NDLI: The Boundary Layer Over Turbine Blade Models With Realistic Rough Surfaces

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Hugh, M. Mcilroy Ralph, S. Budwig
Copyright Year	2005
Abstract	Results are presented of extensive boundary layer measurements taken over a flat, smooth plate model of the front one-third of a turbine blade and over the model with an embedded strip of realistic rough surface. The turbine blade model also included elevated freestream turbulence and an accelerating freestream in order to simulate conditions on the suction side of a high-pressure turbine blade. The realistic rough surface was developed by scaling actual turbine blade surface data provided by U. S. Air Force Research Laboratory. The rough patch can be considered to be an idealized area of distributed spalls with realistic surface roughness. The results indicate that bypass transition occurred very early in the flow over the model and that the boundary layer remained unstable (transitional) throughout the entire length of the test plate. Results from the rough patch study indicate the boundary layer thickness and momentum thickness Reynolds numbers increased over the rough patch and the shape factor increased over the rough patch but then decreased downstream of the patch. It was also found that flow downstream of the patch experienced a gradual re-transition to laminar-like behavior but in less time and distance than in the smooth plate case. Additionally, the rough patch caused a significant increase in streamwise turbulence intensity and normal turbulence intensity over the rough patch and downstream of the patch. Also, the skin friction coefficient over the rough patch increased by nearly 2.5 times the smooth plate value. Finally, the rough patch caused the Reynolds shear stresses to increase in the region close the plate surface.
Sponsorship	International Gas Turbine Institute
Starting Page	535
Ending Page	551
Page Count	17
File Format	PDF
ISBN	0791847306
DOI	10.1115/GT2005-68342
e-ISBN	0791837548
Volume Number	Volume 6: Turbo Expo 2005, Parts A and B
Conference Proceedings	ASME Turbo Expo 2005: Power for Land, Sea, and Air
Language	English
Publisher Date	2005-06-06
Publisher Place	Reno, Nevada, USA
Access Restriction	Subscribed
Subject Keyword	Suction Strips Turbulence Turbine blades Reynolds number Momentum Surface roughness Flow (dynamics) High pressure (physics) Skin friction (fluid dynamics) Shear stress Air force Shapes Boundary layers
Content Type	Text
Resource Type	Article

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