NDLI: Heat Transfer Coefficients and Film Cooling Effectiveness on the Squealer Tip of a Gas Turbine Blade

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Kwak, Jae Su Je-Chin Han
Copyright Year	2003
Abstract	Experimental investigations were performed to measure the detailed heat transfer coefficients and film cooling effectiveness on the squealer tip of a gas turbine blade in a five-bladed linear cascade. The blade was a two-dimensional model of a first stage gas turbine rotor blade with a profile of the GE-E3 aircraft gas turbine engine rotor blade. The test blade had a squealer (recessed) tip with a 4.22% recess. The blade model was equipped with a single row of film cooling holes on the pressure side near the tip region and the tip surface along the camber line. Hue detection based transient liquid crystals technique was used to measure heat transfer coefficients and film cooling effectiveness. All measurements were done for the three tip gap clearances of 1.0%, 1.5%, and 2.5% of blade span at the two blowing ratios of 1.0 and 2.0. The Reynolds number based on cascade exit velocity and axial chord length was 1.1×106 and the total turning angle of the blade was 97.9 deg. The overall pressure ratio was 1.2 and the inlet and exit Mach numbers were 0.25 and 0.59, respectively. The turbulence intensity level at the cascade inlet was 9.7%. Results showed that the overall heat transfer coefficients increased with increasing tip gap clearance, but decreased with increasing blowing ratio. However, the overall film cooling effectiveness increased with increasing blowing ratio. Results also showed that the overall film cooling effectiveness increased but heat transfer coefficients decreased for the squealer tip when compared to the plane tip at the same tip gap clearance and blowing ratio conditions.
Starting Page	648
Ending Page	657
Page Count	10
File Format	PDF
ISSN	0889504X
e-ISSN	15288900
Journal	Journal of Turbomachinery
Volume Number	125
Issue Number	4
DOI	10.1115/1.1622712
Language	English
Publisher	The American Society of Mechanical Engineers
Publisher Date	2003-12-01
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Blades Cascades (Fluid dynamics) Cavities Chords (Trusses) Coolants Cooling Gas turbines Heat transfer Heat transfer coefficients Leakage flows Liquid crystals Pressure Suction
Content Type	Text
Resource Type	Article
Subject	Mechanical Engineering

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