Results 261 to 270 of about 328,216 (310)

Cooling Effectiveness on Film Cooled Turbine Blades

Heat Transfer: Volume 5 — Computational, Aerospace and Environmental Heat Transfer, 2001
Abstract This paper presents experiments on the cooling effectiveness obtained for two different injection locations on the suction side of a turbine blade at transonic flow conditions. Previous results of a computational analysis and flow visualization indicated that a separation bubble is present on the suction side at a location x/L =
M. Derrar, J. Nagler, W. W. Koschel
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Adiabatic Film Cooling Effectiveness Measurements Throughout Multirow Film Cooling Arrays

Journal of Turbomachinery, 2017
Adiabatic film cooling effectiveness measurements are obtained using pressure-sensitive paint (PSP) on a flat film cooled surface. The effects of blowing ratio and hole spacing are investigated for four multirow arrays comprised of eight rows containing 52 holes of 3.8 mm diameter with 20 deg inclination angles and hole length-to-diameter ratio of 11.2.
Natsui, Greg, Little, Zachary, Kapat, Jayanta S., Dees, Jason E.   +3 more
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Film Cooling Effectiveness and Heat Transfer of Rectangular-Shaped Film Cooling Holes

Volume 3: Turbo Expo 2002, Parts A and B, 2002
An experimental study has been conducted to measure the local film-cooling effectiveness and the heat transfer coefficient for a single row of rectangular-shaped holes. The holes have a 35° inclination angle with 3 hole diameter spacing of rectangular cross-sections.
Dong Ho Rhee, Youn Seok Lee, Hyung Hee Cho   +2 more
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Film-Cooling Performance and Heat Transfer over an Inclined Film-Cooled Surface

Journal of Thermophysics and Heat Transfer, 2008
Experiments have been performed to study and obtain the adiabatic wall film-cooling effectiveness and the heat transfer over a film-cooled surface that is made inclined at various angles with respect to a uniform flow. The vertical temperature distribution was measured to infer the flow structure and the rate of mixing of the film jet with the ...
C. S. Yang, C. L. Lin, C. Gau
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Film Cooling Effectiveness for Short Film Cooling Holes Fed by a Narrow Plenum

Journal of Turbomachinery, 1999
The adiabatic, steady-state liquid crystal technique was used to measure surface adiabatic film cooling effectiveness values in the near-hole region X/D<10. A parametric study was conducted for a single row of short holes L/D⩽3 fed by a narrow plenum H/D=1.
C. A. Hale, M. W. Plesniak, S. Ramadhyani   +2 more
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Double-Jet Ejection of Cooling Air for Improved Film Cooling

Journal of Turbomachinery, 2006
Film cooling in gas turbines leads to aerodynamic mixing losses and reduced temperatures of the gas flow. Improvements of the gas turbine thermal efficiency can be achieved by reducing the cooling fluid amount and by establishing a more equal distribution of the cooling fluid along the surface.
Karsten Kusterer, Dieter Bohn, Takao Sugimoto, Ryozo Tanaka   +3 more
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Cooling of coupled solids by helium films

Physical Review Letters, 1992
Recently, Mester et al. have made measurements of the cooling effect of a superfluid He film on a composite bolometer. In interpreting their results they suggest that the main thermal resistance is caused by an insufficient generation of excitations, which can cause evaporation, in the He film. In this Letter we suggest an alternative explanation which
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The Cooling Index: An Integral Measure of Film Cooling Performance

Heat Transfer in Gas Turbines, 1994
Abstract A simple measure of film cooling performance is presented to aid the preliminary design of gas turbines. The Cooling Index, CI, is defined as the reduction in total heat load due to the film cooling divided by the baseline (no film cooling) heat load over a specified area of a turbine blade, ΔQ˙fc/Q˙bl.
Robert P. Campbell, Robert J. Moffat
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Multi-slot film cooling

Letters in Heat and Mass Transfer, 1974
Abstract Measured and predicted values of adiabatic-wall effectiveness for multi-slot film cooling are compared and shown to be in close agreement. Further calculations are presented to demonstrate that the longitudinal spacing of the slots can be optimized to result in a minimum number of slots and coolant mass-flow requirement.
C.O. Folayan, J.H. Whitelaw
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Filmkühlung (film cooling)

2000
Es handelt sich um eine spezielle Methode zur Kuhlung von Oberflachen (engl.: heat protection), bei der durch diskrete Oberflachenoffnungen ein Fluidfilm zwischen das heise Gas der Ausenstromung und die Wand eingeblasen wird. Es besteht physikalisch eine enge Verwandtschaft zur sog. TranspirationskUhlung.
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