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Improvements To Temperature Predictions Of Film Cooled Solids Using Iterative Conjugate Heat Transfer And Reduced Order Film Modeling
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Book Synopsis Improvements to Temperature Predictions of Film Cooled Solids Using Iterative Conjugate Heat Transfer and Reduced Order Film Modeling by : Peter Ingram
Download or read book Improvements to Temperature Predictions of Film Cooled Solids Using Iterative Conjugate Heat Transfer and Reduced Order Film Modeling written by Peter Ingram and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: To accurately predict the life of turbine blade, accurate temperature predictions are necessary. It is widely accepted that the life of a turbine blade can be reduced by half if the temperature prediction of the metal blade is off by only 30°C. This paper extends Iterative Conjugate Heat Transfer (ICHT) and Reduced Order Film Modeling (ROFM) to include spanwise variation in film cooling parameters by developing a model to extend the spanwise-averaged correlations into two-dimensional correlations, implement a superposition model for multiple row injection, and implement a model for coolant warming to increase the accuracy of these temperature predictions. Three-dimensional temperature distributions in film cooled solids are calculated using ICHT-ROFM. ICHT is used to obtain conjugate temperature profiles using a loosely coupled system. The convective heat transfer is calculated on a similar blade without film-cooling while under the same flow conditions. The heat transfer coefficients are corrected by use of experimental data or correlations to incorporate the effect of film-cooling on the heat transfer coefficients. This is called Reduced Order Film Cooling (ROFM). ROFM needs experimental input for film cooling effectiveness and film heat transfer coefficients. The developed correlations were used to predict the temperature downstream from a cooling hole for various conductivity and plate thicknesses for both spanwise averaged cooling parameters (1D) and spanwise varied parameters (2D). It was found that the spanwise averaged calculations underpredict temperatures, relative to the new model, by around 4% for Biot values similar to first row cooling holes in turbine blade applications. Coolant warming was also accounted for and implemented in ICHT-ROFM method. It was found that coolant warming through the cooling holes causes about a 1% increase in surface temperatures for the case considered. While not significant, it is expected that in turbine applications, the coolant warming will be more significant, leading to larger increases in surface temperature.
Book Synopsis Film Cooling Calculations with an Iterative Conjugate Heat Transfer Approach Using Empirical Heat Transfer Coefficient Corrections by : Sushant Dhiman
Download or read book Film Cooling Calculations with an Iterative Conjugate Heat Transfer Approach Using Empirical Heat Transfer Coefficient Corrections written by Sushant Dhiman and published by . This book was released on 2010 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Applications of Mathematical Heat Transfer and Fluid Flow Models in Engineering and Medicine by : Abram S. Dorfman
Download or read book Applications of Mathematical Heat Transfer and Fluid Flow Models in Engineering and Medicine written by Abram S. Dorfman and published by John Wiley & Sons. This book was released on 2017-02-06 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applications of mathematical heat transfer and fluid flow models in engineering and medicine Abram S. Dorfman, University of Michigan, USA Engineering and medical applications of cutting-edge heat and flow models This book presents innovative efficient methods in fluid flow and heat transfer developed and widely used over the last fifty years. The analysis is focused on mathematical models which are an essential part of any research effort as they demonstrate the validity of the results obtained. The universality of mathematics allows consideration of engineering and biological problems from one point of view using similar models. In this book, the current situation of applications of modern mathematical models is outlined in three parts. Part I offers in depth coverage of the applications of contemporary conjugate heat transfer models in various industrial and technological processes, from aerospace and nuclear reactors to drying and food processing. In Part II the theory and application of two recently developed models in fluid flow are considered: the similar conjugate model for simulation of biological systems, including flows in human organs, and applications of the latest developments in turbulence simulation by direct solution of Navier-Stokes equations, including flows around aircraft. Part III proposes fundamentals of laminar and turbulent flows and applied mathematics methods. The discussion is complimented by 365 examples selected from a list of 448 cited papers, 239 exercises and 136 commentaries. Key features: Peristaltic flows in normal and pathologic human organs. Modeling flows around aircraft at high Reynolds numbers. Special mathematical exercises allow the reader to complete expressions derivation following directions from the text. Procedure for preliminary choice between conjugate and common simple methods for particular problem solutions. Criterions of conjugation, definition of semi-conjugate solutions. This book is an ideal reference for graduate and post-graduate students and engineers.
Book Synopsis Film-cooled Gas Turbine Vane Temperature Calculations with an Iterative Conjugate Heat Transfer Approach Using Empirical Film Correlations by : Timothy Jennings
Download or read book Film-cooled Gas Turbine Vane Temperature Calculations with an Iterative Conjugate Heat Transfer Approach Using Empirical Film Correlations written by Timothy Jennings and published by . This book was released on 2011 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Paper written by and published by . This book was released on 2000 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ASME Technical Papers written by and published by . This book was released on 2000 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Inelastic Behavior of Materials and Structures Under Monotonic and Cyclic Loading by : Holm Altenbach
Download or read book Inelastic Behavior of Materials and Structures Under Monotonic and Cyclic Loading written by Holm Altenbach and published by Springer. This book was released on 2015-02-03 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents studies on the inelastic behavior of materials and structures under monotonic and cyclic loads. It focuses on the description of new effects like purely thermal cycles or cases of non-trivial damages. The various models are based on different approaches and methods and scaling aspects are taken into account. In addition to purely phenomenological models, the book also presents mechanisms-based approaches. It includes contributions written by leading authors from a host of different countries.
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 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 1995 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanistic Analysis and Reduced Order Modeling of Forced Film Cooling Flows by : Guillaume Francois Bidan
Download or read book Mechanistic Analysis and Reduced Order Modeling of Forced Film Cooling Flows written by Guillaume Francois Bidan and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Journal of Thermophysics and Heat Transfer by :
Download or read book Journal of Thermophysics and Heat Transfer written by and published by . This book was released on 1993 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Calculation Method for Convective Heat and Mass Transfer in Multiply-slotted Film-cooling Applications by : S. B. Murray
Download or read book A Calculation Method for Convective Heat and Mass Transfer in Multiply-slotted Film-cooling Applications written by S. B. Murray and published by 1980.. This book was released on 1980 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: A computer model to calculate the development of wall jet boundary layers downstream of multiple film-cooling slots is described. The differential equations for the conservation of mass, momentum and energy in an incompressible two-dimensional for axisymmetric flow are solved using a downstream-marching, iterative, implicit, finite-difference scheme. The turbulent transport of mass in a conventional wall boundary layer is described by means of inner-outer two-layer eddy-viscosity model based on the Prandtl mixing-length hypothesis with Van Driest's modification in the near-wall region. Further alterations to include the effects of pressure gradients, heat and mass transfer are due to Cebeci and Smith. This basic model is extended to include cases with tangential fluid injection. Computed velocity profiles indicate that the law of the wall is obeyed in the inner layer and that the outer wake-like layer strives to resume the velocity-defect relationship that existed upstream of the point of fluid injection in zero pressure-gradient flow with no heat or mass transfer. Comparison between computed and experimental adiabatic wall temperature distributions in flows with heat transfer shows that the eddy-viscosity model is deficient in the near-slot region and tends to overestimate film-cooling efficiency. The absence of an eddy term to account for turbulence due to finite slot lip thickness is partly responsible for this overestimation. Recommendations are made to validate the model in pressure-gradient flows and to improve the predictive capability in the near-slot region. (Author).
Book Synopsis Flow and Heat Transfer Predictions for Film-Cooling Flows Using Large Eddy Simulations by : Mayank Tyagi
Download or read book Flow and Heat Transfer Predictions for Film-Cooling Flows Using Large Eddy Simulations written by Mayank Tyagi and published by . This book was released on 2001 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Large eddy simulations are performed to study the flow physics and heat transfer for the film-cooling of gas turbine blade surface. The coolant jet issues out from a cylindrical delivery tube into the mainflow at an inclination angle of 35 degrees. The Reynolds number based on the jet velocity and the diameter of the delivery tube is approximately 11100. The jet to mainflow velocity ratio is 0.5. Heat transfer calculations are also performed simultaneously to study the mixing of the passive scalar with the mainflow, evaluate film-cooling effectiveness and heat transfer predictions on the blade surface. The parameters in the simulation correspond to the experiments performed at UTRC (Lavrich and Chiappetta, 1990).
Book Synopsis Effects of Upstream Synfuel Deposition on Film Cooling Effectiveness and Convective Heat Transfer Coefficient Near Industrial Gas Turbine Film Cooling Holes by : Scott Dudley Lewis
Download or read book Effects of Upstream Synfuel Deposition on Film Cooling Effectiveness and Convective Heat Transfer Coefficient Near Industrial Gas Turbine Film Cooling Holes written by Scott Dudley Lewis and published by . This book was released on 2008 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: An experimental film cooling study was performed to understand heat transfer effects due to upstream synfuel deposition. A scaled up model incorporating actual synfuel deposition topography was used. The model contained six cylindrical holes inclined at 300. A flat model with the same film cooling hole geometry was used for comparison. An infrared camera was used to obtain both the film cooling effectiveness from a steady state test and heat transfer coefficient from a transient test. The roughness model had deposition valleys along the centerline of the holes, which caused the flow to accelerate around the peaks and helped to keep the coolant jet down on the surface. This flow acceleration caused large film cooling effectiveness improvements for the 1 and 1.5 blowing ratio cases. The heat transfer coefficient showed both cooling benefits as well as cooling losses due to deposit roughness. The roughness model showed no kidney vortices as opposed to the flat model, which produced a beneficial localized reduction in heat transfer coefficient around the film cooling holes. Although a sharp detrimental rise in heat transfer coefficient occurred on the rough model for the 1.5 blowing ratio case. The heat flux ratio shows the overall cooling effect and a substantial cooling benefit compared to the flat model occurred at blowing ratios of 1 and 1.5. It is concluded that the film cooling effects of upstream deposition on actual turbine blades can be highly beneficial.
