The primary focus of this paper is to study the film cooling performance for a row of cylindrical holes each supplemented with two symmetrical antivortex holes, which branch out from the main holes. The antivortex design was originally developed at NASA-Glenn Research Center by James Heidmann, coauthor of this paper. This “antivortex” design is unique in that it requires only easily machinable round holes, unlike shaped film cooling holes and other advanced concepts. The hole design is intended to counteract the detrimental vorticity associated with standard circular cross-section film cooling holes. The geometry and orientation of the antivortex holes greatly affect the cooling performance downstream, which is thoroughly investigated. By performing experiments at a single mainstream Reynolds number of 9683 based on the freestream velocity and film hole diameter at four different coolant-to-mainstream blowing ratios of 0.5, 1, 1.5, and 2 and using the transient IR thermography technique, detailed film cooling effectiveness and heat transfer coefficients are obtained simultaneously from a single test. When the antivortex holes are nearer the primary film cooling holes and are developing from the base of the primary holes, better film cooling is accomplished as compared to other antivortex hole orientations. When the antivortex holes are laid back in the upstream region, film cooling diminishes considerably. Although an enhancement in heat transfer coefficient is seen in cases with high film cooling effectiveness, the overall heat flux ratio as compared to standard cylindrical holes is much lower. Thus cases with antivortex holes placed near the main holes certainly show promising results.
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April 2009
Research Papers
Film Cooling From a Row of Holes Supplemented With Antivortex Holes
Alok Dhungel,
Alok Dhungel
Mechanical Engineering Department,
Louisiana State University
, Baton Rouge, LA 70803
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Yiping Lu,
Yiping Lu
Mechanical Engineering Department,
Louisiana State University
, Baton Rouge, LA 70803
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Wynn Phillips,
Wynn Phillips
Mechanical Engineering Department,
Louisiana State University
, Baton Rouge, LA 70803
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James Heidmann
James Heidmann
Turbomachinery and Heat Transfer Branch,
NASA Glenn Research Center
, Cleveland, OH 44135-3191
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Alok Dhungel
Mechanical Engineering Department,
Louisiana State University
, Baton Rouge, LA 70803
Yiping Lu
Mechanical Engineering Department,
Louisiana State University
, Baton Rouge, LA 70803
Wynn Phillips
Mechanical Engineering Department,
Louisiana State University
, Baton Rouge, LA 70803
Srinath V. Ekkad
James Heidmann
Turbomachinery and Heat Transfer Branch,
NASA Glenn Research Center
, Cleveland, OH 44135-3191J. Turbomach. Apr 2009, 131(2): 021007 (10 pages)
Published Online: January 22, 2009
Article history
Received:
June 11, 2007
Revised:
December 5, 2007
Published:
January 22, 2009
Citation
Dhungel, A., Lu, Y., Phillips, W., Ekkad, S. V., and Heidmann, J. (January 22, 2009). "Film Cooling From a Row of Holes Supplemented With Antivortex Holes." ASME. J. Turbomach. April 2009; 131(2): 021007. https://doi.org/10.1115/1.2950059
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