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Effect Of High Free Stream Turbulence On Film Cooling Using Double Row Of 30 Degree Slant Hole Injectors
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Book Synopsis Effect of High Free Stream Turbulence on Film Cooling Using Double Row of 30 Degree Slant-hole Injectors by : Lilith I. Sorensen
Download or read book Effect of High Free Stream Turbulence on Film Cooling Using Double Row of 30 Degree Slant-hole Injectors written by Lilith I. Sorensen and published by . This book was released on 1998 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of High Free Stream Turbulence on Film Cooling Using Double Row of 30 Deg. Slant-Hole Injectors by : Lilith I. Sorensen
Download or read book Effect of High Free Stream Turbulence on Film Cooling Using Double Row of 30 Deg. Slant-Hole Injectors written by Lilith I. Sorensen and published by . This book was released on 1998-03-01 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study free stream turbulence levels from 7.3% to 17.8% are applied to film cooling over a flat plate with two rows of 30 deg slant holes using a wall jet as the main stream air supply and source of turbulence. Blowing ratios are varied from 0.25 to 2.0 and free stream velocities at injection range from 10 m/s to 85 m/s. A constant density ratio of 1.07 is kept throughout the experiment. Results show that for different magnitudes of blowing ratio free stream turbulence has a different influence on effectiveness. At the forward stations, where blow off was present at high blowing ratios, high free stream turbulence increased effectiveness. While at mid to aft stations for all blowing ratios high free stream turbulence decreased effectiveness. A correlation for effectiveness with a non-dimensional group of film cooling parameters is offered. The effectiveness correlated best 10 to 15 diameters after injection where blow off effects are no longer present, and before the very far downstream stations where uncertainties in the measurements were greater.
Book Synopsis The Effect of High Freestream Turbulence on Film Cooling Effectiveness by :
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.
Book Synopsis Film Cooling Effectiveness on a Flat Plate in High Free-Stream Turbulence Using a Single Row of 30 Deg Slant-Hole Injectors by : Geoffrey W. Jumper
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.
Book Synopsis 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 by : Geoffrey W. Jumper (MAJ, USAF.)
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 :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721978694 Total Pages :322 pages Book Rating :4.9/5 (786 download)
Book Synopsis Effects of Hole Length, Supply Plenum Geometry, and Freestream Turbulence on Film Cooling Performance by : National Aeronautics and Space Administration (NASA)
Download or read book Effects of Hole Length, Supply Plenum Geometry, and Freestream Turbulence on Film Cooling Performance written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-27 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental measurements are presented in this report to document the sensitivity of film cooling performance to the hole length and coolant delivery plenum geometry. Measurements with hot-wire anemometry detail velocity, local turbulence, and spectral distributions over the exit plane of film cooling holes and downstream of injection in the coolant-freestream interaction zone. Measurements of discharge coefficients and adiabatic effectiveness are also provided. Coolant is supplied to the film cooling holes by means of a large, open plenum and through plenums which force the coolant to approach the holes either co-current or counter-current to the freestream. A single row of film cooling holes with 35 degree-inclined streamwise at two coolant-to-freestream velocity ratios, 0.5 and 1.0, is investigated. The coolant-to-freestream density ratio is maintained in the range 0.96 to 1.0. Measurements were taken under high-freestream (FSTI = 12%) and low-freestream turbulence intensity (FSTI = 0.5%) conditions. The results document the effects of the hole L/D, coolant supply plenum geometry, velocity ratio, and FSTI. In general, hole L/D and the supply plenum geometry play influential roles in the film cooling performance. Hole L/D effects, however, are more pronounced. Film cooling performance is also dependent upon the velocity ratio and FSTI. Burd, Steven W. and Simon, Terrence W. and Thurman, Douglas (Technical Monitor) Glenn Research Center NAG3-1638; RTOP 714-01-4A...
Book Synopsis Influence of In-Hole Roughness and High Freestream Turbulence on Film Cooling From a Shaped Hole by : Robert Schroeder
Download or read book Influence of In-Hole Roughness and High Freestream Turbulence on Film Cooling From a Shaped Hole written by Robert Schroeder and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas turbines are heavily used for electricity generation and aircraft propulsion with a strong desire in both uses to maximize thermal efficiency while maintaining reasonable power output. As a consequence, gas turbines run at high turbine inlet temperatures that require sophisticated cooling technologies to ensure survival of turbine components. One such technology is film cooling with shaped holes, where air is withdrawn from latter stages of the compressor, is bypassed around the combustor, and is eventually ejected out holes in turbine component surfaces. Air ejected from these shaped holes helps maintain components at temperatures lower than flow from the combustor. Many studies have investigated different factors that influence shaped hole performance. However, no studies in open literature have investigated how cooling performance is affected by roughness along interior walls of the shaped hole. The effect of in-hole roughness on shaped hole film cooling was the focus of this research. Investigation of in-hole roughness effects first required the determination of behavior for a shaped hole with smooth walls. A public shaped hole, now used by other investigators as well, was designed with a diffused outlet having 7 degree expansion angles and an area ratio of 2.5. At low freestream turbulence intensity of 0.5%, film cooling adiabatic effectiveness for this smooth hole was found to peak at a blowing ratio of 1.5. Measurements of flowfields and thermal fields revealed causes of this behavior. Blowing ratio increases above 1.5 caused the jet from the smooth hole to penetrate higher into the surrounding mainstream, exhibit a stronger counter-rotating vortex pair, and have narrower contact with the wall than at lower blowing ratios. Experiments performed at high freestream turbulence intensity of 13% revealed dynamics of how freestream turbulence both diluted and laterally spread coolant. At the high blowing ratio of 3 the dilution and spreading were competing effects, such that elevated freestream turbulence did not cause a decrease in area-averaged effectiveness. At the blowing ratio of 1.5, high freestream turbulence caused area-averaged effectiveness to decrease 17% relative to the low freestream turbulence case. Film cooling performance was measured for the shaped hole geometry with several different configurations of in-hole roughness. At low freestream turbulence intensity, in-hole roughness caused decreases in area-averaged adiabatic effectiveness up to 61% relative to the smooth hole performance. These percent decreases in adiabatic effectiveness were more severe with increasing roughness levels and with increasing blowing ratios. Flowfield and thermal field measurements for the configuration with largest roughness size showed that the decrease in adiabatic effectiveness for rough holes as compared to smooth holes was due to thicker boundary layers along the interior walls of the cooling holes. The thicker boundary layers resulted in faster jet core flow, which in turn caused increased penetration of coolant into the mainstream and increased turbulence intensity inside the jet, with both leading to reduced adiabatic effectiveness. Detrimental effects of in-hole roughness persisted at the high freestream turbulence conditions as well.
Book Synopsis Masters Theses in the Pure and Applied Sciences by : Wade H. Shafer
Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 411 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1 957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 32 (thesis year 1987) a total of 12,483 theses titles from 22 Canadian and 176 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 32 reports theses submitted in 1987, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.
Book Synopsis An Experimental Investigation of the Effect of Freestream Turbulence on Film Cooling Using Thermochromic Liquid Crystal Thermography by : James Edward Mayhew
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:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1987 with total page 1124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Air University Abstracts of Research Reports by :
Download or read book Air University Abstracts of Research Reports written by and published by . This book was released on 1986 with total page 932 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Free-stream Turbulence on Film Cooling by : Cecil J. Marek
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:
Book Synopsis Effects of Hole Length, Supply Plenum Geometry, and Freestream Turbulence on Film Cooling Performance by :
Download or read book Effects of Hole Length, Supply Plenum Geometry, and Freestream Turbulence on Film Cooling Performance written by and published by . This book was released on 2000 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ninety Degree Skew Leading Edge Film Cooling Effectiveness, Heat Transfer, and Discharge Coefficients for Cylindrical Film Holes at High Free Stream Turbulence by :
Download or read book Ninety Degree Skew Leading Edge Film Cooling Effectiveness, Heat Transfer, and Discharge Coefficients for Cylindrical Film Holes at High Free Stream Turbulence written by and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper studies the film effectiveness and heat transfer coefficients on a large scale symmetric circular leading edge with three rows of film holes. The film hole configuration focuses on a smaller injection angle of 20 deg and a larger hole pitch with respect to the hole diameter (P/d=7.86). The study includes four blowing ratios (M=1.0, 1.5, 2.0 and 2.5), two Reynolds numbers (Re-30,000 and 60,000), and two free stream turbulence levels (approximately Tu=1% and 20% depending on the Reynolds number). The measured discharge coefficients of the film holes were 0.62-0.69 and 0.39 -0.54 at the stagnation row and 0.54-0.59 and 0.47-0.52 at 21.5 deg the row, for the range of blowing ratios investigated and Re's of 60,000 and 30,000 respectively. A transient liquid crystal technique was used to obtain the film cooling effectiveness and the heat transfer coefficients. The distributions of film effectiveness and heat transfer coefficient are obtained with spatial resolutions of 0.6mm or 13% of the film cooling hole diameter. Results are presented for detailed and spanwise averaged values of film effectiveness and Frossling number. Blowing ratios investigated result in up to 2.8 times the lowest blowing ratio's film effectiveness. Increasing the Reynolds number from 30,000 to 60,000 results in increasing the effectiveness by up to 55% at high (20%)turbulence. Turbulence intensity has up to a 60% attenuation on effectiveness between rows at Re=30,000. The turbulence intensity has the same order of magnitude but opposite effect as Reynolds number, which also has the same order of magnitude effect as blowing ratio on the film effectiveness. A crossover from attenuation to improved film effectiveness after the second row of film holes is found for the high turbulence case as blowing ratio increases. The blowing ratio of two shows a spatial coupling of the stagnation row of film holes with the second row (2.15 deg) of film holes, which results in the highest Frossling num7.
Book Synopsis Measurements in Film Cooling Flows by :
Download or read book Measurements in Film Cooling Flows written by and published by . This book was released on 1996 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hot-wire anemometry of simulated film cooling was used to study the influence of freestream turbulence intensity and film cooling hole length-to-diameter ratio on mean velocity and turbulence intensity. Measurements were made in the zone where the coolant and freestream flows mix. Flow from one row of film cooling holes with a streamwise injection of 35° and no lateral injection and with a coolant- to-freestream flow velocity ratio of 1.0 was investigated under freestream turbulence levels of 0.5 and 12%. Coolant-to-freestream density ratio was unity. Two length-to-diameter ratios for the film cooling holes, 2.3 and 7.0, are tested. Results show that under low freestream turbulence conditions, pronounced differences exist in the flowfield between L/D=7.0 and 2.3; the differences are less prominent at high freestream turbulence intensities. Generally, short-L/D injection results in ''jetting'' of the coolant further into the freestream flow and enhanced mixing. Other changes in the flowfield attributable to a rise in freestream turbulence intensity to engine- representative conditions are documented. 15 figs, 2 tabs, refs.
Book Synopsis Effect on Gaseous Film Cooling of Coolant Injection Through Angled Slots and Normal Holes by : S. Stephen Papell
Download or read book Effect on Gaseous Film Cooling of Coolant Injection Through Angled Slots and Normal Holes written by S. Stephen Papell and published by . This book was released on 1960 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stagnation Region Gas Film Cooling by : D. W. Luckey
Download or read book Stagnation Region Gas Film Cooling written by D. W. Luckey and published by . This book was released on 1981 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
