Effect of wake-disturbed flow on heat (mass) transfer to a turbine blade
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Author list: Olson S., Sanitjai S., Ghosh K., Goldstein R.J.
Publisher: American Society of Mechanical Engineers
Publication year: 2011
Journal: Journal of Turbomachinery (0889-504X)
Volume number: 133
Issue number: 1
ISSN: 0889-504X
eISSN: 1528-8900
Languages: English-Great Britain (EN-GB)
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Abstract
This study investigates the effect of wakes in the presence of varying levels of background freestream turbulence on the heat (mass) transfer from gas turbine blades. Measurements using the naphthalene sublimation technique provide local values of the mass transfer coefficient on the pressure and suction surfaces of a simulated turbine blade in a linear cascade. Experimental parameters studied include the pitch of the wake-generating blades (vanes), blade-row separation, Reynolds number, and the freestream turbulence level. The disturbed flow strongly affects the mass transfer Stanton number on both sides of the blade, particularly along the suction surface. An earlier transition to a turbulent boundary layer occurs with increased background turbulence, higher Reynolds number, and from wakes shed from vanes placed upstream of the linear cascade. Note that once the effects on mass transfer are known, similar variation on heat transfer can be inferred from the heat/mass transfer analogy. ฉ 2011 American Society of Mechanical Engineers.
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