NDLI: Film-Cooling Flowfields With Trenched Holes on an Endwall

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Sundaram, N. Thole, K. A.
Copyright Year	2008
Abstract	The leading edge region along the endwall of a stator vane experiences high heat transfer rates resulting from the formation of horseshoe vortices. Typical gas turbine endwall designs include a leakage slot at the combustor-turbine interface as well as film-cooling holes. Past studies have documented the formation of a horseshoe vortex at the leading edge of a vane, but few studies have documented the flowfield in the presence of an interface slot and film-cooling jets. In this paper, a series of flowfield measurements are evaluated at the leading edge with configurations including: a baseline with neither film-cooling holes nor an upstream slot, a row of film-cooling holes and an interface slot, and a row of film-cooling holes in a trench and an interface slot. The results indicated the formation of a second vortex present for the case with film-cooling holes and a slot relative to the baseline study. In addition, turbulence intensity levels as high as 50% were measured at the leading edge with film-cooling holes and a slot compared to the 30% measured for the baseline study. A trench was shown to provide improved overall cooling relative to the no trench configuration as more of the coolant stayed attached to the endwall surface with the trench.
Sponsorship	International Gas Turbine Institute
Starting Page	121
Ending Page	132
Page Count	12
File Format	PDF
ISBN	9780791843147
DOI	10.1115/GT2008-50149
e-ISBN	0791838242
Volume Number	Volume 4: Heat Transfer, Parts A and B
Conference Proceedings	ASME Turbo Expo 2008: Power for Land, Sea, and Air
Language	English
Publisher Date	2008-06-09
Publisher Place	Berlin, Germany
Access Restriction	Subscribed
Subject Keyword	Leakage Turbulence Cooling Gas turbines Vortices Stators Coolants Jets Film cooling Combustion chambers Heat transfer Turbines
Content Type	Text
Resource Type	Article

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