Effect of Mainstream Velocity on the Heat Transfer Coefficient of Gas Turbine Blade Tips

Jin Young Jeong, Woojun Kim, Jae Su Kwak, Byung Ju Lee and Jin Taek Chung
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Jin Young Jeong: School of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang 10540, Korea
Woojun Kim: School of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang 10540, Korea
Jae Su Kwak: School of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang 10540, Korea
Byung Ju Lee: Department of Mechanical Engineering, Korea University, Seoul 02841, Korea
Jin Taek Chung: Department of Mechanical Engineering, Korea University, Seoul 02841, Korea

Energies, 2021, vol. 14, issue 23, 1-13

Abstract: This study experimentally investigated the effects of cascade inlet velocity on the distribution and the level of the heat transfer coefficient on a gas turbine blade tip. The tests were conducted in a transient turbine test facility at Korea Aerospace University, and three cascade inlet velocities—30, 60, and 90 m/s—were considered. The heat transfer coefficient was measured using the transient IR camera technique with a linear regression method, and both the squealer and plane tips were investigated. The results showed that the overall averaged heat transfer coefficient was generally proportional to the inlet velocity. As the inlet velocity is increased from 30 m/s to 60 m/s and 90 m/s, the heat transfer coefficient increased by 11.4% and 25.0% for plane tip, and 26.6% and 64.1% for squealer tip, respectively. However, the heat transfer coefficient near the leading edge of the squealer tip and the reattachment region of the plane tip was greatly affected by the cascade inlet velocity. Therefore, heat transfer experiments for a gas turbine blade tip should be performed under engine simulating conditions.

Keywords: gas turbine; heat transfer; blade tip; high speed condition (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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