Numerical investigation of active tip-clearance control through tip cooling injection in an axial turbine cascade |
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Authors: | Maosheng Niu Shusheng Zang |
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Affiliation: | Institute of Turbomachinery, School of Mechanical Engineering, Shanghai JiaoTong University, Shanghai 200240,China |
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Abstract: | This paper presents a numerical investigation of an active tip-clearance control method based on cooling injection from the
blade tip surface. It aims to study the influences of air injection on controlling tip clearance flow, with emphasis on the
effects of the injection location on secondary flow and the potential thermal benefits from the cooling jet. The results show
that injection location plays an important role in the redistribution of secondary flow within the cascade passage. Injection
located much closer to the pressure-side corner performs better in reducing tip clearance massflow and its associated losses.
However, it also intensifies tip passage vortex, due to less restraint deriving from the reduced tip clearance vortex. Lower
plenum total pressure is required to inject equivalent amount of cooling air, but the heat transfer condition on the blade
tip surface is a bit worse than that with injection from the reattachment region. Thus the optimum location of air injection
should be at the tip separation vortex region. |
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