University of Surrey

Test tubes in the lab Research in the ATI Dance Research

Effect of roughness and unsteadiness on the performance of a new LPT blade at low Reynolds numbers

Montomoli, F, Hodson, H and Haselbach, F (2008) Effect of roughness and unsteadiness on the performance of a new LPT blade at low Reynolds numbers In: ASME Turbo Expo 2008: Power for Land, Sea, and Air (GT2008), 2008-06-09 - 2008-06-13, Berlin, Germany.

Full text not available from this repository.

Abstract

This paper presents a study of the performance of a high lift profile for low pressure turbines at Reynolds numbers lower than in previous investigations. The separate and combined effects of roughness and wake passing are compared. The effect of incidence on cascade losses is also evaluated. The experimental investigation was carried out in the high speed wind tunnel of Whittle Laboratory, University of Cambridge. This is a closed circuit, continuous wind tunnel where the Reynolds number and Mach number can be fixed independently. The unsteadiness caused by wake passing in front of the blades is reproduced using a wake generator with rotating bars. The results obtained confirm that the beneficial effect of unsteadiness on losses is also present at the lowest Reynolds number examined (Re3 = 0.2×105). Roughening the surface also had a beneficial effect on the losses but this effect vanishes at the lower Reynolds numbers, i.e. (Re3 0.3×105), where the surface becomes hydraulically smooth. The present study suggests that a blade with as-cast surface roughness has a lower loss than a polished one.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Authors :
NameEmailORCID
Montomoli, Ff.montomoli@surrey.ac.ukUNSPECIFIED
Hodson, HUNSPECIFIEDUNSPECIFIED
Haselbach, FUNSPECIFIEDUNSPECIFIED
Date : 2008
Identification Number : https://doi.org/10.1115/GT2008-50488
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:21
Last Modified : 17 May 2017 15:03
URI: http://epubs.surrey.ac.uk/id/eprint/834976

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800