TY - GEN
T1 - Effect of high freestream turbulence with large length scale on blade heat/mass transfer
AU - Wang, H. P.
AU - Goldstein, R. J.
AU - Olson, S. J.
N1 - Publisher Copyright:
Copyright © 1998 by ASME.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1998
Y1 - 1998
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0031680884&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0031680884&partnerID=8YFLogxK
U2 - 10.1115/98-GT-107
DO - 10.1115/98-GT-107
M3 - Conference contribution
AN - SCOPUS:84973127000
VL - 4
T3 - Proceedings of the ASME Turbo Expo
BT - American Society of Mechanical Engineers (Paper)
PB - ASME
T2 - Proceedings of the 1998 International Gas Turbine & Aeroengine Congress & Exhibition
Y2 - 2 June 1998 through 5 June 1998
ER -