Transactions of Nanjing University of Aeronautics & Astronautics
Experiment on Effect of Tip Clearance Leakage Flow on Heat Transfer of Turbine Outer Ring
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Abstract:
The cascade model was tested using transient liquid crystal temperature measurement technology. The effects of main flow Reynolds number， blowing ratio and tip clearance height on the convective heat transfer coefficient of the turbine outer ring were studied. Two feature lines were marked on the turbine outer ring corresponding to the position of the blade. The conclusions are as follows： The tip clearance leakage flow has a great influence on the convective heat transfer coefficient of the turbine outer ring. When the clearance height and the blowing ratio are kept constant， gradually increasing the main flow Reynolds number will result in an increase in the convective heat transfer coefficient of the turbine outer ring. When the clearance height and the main flow Reynolds number are kept constant and the blowing ratio is gradually increased， the convective heat transfer coefficient of the turbine outer ring is almost constant. The heat transfer coefficient of the turbine outer ring surface is little affected by the blowing ratio； The clearance height has great influence on the heat transfer characteristics of the turbine outer ring. Under the typical working condition in this paper， when the tip clearance height ratio is 1.6%， the convective heat transfer coefficient of the outer surface of the turbine is the highest.
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Clc Number:
TK121
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