Results 211 to 220 of about 12,448 (265)
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Effect of blowing ratio on the relaminarization phenomenon over convex curved wall
Acta Mechanica Sinica, 2022zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Su, Wei-Yi +2 more
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On steady and pulsed low-blowing-ratio transverse jets
Journal of Fluid Mechanics, 2013AbstractThe present experimental and numerical study focuses on the vortical structures encountered in steady and pulsed low-blowing-ratio transverse jets ($0. 150\leq \mathit{BR}\leq 4. 2$), a configuration hardly discussed in the literature. Under unforced conditions at low blowing ratio, a stable leading-edge shear-layer rollup is identified inside ...
Bidan, G., Nikitopoulos, D. E.
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Optimization of the blowing ratio for film cooling on a flat plate
International Journal of Numerical Methods for Heat & Fluid Flow, 2017Purpose The purpose of this paper is to report the result of a numerical investigation of film cooling performance on a flat plate for finding optimum blowing ratios. Design/methodology/approach Steady-state simulations have been performed, and the flow has been considered incompressible. Calculations have been performed with 3D finite-volume method
Mojtaba Kazemi Kelishami, Esmail Lakzian
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Effect of Uncertainty in Blowing Ratio on Film Cooling Effectiveness
Volume 3: Gas Turbine Heat Transfer; Transport Phenomena in Materials Processing and Manufacturing; Heat Transfer in Electronic Equipment; Symposium in Honor of Professor Richard Goldstein; Symposium in Honor of Prof. Spalding; Symposium in Honor of Prof. Arthur E. Bergles, 2013In this study the effect of randomness of blowing ratio on film cooling performance is investigated by combining direct numerical simulations with a stochastic collocation approach. The geometry includes a 35-degree inclined jet with a plenum attached to it. The blowing ratio variations are assumed to have a truncated Gaussian distribution with mean of
Hessam Babaee +2 more
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Effects of Density and Blowing Ratios on the Turbulent Structure and Effectiveness of Film-Cooling
Volume 5A: Heat Transfer, 2018Large eddy simulations (LES) were performed to investigate film cooling of a flat plate, where the cooling jets issued from a plenum through one row of circular holes of diameter D and length 4.7D that are inclined at 35° relative to the plate.
Zachary T. Stratton, Tom I-P. Shih
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Ratio of nose blow results to intakes during the decommissioning of a facility at Dounreay
Radiation Protection Dosimetry, 2007During the decommissioning of a large glove box facility at Dounreay, in addition to engineering and administration controls, workers wore pressurised suits to minimise their intake of radionuclides. The workers provided nose blows after each suited operation to provide an indication of the effectiveness of protective measures. The nose blows were also
David, Spencer +2 more
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Influence of Blowing Ratio on the Double-Jet Ejection of Cooling Air
Volume 4: Turbo Expo 2007, Parts A and B, 2007Further improvement of the thermal efficiency of modern gas turbines can be achieved by a further reduction of the cooling air amount. Therefore, it is necessary to increase the cooling effectiveness so that the available cooling air fulfils the cooling task even if the amount has been reduced. In particular, the cooling effort for the vanes and blades
Karsten Kusterer +3 more
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Film cooling in the trailing edge cutback with different land shapes and blowing ratios
International Communications in Heat and Mass Transfer, 2021Abstract The cutback was widely used in advanced gas turbines to protect the trailing edge. The land was a main structure in the cutback region. Therefore, the present study describes a numerical investigation on the film cooling performance in the cutback region with various land shapes (straight- expanding land, arch- expanding land, contracting ...
Wei Du +3 more
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Aerodynamics of Low-Blowing-Ratio Fuselage Injection into a Supersonic Freestream
Journal of Spacecraft and Rockets, 2005A parametric characterization of the surface flow structure and associated aerodynamic loading for injection into a Mach 3.0 freestream through jets mounted into the side of missile fuselage (sharp-coned cylinder) was experimentally achieved. The experimental methods included surface oil flow visualization, shadowgraph photography, and pressure ...
Zakaria Mahmud, Rodney D. W. Bowersox
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Effects of Oscillations in the Mainstream on Film Cooling at Various Blowing Ratios
Volume 5A: Heat Transfer, 2017The objective of this study is to understand the effects of flow oscillations in the mainstream and film cooling jets on film cooling at various blowing ratios (0.5, 0.78, 1.0 and 1.5). These oscillations could be caused by the combustion instabilities. They are approximated in sinusoidal form for the current study. The effects of different frequencies
Seung Il Baek, Savas Yavuzkurt
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