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Surface Measurements And Predictions Of Full Coverage Film Cooling
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Book Synopsis Surface Measurements and Predictions of Full-coverage Film Cooling by : Greg Natsui
Download or read book Surface Measurements and Predictions of Full-coverage Film Cooling written by Greg Natsui and published by . This book was released on 2012 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Full-coverage film cooling is investigated both experimentally and numerically. First, surface measurements local of adiabatic film cooling eeffectiveness and heat transfer augmentation for four different arrays are described. Reported next is a comparison between two very common turbulence models, Realizable k-[epsilon] and SST k-[omega], and their ability to predict local film cooling effectiveness throughout a full-coverage array. The objective of the experimental study is the quantification of local heat transfer augmentation and adiabatic film cooling effectiveness for four surfaces cooled by large, both in hole count and in non-dimensional spacing, arrays of film cooling holes. The four arrays are of two different hole-to-hole spacings (P/D = X/D = 14.5; 19.8) and two different hole inclination angles ([alpha] = 30°; 45°), with cylindrical holes compounded relative to the flow ([beta] = 45°) and arranged in a staggered configuration. Arrays of up to 30 rows are tested so that the superposition effect of the coolant film can be studied. In addition, shortened arrays of up to 20 rows of coolant holes are also tested so that the decay of the coolant film following injection can be studied. Levels of laterally averaged effectiveness reach values as high as [eta with line above]= 0.5, and are not yet at the asymptotic limit even after 20-30 rows of injection for all cases studied. Levels of heat transfer augmentation asymptotically approach values of h=h0 [almost equal to] 1.35 rather quickly, only after 10 rows. It is conjectured that the heat transfer augmentation levels off very quickly due to the boundary layer reaching an equilibrium in which the perturbation from additional film rows has reached a balance with the damping effect resulting from viscosity. The levels of laterally averaged adiabatic film cooling effectiveness far exceeding [eta with line above]= 0.5 are much higher than expected. The heat transfer augmentation levels off quickly as opposed to the film effectiveness which continues to rise (although asymptotically) at large row numbers. This ensures that an increased row count represents coolant well spent. The numerical predictions are carried out in order to test the ability of the two most common turbulence models to properly predict full-coverage film cooling. The two models chosen, Realizable k-[epsilon] (RKE) and Shear Stress Transport k-[omega] (SSTKW), are both two-equation models coupled with Reynolds Averaged governing equations which make several gross physical assumptions and require several empirical values. Hence, the models are not expected to provide perfect results. However, very good average values are seen tobe obtained through these simple models. Using RKE in order to model full-coverage filmcooling will yield results with 30% less error than selecting SSTKW.
Book Synopsis Full-coverage Film Cooling on Flat, Isothermal Surfaces: Data and Predictions by :
Download or read book Full-coverage Film Cooling on Flat, Isothermal Surfaces: Data and Predictions written by and published by . This book was released on 1980 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Full-coverage Film Cooling on Flat, Isothermal Surfaces by : Michael E. Crawford
Download or read book Full-coverage Film Cooling on Flat, Isothermal Surfaces written by Michael E. Crawford and published by . This book was released on 1980 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Full-coverage Film Cooling: 3-dimensional Measurements of Turbulence Structure and Prediction of Recovery Region Hydrodynamics by : S. Yavuzkurt (et al)
Download or read book Full-coverage Film Cooling: 3-dimensional Measurements of Turbulence Structure and Prediction of Recovery Region Hydrodynamics written by S. Yavuzkurt (et al) and published by . This book was released on 1977 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrodynamic measurements were made with a triaxial hot-wire in the full-coverage region and the recovery region following an array of injection holes inclined downstream, at 30 degrees to the surface.
Book Synopsis Heat transfer to a full-coverage film-cooled surface with 30 ̊slant-hole injection by : Michael E. Crawford
Download or read book Heat transfer to a full-coverage film-cooled surface with 30 ̊slant-hole injection written by Michael E. Crawford and published by . This book was released on 1976 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heat transfer behavior was studied in a turbulent boundary layer with full coverage film cooling through an array of discrete holes and with injection 30 deg to the wall surface in the downstream direction. Stanton numbers were measured for a staggered hole pattern with pitch-to-diameter ratios of 5 and 10, an injection mass flux ratio range of 0.1 to 1.3, and a range of Reynolds number Re sub x of 150,000 to 5 million. Air was used as the working fluid, and the mainstream velocity varied from 9.8 to 34.2 m/sec (32 to 112 ft/sec). The data were taken for secondary injection temperature equal to the wall temperature and also equal to the mainstream temperature. The data may be used to obtain Stanton number as a continuous function of the injectant temperature by use of linear superposition theory. The heat transfer coefficient is defined on the basis of a mainstream-to-wall temperature difference. This definition permits direct comparison of performance between film cooling and transpiration cooling. A differential prediction method was developed to predict the film cooling data base. The method utilizes a two-dimensional boundary layer program with routines to model the injection process and turbulence augmentation. The program marches in the streamwise direction, and when a row of holes is encountered, it stops and injects fluid into the boundary layer. The turbulence level is modeled by algebraically augmenting the mixing length, with the augmentation keyed to a penetration distance for the injected fluid.--(NTRL site)
Book Synopsis Full-coverage Film Cooling by : S. Yavuzkurt
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:
Book Synopsis Full-coverage Film Cooling by : S. Yavuzkurt
Download or read book Full-coverage Film Cooling written by S. Yavuzkurt and published by . This book was released on 1979 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transport Phenomena In Thermal Control by : Guang-Jyh Hwang
Download or read book Transport Phenomena In Thermal Control written by Guang-Jyh Hwang and published by CRC Press. This book was released on 1989-08-01 with total page 822 pages. Available in PDF, EPUB and Kindle. Book excerpt: A collection of research papers into transport phenomena in thermal control, closely related to several important aspects of cooling technology. Articles provide overviews of current advances and details of individual technologies including electronic and turbine cooling and Marangoni convection.
Book Synopsis Full-coverage Film Cooling by : Stanford University. Thermosciences Division. Thermosciences Division
Download or read book Full-coverage Film Cooling written by Stanford University. Thermosciences Division. Thermosciences Division and published by . This book was released on 1977 with total page 200 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 1989 with total page 956 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Film Cooling on a Convex Wall by : Kokichi Furuhama
Download or read book Film Cooling on a Convex Wall written by Kokichi Furuhama and published by . This book was released on 1983 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Heat Transfer to a Full-coverage, Film-cooled Surface with Compound-angle (30 ̊and 45)̊ Hole Injection by : H. K. Kim
Download or read book Heat Transfer to a Full-coverage, Film-cooled Surface with Compound-angle (30 ̊and 45)̊ Hole Injection written by H. K. Kim and published by . This book was released on 1979 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Film Cooling and Turbine Blade Heat Transfer by :
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 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalog of United States Government Publications by :
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1982 with total page 1094 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1987 with total page 1316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flow Studies of Full-coverage Film Cooling on a Convexly Curved Surface by : Paul Youssefmir
Download or read book Flow Studies of Full-coverage Film Cooling on a Convexly Curved Surface written by Paul Youssefmir and published by . This book was released on 1982 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Turbulent Boundary Layer on a Full-coverage Film-cooled Surface by : H. Choe
Download or read book The Turbulent Boundary Layer on a Full-coverage Film-cooled Surface written by H. Choe and published by . This book was released on 1976 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heat transfer behavior was studied in a turbulent boundary layer with full-coverage film cooling through an array of discrete holes, with injection normal to the wall surface.