Correlation of Film-Cooling Effectiveness From Thermographic Measurements at Enginelike Conditions
Author:
Baldauf S.1, Scheurlen M.1, Schulz A.2, Wittig S.2
Affiliation:
1. Siemens Power Generation, 45473 Mu¨lheim an der Ruhr, Germany 2. Lehrstuhl und Institut fu¨r Thermische Stro¨mungsmaschinen, Universita¨t Karlsruhe (TH), 76128 Karlsruhe, Germany
Abstract
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.
Publisher
ASME International
Subject
Mechanical Engineering
Reference25 articles.
1. Baldauf, S., Schulz, A., and Wittig, S., 1999, “High-Resolution Measurements of Local Effectiveness From Discrete Hole Film Cooling,” ASME J. Turbomach., 123, pp. 758–765. 2. Baldauf, S., Schulz, A., and Wittig, S., 1999, “High Resolution Measurements of Local Heat Transfer Coefficients From Discrete Hole Film Cooling,” ASME J. Turbomach., 123, pp. 749–757. 3. Baldauf, S., and Scheurlen, M., 1996, “CFD Based Sensitivity Study of Flow Parameters for Engine Like Film Cooling Conditions,” ASME Paper 96-GT-310. 4. Martiny, M., Schiele, R., Gritsch, M., Schulz, A., and Wittig, S., 1996, “In Situ Calibration for Quantitative Infrared Thermography,” Quirt ’96 Eurotherm Seminar No. 50, Stuttgart, Germany, September 2–5. 5. Pedersen, D. R., Eckert, E. R. G., and Goldstein, R. J., 1977, “Film Cooling With Large Density Differences Between the Mainstream and the Secondary Fluid Measured by the Heat-Mass Transfer Analogy,” ASME J. Heat Transfer, 99, pp. 620–627.
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