Adiabatic film-cooling effectiveness on a flat plate surface downstream of a row of cylindrical holes is investigated. Highly resolved two-dimensional surface data were measured by means of infrared thermography and carefully corrected for local conduction and radiation effects. These locally acquired data are laterally averaged to give the streamwise distributions of the effectiveness. An independent variation of the flow parameters blowing rate, density ratio, and turbulence intensity as well as the geometrical parameters streamwise ejection angle and hole spacing is examined. The influences of these parameters on the lateral effectiveness is discussed and interpreted with the help of surface distributions of effectiveness and heat transfer coefficients presented in earlier publications. Besides the known jet in cross-flow behavior of coolant ejected from discrete holes, these data demonstrate the effect of adjacent jet interaction and its impact on jet lift-off and adiabatic effectiveness. In utilizing this large matrix of measurements the effect of single parameters and their interactions are correlated. The important scaling parameters of the effectiveness are shaped out during the correlation process and are discussed. The resulting new correlation is designed to yield the quantitatively correct effectiveness as a result of the interplay of the jet in crossflow behavior and the adjacent jet interaction. It is built modularly to allow for future inclusion of additional parameters. The new correlation is valid without any exception within the full region of interest, reaching from the point of the ejection to far downstream, for all combinations of flow and geometry parameters.
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October 2002
Technical Papers
Correlation of Film-Cooling Effectiveness From Thermographic Measurements at Enginelike Conditions
S. Baldauf,
S. Baldauf
Siemens Power Generation, 45473 Mu¨lheim an der Ruhr, Germany
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M. Scheurlen,
M. Scheurlen
Siemens Power Generation, 45473 Mu¨lheim an der Ruhr, Germany
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A. Schulz,
A. Schulz
Lehrstuhl und Institut fu¨r Thermische Stro¨mungsmaschinen, Universita¨t Karlsruhe (TH), 76128 Karlsruhe, Germany
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S. Wittig
S. Wittig
Lehrstuhl und Institut fu¨r Thermische Stro¨mungsmaschinen, Universita¨t Karlsruhe (TH), 76128 Karlsruhe, Germany
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S. Baldauf
Siemens Power Generation, 45473 Mu¨lheim an der Ruhr, Germany
M. Scheurlen
Siemens Power Generation, 45473 Mu¨lheim an der Ruhr, Germany
A. Schulz
Lehrstuhl und Institut fu¨r Thermische Stro¨mungsmaschinen, Universita¨t Karlsruhe (TH), 76128 Karlsruhe, Germany
S. Wittig
Lehrstuhl und Institut fu¨r Thermische Stro¨mungsmaschinen, Universita¨t Karlsruhe (TH), 76128 Karlsruhe, Germany
Contributed by the International Gas Turbine Institute and presented at the International Gas Turbine and Aeroengine Congress and Exhibition, Amsterdam, The Netherlands, June 3–6, 2002. Manuscript received by the IGTI, November 29, 2001. Paper No. 2002-GT-30180. Review Chair: E. Benvenuti.
J. Turbomach. Oct 2002, 124(4): 686-698 (13 pages)
Published Online: November 7, 2002
Article history
Received:
November 29, 2001
Online:
November 7, 2002
Citation
Baldauf , S., Scheurlen, M., Schulz , A., and Wittig, S. (November 7, 2002). "Correlation of Film-Cooling Effectiveness From Thermographic Measurements at Enginelike Conditions ." ASME. J. Turbomach. October 2002; 124(4): 686–698. https://doi.org/10.1115/1.1504443
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