Effect of high freestream turbulence with large length scale on blade heat/mass transfer

H. P. Wang, R. J. Goldstein, S. J. Olson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

The naphthalene sublimation technique is used to investigate the influence of high freestream turbulence with large length scale on the heat/mass transfer from a turbine blade in a highly accelerated linear cascade. The experiments are conducted at four exit Reynolds numbers, ranging from 2.4×105 to 7.8×105, with freestream turbulence of 3%, 8.5% and 18% and corresponding integral length scales of 0.9 cm, 2.6 cm and 8 cm, respectively. On the suction surface, the heat/mass transfer rate is significantly enhanced by high freestream turbulence due to an early boundary layer transition. By contrast, the transition occurs very late, and may not occur at very low Reynolds numbers with low freestream turbulence. In the turbulent boundary layer, lower heat/mass transfer rates are found for the highest freestream turbulence level with large length scale than for the moderate turbulence levels with relatively small scales. Similar phenomena also occur at the leading edge. However, the effect of turbulence is not as pronounced in the laminar boundary layer.

Original languageEnglish (US)
Title of host publicationAmerican Society of Mechanical Engineers (Paper)
PublisherASME
Volume4
ISBN (Electronic)9780791878651
DOIs
StatePublished - 1998
EventProceedings of the 1998 International Gas Turbine & Aeroengine Congress & Exhibition - Stockholm, Sweden
Duration: Jun 2 1998Jun 5 1998

Publication series

NameProceedings of the ASME Turbo Expo
Volume4

Other

OtherProceedings of the 1998 International Gas Turbine & Aeroengine Congress & Exhibition
CityStockholm, Sweden
Period6/2/986/5/98

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