Film Cooling With Compound Angle Holes: Adiabatic Effectiveness

Journal of Turbomachinery - Tập 118 Số 4 - Trang 807-813 - 1996
Donald L. Schmidt1, Basav Sen1, David G. Bogard1
1Mechanical Engineering Department, University of Texas at Austin, Austin, TX 78712

Tóm tắt

Film cooling effectiveness was studied experimentally in a flat plate test facility with zero pressure gradient using a single row of inclined holes, which injected high-density, cryogenically cooled air. Round holes and holes with a diffusing expanded exit were directed laterally away from the free-stream direction with a compound angle of 60 deg. Comparisons were made with a baseline case of round holes aligned with the free stream. The effects of doubling the hole spacing to six hole diameters for each geometry were also examined. Experiments were performed at a density ratio of 1.6 with a range of blowing ratios from 0.5 to 2.5 and momentum flux ratios from 0.16 to 3.9. Lateral distributions of adiabatic effectiveness results were determined at streamwise distances from 3 D to 15 D downstream of the injection holes. All hole geometries had similar maximum spatially averaged effectiveness at a low momentum flux ratio of I = 0.25, but the round and expanded exit holes with compound angle had significantly greater effectiveness at larger momentum flux ratios. The compound angle holes with expanded exits had a much improved lateral distribution of coolant near the hole for all momentum flux ratios.

Từ khóa


Tài liệu tham khảo

Brown A. , and SalujaC. L., 1979, “Film Cooling From a Single Hole and a Row of Holes of Variable Pitch to Diameter Ratio,” International Journal of Heat and Mass Transfer, Vol. 22, pp. 525–533.

Foster N. W. , and LampardD., 1980, “The Flow and Film Cooling Effectiveness Following Injection Through a Row of Holes,” ASME Journal of Engineering for Power, Vol. 102, pp. 584–588.

Goldstein R. J. , EckertE. R. G., EriksenV. L., and RamseyJ. W., 1970, “Film Cooling Following Injection Through Inclined Circular Tubes,” Israel Journal of Technology, Vol. 8, pp. 145–154.

Goldstein R. J. , EckertE. R. G., and BurggrafF., 1974, “Effects of Hole Geometry and Density on Three-Dimensional Film Cooling,” International Journal of Heat and Mass Transfer, Vol. 17, pp. 595–607.

Honami S. , ShizawaT., and UchiyamaA., 1994, “Behavior of the Laterally Injected Jet in Film Cooling: Measurements of Surface Temperature and Velocity/Temperature Field Within the Jet,” ASME JOURNAL OF TURBOMACHINERY, Vol. 116, pp. 106–112.

Ligrani P. M. , CirielloS., and BishopD. T., 1992, “Heat Transfer, Adiabatic Effectiveness, and Injectant Distributions Downstream of a Single Row and Two Staggered Rows of Compound Angle Film Cooling Holes,” ASME JOURNAL OF TURBOMACHINERY, Vol. 114, pp. 687–700.

Makki, Y. H., and Jakubowski, G. S., 1986, “An Experimental Study of Film Cooling From Diffused Trapezoidal Shaped Holes,” Paper No. AIAA-86-1326.

Moffat R. J. , 1988, “Describing Uncertainties in Experimental Results,” Experimental Thermal and Fluid Science, Vol. 1, pp. 3–17.

Pedersen D. R. , EckertE. R. G., and GoldsteinR. J., 1977, “Film Cooling With Large Density Differences Between the Mainstream and the Secondary Fluid Measured by the Heat-Mass Transfer Analogy,” ASME Journal of Heat Transfer, Vol. 99, pp. 620–627.

Pietrzyk J. R. , BogardD. G., and CrawfordM. E., 1990, “Effects of Density Ratio on the Hydrodynamics of Film Cooling,” ASME JOURNAL OF TURBOMACHINERY, Vol. 112, pp. 437–443.

Sathyamurthy, P., and Patankar, S. V., 1990, “Prediction of Film Cooling With Lateral Injection,” AIAA/ASME Thermophysics and Heat Transfer Conference, Seattle, WA.

Sen B. , SchmidtD. L., and BogardD. G., 1996, “Film Cooling With Compound Angle Holes: Heat Transfer,” ASME JOURNAL OF TURBOMACHINERY, Vol. 118, this issue, pp. 800–806.

Sinha A. K. , BogardD. G., and CrawfordM. E., 1991, “Film Cooling Effectiveness Downstream of a Single Row of Holes With Variable Density Ratio,” ASME JOURNAL OF TURBOMACHINERY, Vol. 113, pp. 442–449.

Thole, K. A., Sinha, A. K., Bogard, D. G., and Crawford, M. E., 1992, “Mean Temperature Measurements of Jets With a Crossflow for Gas Turbine Film Cooling Application,” in: Rotating Machinery Transport Phenomena, J. H. Kim and W. J. Yang, eds., Hemisphere Pub. Corp., New York.

Thông tin
Thông tin xuất bản

Journal of Turbomachinery

Tập 118 Số 4

807-813

Thông tin tác giả