,共13页热科学学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant No.52106064)。

摘　　要：Investigating the interaction between purge flow and main flow in gas turbines is crucial for optimizing thermal management,and enhancing aerodynamic efficiency.Measuring the high-speed rotating rotor poses challenges;however,employing the pre-swirl method to model rotational effect can facilitate experimental measurements.This study evaluates the validity of the pre-swirl method for modeling rotational effects.Numerical simulations are conducted under both stationary conditions,with seven swirl ratios,and rotational conditions.The investigation focuses on the underlying mechanisms of pre-swirl and rotation.Pre-swirl and rotation impart circumferential velocity to the purge flow relative to the blade,resulting in a diminishing effect on endwall cooling.On the other hand,pre-swirl reduces the adverse pressure gradient,and the rotation generates Coriolis forces acting on the passage vortex,both contribute to an increasing effect on endwall cooling.Under pre-swirl condition,the diminishing effect is dominant,while in rotational condition,neither the diminishing nor the increasing effect exhibits an overwhelmingly dominant trend.

关 键 词：gas turbine rotational effect pre-swirl purge flow endwall cooling effectiveness 

分 类 号：O35[理学—流体力学]