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Author : Khor Lin Keat
Publisher :
ISBN 13 :
Total Pages : 78 pages
Book Rating : 4.:/5 (12 download)
Download or read book The Effect of Turbulent Generator on Film Cooling Effectiveness for Flat Plate Film Cooling written by Khor Lin Keat and published by . This book was released on 2015 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (227 download)
Download or read book The Effect of High Freestream Turbulence on Film Cooling Effectiveness written by and published by . This book was released on 1994 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study investigated adiabatic wall cooling effectiveness of a single row of film cooling holes injecting into a turbulent flat plate boundary layer below a turbulent, zero pressure gradient freestream. Levels of freestream turbulence (Tu) up to 17.4% were generated using a method which simulates conditions at a gas turbine combustor exit. Film cooling was injected from a single row of five 35 degree slant-hole injectors (length/diameter = 3.5. pitch/diameter = 3.0) at blowing ratios from 0.55 to 1185 and at a nearly constant density ratio (coolant density/freestream density) of 0.95. Film cooling effectiveness data is presented for Tu levels ranging from 0.9% to 17% at a constant freestream Reynolds number based on injection hole diameter of 19000. Results show that elevated levels of freestream turbulence reduce film cooling effectiveness by up to 70% in the region directly downstream of the injection hole due to enhanced mixing. At the same time, high freestream turbulence also produces a 50-100% increase in film cooling effectiveness in the region between injection holds. This is due to accelerated spanwise diffusion of the cooling fluid, which also produces an earlier merger of the coolant jets from adjacent holes.
Author : Geoffrey W. Jumper
Publisher :
ISBN 13 :
Total Pages : 91 pages
Book Rating : 4.:/5 (227 download)
Download or read book Film Cooling Effectiveness on a Flat Plate in High Free-Stream Turbulence Using a Single Row of 30 Deg Slant-Hole Injectors written by Geoffrey W. Jumper and published by . This book was released on 1987 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the continuing search to understand the mechanisms influencing film cooling effectiveness, this thesis examines film cooling effectiveness on a flat plate in high free-stream turbulence using a single row of 30 slant-hole injectors. The primary area of focus is the area within 42 diameters down-stream of injection. of interest are blowing rates for optimum film cooling effectiveness within 10 diameters down-stream of injection, and the decay of film cooling effectiveness down the plate. Free-stream velocities from 50-175 fps and free-stream turbulence intensities from 13.5 - 18.5% were examined. Changes in Reynolds number or free-stream turbulence had little effect on blowing rates for optimum film cooling effectiveness. In comparison with tests conducted in low free-stream turbulence, around 5%, higher free-stream turbulence causes a faster decay in film cooling effectiveness down the plate.
Author : Matthew C. Gillcrist
Publisher :
ISBN 13 :
Total Pages : 63 pages
Book Rating : 4.:/5 (13 download)
Download or read book Freestream Deceleration Effects on Film Cooling Over a Flat Plate written by Matthew C. Gillcrist and published by . This book was released on 2021 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: Film cooling is a method used within gas turbines to cool the turbine blades by blowing air out of small holes in the blade surface of the blades. This allows the gas turbine to be run at higher internal temperatures, increasing the efficiency and power output of the engine. Regions of the curved turbine blade cause the freestream air flowing around it to accelerate and decelerate. This study seeks to determine the effects of this freestream deceleration on film cooling. The experiments accomplish this by using a flat plane with circular, angled holes in the surface to model a small portion of the gas turbine blade. Measurements were made for a zero acceleration case, and two decelerated cases at acceleration parameters (K), a non-dimensional value representing acceleration magnitude, of -0.50×10^-6 and -0.68×10^-6. Three different blowing ratios (M), ratios of the coolant jet velocity to the freestream airflow velocity, were studied in each case. Results show that freestream deceleration has little to no effect on film cooling effectiveness and Stanton number ratio. This information increases understanding of film cooling and allows models to be made more accurate.
Author : Geoffrey W. Jumper (MAJ, USAF.)
Publisher :
ISBN 13 :
Total Pages : 130 pages
Book Rating : 4.:/5 (132 download)
Download or read book Film Cooling Effectiveness on a Flat Plate in High Free-stream Turbulence Using a Single Row of 30#x1B;p0#x1B;s Slant-hole Injectors written by Geoffrey W. Jumper (MAJ, USAF.) and published by . This book was released on 1987 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ernst Rudolf Georg Eckert
Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.3/5 (91 download)
Download or read book Comparison of Effectiveness of Convection-, Transpiration-, and Film-cooling Methods with Air as Coolant written by Ernst Rudolf Georg Eckert and published by . This book was released on 1953 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Various parts of aircraft propulsion engines that are in contact with hot gases often require cooling. Transpiration and film cooling, new methods that supposedly utilize cooling air more effectively than the conventional convection cooling, have already been proposed. The present report presents material necessary for a comparison of the cooling requirements of these two new methods with conventional convection cooling. Correlations that are regarded by the authors as the most reliable today are employed in evaluating each of the cooling processes.
Author : James Edward Mayhew
Publisher :
ISBN 13 :
Total Pages : 482 pages
Book Rating : 4.:/5 (62 download)
Download or read book An Experimental Investigation of the Effect of Freestream Turbulence on Film Cooling Using Thermochromic Liquid Crystal Thermography written by James Edward Mayhew and published by . This book was released on 1999 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : In Sung Jung
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)
Download or read book Effects of orientation angles on film cooling over a flat plate: boundary layer temperature distributions and adiabatic film cooling effectiveness, ASME 99-GT-143 written by In Sung Jung and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented at the International Gas Turbine & Aeroengine Congress & Exhibition, Indianapolis, Indiana, June 7-10, 1999.
Author : Anant Bhaskar Mehendale
Publisher :
ISBN 13 :
Total Pages : 622 pages
Book Rating : 4.:/5 (253 download)
Download or read book Effect of High Mainstream Turbulence on Leading Edge Heat Transfer and Film Cooling written by Anant Bhaskar Mehendale and published by . This book was released on 1991 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Christian Liess
Publisher :
ISBN 13 :
Total Pages : 116 pages
Book Rating : 4.F/5 ( download)
Download or read book Film Cooling with Ejection from a Row of Inclined Circular Holes written by Christian Liess and published by . This book was released on 1973 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Cecil J. Marek
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (31 download)
Download or read book Effect of Free-stream Turbulence on Film Cooling written by Cecil J. Marek and published by . This book was released on 1975 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 328 pages
Book Rating : 4.:/5 (318 download)
Download or read book Film Cooling and Turbine Blade Heat Transfer written by and published by . This book was released on 1982 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : S. Yavuzkurt
Publisher :
ISBN 13 :
Total Pages : 238 pages
Book Rating : 4.F/5 ( download)
Download or read book Full-coverage Film Cooling written by S. Yavuzkurt and published by . This book was released on 1979 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Owen Michael O'Neal
Publisher :
ISBN 13 :
Total Pages : 206 pages
Book Rating : 4.:/5 (12 download)
Download or read book Measurements of Adiabatic Effectiveness from Full Coverage Film Cooling on a Scaled Turbine Vane with Laidback Fanshaped Holes written by Owen Michael O'Neal and published by . This book was released on 2017 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study was focused on measurements of adiabatic effectiveness on a scaled turbine vane which made use of a contoured endwall to match engine conditions. The vane model featured a full coverage film-cooling configuration with five rows of cylindrical holes in the showerhead and ten rows of laidback fanshaped holes distributed on the pressure and suction sides. The vane model was tested across a wide range of blowing ratios in several different coolant configurations including: individual rows on the pressure and suction side, full coverage tests with and without showerhead cooling, and full coverage tests at low and high mainstream turbulence levels. Comparisons between these configurations were made in order to assess the effects of local curvature, showerhead cooling, and mainstream turbulence levels. Single row tests measured in areas of high convex curvature tended to have an improved performance relative to flat plate predictions, while the opposite was true for rows in areas of concave curvature. Overall, showerhead cooling did not provide any significant improvements in effectiveness far downstream on both the pressure and suction side. Increasing mainstream turbulence levels tended to diminish the film cooling effectiveness. The negative effect of higher mainstream turbulence was most significant at low blowing ratios, but became negligible at higher flow rates.
Author : Louis Rustenburg
Publisher :
ISBN 13 :
Total Pages : 162 pages
Book Rating : 4.:/5 (19 download)
Download or read book Film Cooling Effects with Flow Over a Flat Plate written by Louis Rustenburg and published by . This book was released on 1967 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Stephen Andrew Hayes
Publisher :
ISBN 13 : 9781321503920
Total Pages : 125 pages
Book Rating : 4.5/5 (39 download)
Download or read book An Experimental Investigation on the Effects of Freestream Turbulence Intensity on Film Cooling Effectiveness and Heat Transfer Coefficient for an Anti-vortex Hole written by Stephen Andrew Hayes and published by . This book was released on 2014 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Warren W. Williams
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (224 download)
Download or read book Effects of an Embedded Vortex on a Single Film-cooling Jet in a Turbulent Boundary Layer written by Warren W. Williams and published by . This book was released on 1988 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Effects of embedded longitudinal vortices on heat transfer in a turbulent boundary layer film cooled from a single injections hole are discussed. Film coolant was injected at blowing ratios 0.50 to 1.50 at a freestream velocity of 10 m/s. A single longitudinal vortex was induced upstream of the film-cooling holes. Heat transfer measurement were made downstream of injection. Flow visualization tests were conducted after the injectant was contaminated with smoke. Surveys of mean velocity and mean temperature were also made in different spanwise normal planes. For all blowing ratios examined, the embedded vortices cause significant alterations to wall heat transfer and to film-cooling distributions. Embedded vortex, Film-cooling single jet, Heat transfer, Endwall secondary flows. (jes).
