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Visualization of turbulent wedges under favourable pressure gradients using shear-sensitive and termperature-sensitive liquid crystals

Visualization of turbulent wedges under favourable pressure gradients using shear-sensitive and termperature-sensitive liquid crystals
Visualization of turbulent wedges under favourable pressure gradients using shear-sensitive and termperature-sensitive liquid crystals
Turbulent wedges induced by a three-dimensional surface roughness placed on a flat plate were studied using both shear sensitive and temperature sensitive liquid crystals, respectively denoted by SSLC and TSLC. The experiments were carried out at a free-stream velocity of 28 m/sec at three different favorable pressure gradients. The purpose of this investigation was to examine the spreading angles of the turbulent wedges, as indicated by their associated surface shear stresses and heat transfer characteristics, and to obtain more insight about the behavior of transitional momentum and thermal boundary layers when a streamwise pressure gradient exists. It was shown that under a zero pressure gradient the spreading angles indicated by the two types of liquid crystals are the same, but the difference increases as the level of the favorable pressure gradient increases. The result from the present study is important for modelling the transition of thermal boundary layers over gas turbine blades.
turbulent wedge, shear sensitive liquid crystals, temperature sensitive liquid crystals, boundary layer, pressure gradient, transition
0077-8923
95-102
Chong, T.P.
df7a2c0c-9f56-44dd-b668-8ef83d3e2c0d
Zhong, S.
e52648be-29fe-4597-bece-e28eec163b8b
Hodson, H.P.
33764088-9890-4258-8b49-70ebcd71d488
Chong, T.P.
df7a2c0c-9f56-44dd-b668-8ef83d3e2c0d
Zhong, S.
e52648be-29fe-4597-bece-e28eec163b8b
Hodson, H.P.
33764088-9890-4258-8b49-70ebcd71d488

Chong, T.P., Zhong, S. and Hodson, H.P. (2002) Visualization of turbulent wedges under favourable pressure gradients using shear-sensitive and termperature-sensitive liquid crystals. Annals of the New York Academy of Sciences, 972 (xi), 95-102.

Record type: Article

Abstract

Turbulent wedges induced by a three-dimensional surface roughness placed on a flat plate were studied using both shear sensitive and temperature sensitive liquid crystals, respectively denoted by SSLC and TSLC. The experiments were carried out at a free-stream velocity of 28 m/sec at three different favorable pressure gradients. The purpose of this investigation was to examine the spreading angles of the turbulent wedges, as indicated by their associated surface shear stresses and heat transfer characteristics, and to obtain more insight about the behavior of transitional momentum and thermal boundary layers when a streamwise pressure gradient exists. It was shown that under a zero pressure gradient the spreading angles indicated by the two types of liquid crystals are the same, but the difference increases as the level of the favorable pressure gradient increases. The result from the present study is important for modelling the transition of thermal boundary layers over gas turbine blades.

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More information

Published date: 2002
Keywords: turbulent wedge, shear sensitive liquid crystals, temperature sensitive liquid crystals, boundary layer, pressure gradient, transition

Identifiers

Local EPrints ID: 10263
URI: http://eprints.soton.ac.uk/id/eprint/10263
ISSN: 0077-8923
PURE UUID: 1bbee110-fb26-4d6b-9490-54ee3b84e571

Catalogue record

Date deposited: 29 Apr 2005
Last modified: 15 Jul 2019 19:37

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