NDLI: Aerodynamic Losses of a Cambered Turbine Vane: Influences of Surface Roughness and Freestream Turbulence Intensity

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Zhang, Qiang Phillip, M. Ligrani
Copyright Year	2005
Abstract	The effects of surface roughness and freestream turbulence level on the aerodynamic performance of a turbine vane are experimentally investigated. Wake profiles are measured with three different freestream turbulence intensity levels (1.1%, 5.4% and 7.7%) at two different locations downstream of the test vane trailing edge (one and 0.25 axial chord lengths). Chord Reynolds number based on exit flow conditions is 0.9 × 106. The Mach number distribution and the test vane configuration both match arrangements employed in an industrial application. Four cambered vanes with different surface roughness levels are employed in this study. Effects of surface roughness on the vane pressure side on the profile losses are relatively small compared with suction side roughness. Overall effects of turbulence on local wake deficits of total pressure, Mach number, and kinetic energy are almost negligible in most parts of the wake produced by the smooth test vane, except that higher freestream losses are present at higher turbulence intensity levels. Profiles produced by test vanes with rough surfaces show apparent lower peak values in the center of the wake. Integrated Aerodynamic Losses (IAL) and area-averaged loss coefficient YA are also presented and compared with results from other research groups.
Sponsorship	Heat Transfer Division
Starting Page	489
Ending Page	501
Page Count	13
File Format	PDF
ISBN	0791842215
DOI	10.1115/IMECE2005-81657
e-ISBN	0791837696
Volume Number	Heat Transfer, Part A
Conference Proceedings	ASME 2005 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2005-11-05
Publisher Place	Orlando, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Suction Turbulence Reynolds number Chords (trusses) Wakes Surface roughness Kinetic energy Pressure Flow (dynamics) Turbines Mach number
Content Type	Text
Resource Type	Article

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Aerodynamic Losses of a Cambered Turbine Vane: Influences of Surface Roughness and Freestream Turbulence Intensity

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