Full Coverage Film Cooling On Flat Isothermal Surfaces Data And Predictions
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Full Coverage Film Cooling On Flat Isothermal Surfaces Data And Predictions
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Author :
language : en
Publisher:
Release Date : 1980
Full Coverage Film Cooling On Flat Isothermal Surfaces Data And Predictions written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with categories.
Full Coverage Film Cooling On Flat Isothermal Surfaces
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Author : Michael E. Crawford
language : en
Publisher:
Release Date : 1980
Full Coverage Film Cooling On Flat Isothermal Surfaces written by Michael E. Crawford and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Boundary layer categories.
Surface Measurements And Predictions Of Full Coverage Film Cooling
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Author : Greg Natsui
language : en
Publisher:
Release Date : 2012
Surface Measurements And Predictions Of Full Coverage Film Cooling written by Greg Natsui and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
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.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1985
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Aeronautics categories.
Film Cooling And Turbine Blade Heat Transfer
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Author :
language : en
Publisher:
Release Date : 1982
Film Cooling And Turbine Blade Heat Transfer written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Aircraft gas-turbines categories.
Asme Technical Papers
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Author :
language : en
Publisher:
Release Date : 2001
Asme Technical Papers written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Mechanical engineering categories.
Paper
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Author :
language : en
Publisher:
Release Date : 2001
Paper written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Mechanical engineering categories.
Film Cooling On A Convex Wall
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Author : Kokichi Furuhama
language : en
Publisher:
Release Date : 1983
Film Cooling On A Convex Wall written by Kokichi Furuhama and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Turbines categories.
Monthly Catalogue United States Public Documents
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Author :
language : en
Publisher:
Release Date : 1982
Monthly Catalogue United States Public Documents written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Government publications categories.
Monthly Catalog Of United States Government Publications
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Author :
language : en
Publisher:
Release Date : 1982
Monthly Catalog Of United States Government Publications written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Government publications categories.