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Effect of Surface Roughness on Loss Behaviour, Aerodynamic Loading and Boundary Layer Development of a Low-Pressure Gas Turbine Airfoil

[+] Author Affiliations
Marco Montis, Reinhard Niehuis

University of the German Federal Armed Forces, Neubiberg, Germany

Andreas Fiala

MTU Aero Engines GmbH, Munich, Germany

Paper No. GT2010-23317, pp. 1535-1547; 13 pages
doi:10.1115/GT2010-23317
From:
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 7: Turbomachinery, Parts A, B, and C
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4402-1 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by ASME

abstract

Aerodynamic measurements on the linear low-pressure turbine cascade T106C were conducted in a high speed test facility, in order to investigate the effect of surface roughness on loss behaviour, aerodynamic loading, and boundary layer development. Three different roughnesses were investigated, with a ratio of the center line average roughness to the profile chord of 0.8·10−5 , 5·10−5 and 25·10−5 . Tests were carried out under design outlet Mach number (Ma 2 th = 0.6 ), outlet Reynolds number ranging from Re 2 th = 5·104 to Re 2 th = 7·105 and inlet turbulence level Tu1 = 3% and Tu1 = 6% . The flow field downstream of the cascade and the loading distribution on the profiles were measured for each investigated operating point using five hole probes and surface static pressure taps. Additional measurements with a hot-wire probe in the suction surface (SS) boundary layer were also conducted, in order to investigate the differences in boundary layer development due to surface roughness. From loss and blade loading measurements it was found that roughness has no influence on the pressure distribution on the profile, although the highest investigated roughness produces a significant loss reduction at low Reynolds numbers. Hot-wire probe surveys show that at Re 2 th = 9·104 the boundary layer for the highest roughness immediately upstream of the flow separation point on the SS is substantially thinner than for the middle roughness and the smooth profile.

Copyright © 2010 by ASME

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