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• W3119522018 endingPage "106805" @default.
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• W3119522018 abstract "The harsh thermal environments and the complicated near-endwall secondary flows pose great challenges to the thermal management of a blade endwall. To improve the endwall aero-thermal performance, a series of inclined guide fins are mounted inside the interface gap, generating a positive pre-swirl purge flow. The effects of the guide fins' inclined angle on aerodynamic losses, film cooling effectiveness and heat transfer performance of an endwall are investigated under three coolant-to-mainstream mass flow ratios (MFR). Results indicate that the guide fins’ inclined angle exerts significant impacts on the flow-thermal interplay between the secondary flow structures and the coolant ejection. A positive pre-swirl purge flow stimulates the boundary layer fluid to weaken the near-endwall cross flows and thereby significantly reduces the blade aerodynamic losses, especially for MFR >1.0%. More importantly, increasing the inclined angle improves both the effectiveness and coverage of endwall film cooling dramatically when MFR <1.0%, although the cooling performance downstream of the slot exit is lowered when MFR = 1.5%. Besides, increasing the inclined angle marginally enhances the endwall heat transfer level when MFR = 0.5%, but significantly decreases that when MFR >1.0%. Overall, a positive pre-swirl purge flow is beneficial to improve the endwall thermal protection level." @default.
• W3119522018 created "2021-01-18" @default.
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• W3119522018 date "2021-05-01" @default.
• W3119522018 modified "2023-09-25" @default.
• W3119522018 title "Effects of the positive pre-swirl purge flow on endwall aero-thermal performance of a gas turbine blade" @default.
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• W3119522018 doi "https://doi.org/10.1016/j.ijthermalsci.2020.106805" @default.
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