The Effect of Seal Leakage Flow on Endwall Heat Transfer
The seal leakage flow of gas turbine has significant influence on the flow and heat transfer on the endwall.In this paper,the interaction between seal leakage flow and main stream with different mass flow ratio,leakage flow jet angle and leakage flow swirl angle on endwall heat transfer are analyzed by using the experimentally verified three-dimensional RANS numerical method.The results show that increasing the mass flow ratio of the leakage flow strengthens the horseshoe vortex and enhances the heat transfer.The mixing of pressure side leg and suction side leg of the horseshoe vortex is strengthened with the increase of swirl angle,resulting in enhanced heat transfer at the leading edge;The increase of jet angle reduces the penetrating force of leakage flow and enhances the heat transfer in front of cascade.The results are helpful for seal structure design and endwall thermal protection.
gas turbineseal leakage flowendwall heat transfernumerical simulations
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