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contributor authorQiang Zhang
contributor authorRicardo Trindade
contributor authorSri Sreekanth
contributor authorMatt Goodro
contributor authorPhillip M. Ligrani
date accessioned2017-05-09T00:20:21Z
date available2017-05-09T00:20:21Z
date copyrightMay, 2006
date issued2006
identifier issn0098-2202
identifier otherJFEGA4-27217#568_1.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/133949
description abstractThe effects of surface roughness on the aerodynamic performance of a turbine vane are investigated for three Mach number distributions, one of which results in transonic flow. Four turbine vanes, each with the same shape and exterior dimensions, are employed with different rough surfaces. The nonuniform, irregular, three-dimensional roughness on the tested vanes is employed to match the roughness which exists on operating turbine vanes subject to extended operating times with significant particulate deposition on the surfaces. Wake profiles are measured for two different positions downstream the vane trailing edge. The contributions of varying surface roughness to aerodynamic losses, Mach number profiles, normalized kinetic energy profiles, Integrated Aerodynamics Losses (IAL), area-averaged loss coefficients, and mass-averaged loss coefficients are quantified. Total pressure losses, Mach number deficits, and deficits of kinetic energy all increase at each profile location within the wake as the size of equivalent sandgrain roughness increases, provided the roughness on the surfaces is uniform. Corresponding Integrated Aerodynamic Loss IAL magnitudes increase either as Mach numbers along the airfoil are higher, or as the size of surface roughness increases. Data are also provided which illustrate the larger loss magnitudes which are present with flow turning and cambered airfoils, than with symmetric airfoils. Also described are wake broadening, profile asymmetry, and effects of increased turbulent diffusion, variable surface roughness, and streamwise development.
publisherThe American Society of Mechanical Engineers (ASME)
titleInfluence of Surface Roughness on the Aerodynamic Losses of a Turbine Vane
typeJournal Paper
journal volume128
journal issue3
journal titleJournal of Fluids Engineering
identifier doi10.1115/1.2175163
journal fristpage568
journal lastpage578
identifier eissn1528-901X
keywordsPressure
keywordsMach number
keywordsSurface roughness
keywordsTurbines
keywordsWakes
keywordsFlow (Dynamics) AND Airfoils
treeJournal of Fluids Engineering:;2006:;volume( 128 ):;issue: 003
contenttypeFulltext


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