NDLI: Turbine Blade Film Cooling Study: The Effects of Showerhead Geometry

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Zhang, Luzeng Moon, Hee Koo
Copyright Year	2006
Abstract	To optimize turbine blade showerhead film cooling, detailed film effectiveness was measured for four different showerhead geometries in a warm cascade simulating realistic engine operation conditions. Local film effectiveness distributions were obtained on both the pressure and suction surfaces of blade models using the pressure sensitive paint (PSP) technique. The four different geometries that have been investigated include: baseline geometry with a three-row showerhead; reduced injection angle geometry; a two-row geometry and increased diameter geometry. Nitrogen gas was used to simulate cooling flow as well as a tracer gas to indicate oxygen concentration such that film effectiveness by the mass transfer analogy could be obtained. Cooling mass flow was controlled to have a coherent comparison between the different geometries. Local film effectiveness distributions were measured for each of the cooling mass flows. Then the distributions were spanwise averaged for comparison. Reducing the injection angle or increasing the hole diameter, the film effectiveness improved slightly for a fixed total coolant flow. The two-row injection resulted in poor film effectiveness distribution possibly due to jet lift-off as it had higher momentum compared to the three-row injection.
Sponsorship	International Gas Turbine Institute
Starting Page	353
Ending Page	361
Page Count	9
File Format	PDF
ISBN	079184238X
DOI	10.1115/GT2006-90367
e-ISBN	0791837742
Volume Number	Volume 3: Heat Transfer, Parts A and B
Conference Proceedings	ASME Turbo Expo 2006: Power for Land, Sea, and Air
Language	English
Publisher Date	2006-05-08
Publisher Place	Barcelona, Spain
Access Restriction	Subscribed
Subject Keyword	Suction Oxygen Turbine blades Cooling Blades Cascades (fluid dynamics) Momentum Nitrogen Flow (dynamics) Pressure Engines Mass transfer Geometry Coolants Film cooling
Content Type	Text
Resource Type	Article

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