Title: A numerical study of the effect of roughness on the turbine blade cascade performance

Authors: Harkiran Singh, Lajpat Rai, S.R. Kale

Addresses: NTPC Limited, India. ' Mechanical Engineering Department, Manav Rachna College of Engineering, Faridabad, India. ' Mechanical Engineering Department, Indian Institute of Technology, Delhi, India

Abstract: In the present work the numerical simulation of a rectilinear blade cascade with surface roughness up to 100 µm over different locations of the turbine blade has been performed. It is observed that the effect of roughness on the efficiency of the turbine blade is more on the suction surface than that on the pressure surface. In case of suction surface, mass-averaged profile losses are more when roughness is provided on the trailing edge than on middle chord and losses are least when the roughness is provided on the leading edge, however pattern of losses is opposite with roughness on pressure surface.

Keywords: steam turbines; turbine blades; blade roughness; cascade performance; numerical simulation; surface roughness; suction surface; pressure surface; CFD; computational fluid dynamics.

DOI: 10.1504/PCFD.2008.021320

Progress in Computational Fluid Dynamics, An International Journal, 2008 Vol.8 No.7/8, pp.439 - 446

Published online: 19 Nov 2008 *

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