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Author:
Publisher:
ISBN:
Category : Combustion chambers
Languages : ka
Pages : 70
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Book Description
Author:
Publisher:
ISBN:
Category : Combustion chambers
Languages : ka
Pages : 70
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Book Description
Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781729379301
Category : Science
Languages : en
Pages : 58
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Book Description
Aircraft engine combustors generally involve turbulent swirling flows in order to enhance fuel-air mixing and flame stabilization. It has long been recognized that eddy viscosity turbulence models are unable to appropriately model swirling flows. Therefore, it has been suggested that, for the modeling of these flows, a second order closure scheme should be considered because of its ability in the modeling of rotational and curvature effects. However, this scheme will require solution of many complicated second moment transport equations (six Reynolds stresses plus other scalar fluxes and variances), which is a difficult task for any CFD implementations. Also, this scheme will require a large amount of computer resources for a general combustor swirling flow. This report is devoted to the development of a cubic Reynolds stress-strain model for turbulent swirling flows, and was inspired by the work of Launder's group at UMIST. Using this type of model, one only needs to solve two turbulence equations, one for the turbulent kinetic energy k and the other for the dissipation rate epsilon. The cubic model developed in this report is based on a general Reynolds stress-strain relationship. Two flows have been chosen for model evaluation. One is a fully developed rotating pipe flow, and the other is a more complex flow with swirl and recirculation. Shih, Tsan-Hsing and Zhu, Jiang and Liou, William and Chen, Kuo-Huey and Liu, Nan-Suey and Lumley, John L. Glenn Research Center...
Author:
Publisher:
ISBN:
Category : Turbulence
Languages : en
Pages : 0
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Book Description
Author: G. P. Neitzel
Publisher:
ISBN:
Category :
Languages : en
Pages : 114
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Book Description
Contents: A study of sudden expansion pipe flow using an algebraic-stress model of turbulence; Comment on 'The flowfield in a suddenly enlarged combustion chamber'; Turbulent flow prediction in a sudden axisymmetric expansion; Heat transfer to turbulent swirling flow through a sudden axisymmetric expansion; Measurements in turbulent swirling flow through an abrupt axisymmetric expansion. The first three papers describe numerical predictions of the flowfield; The next describes experimental measurements of local convective heat transfer on the tube walls downstream of expansion; and the last describes detailed mean and fluctuating flowfield measurements both upstream and downstream of the expansion including precessing vortex core phenomena.
Author: Fenando F. Grinstein
Publisher: Cambridge University Press
ISBN: 1107137047
Category : Science
Languages : en
Pages : 481
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Book Description
Reviews our current understanding of the subject. For graduate students and researchers in computational fluid dynamics and turbulence.
Author: Thomas B. Gatski
Publisher: Oxford University Press
ISBN: 0195355563
Category : Science
Languages : en
Pages : 329
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Book Description
This book provides students and researchers in fluid engineering with an up-to-date overview of turbulent flow research in the areas of simulation and modeling. A key element of the book is the systematic, rational development of turbulence closure models and related aspects of modern turbulent flow theory and prediction. Starting with a review of the spectral dynamics of homogenous and inhomogeneous turbulent flows, succeeding chapters deal with numerical simulation techniques, renormalization group methods and turbulent closure modeling. Each chapter is authored by recognized leaders in their respective fields, and each provides a thorough and cohesive treatment of the subject.
Author: Lee Nicholas Jones
Publisher:
ISBN:
Category :
Languages : en
Pages : 480
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Book Description
Author: G. Biswas
Publisher: CRC Press
ISBN: 9780849310140
Category : Technology & Engineering
Languages : en
Pages : 478
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Book Description
This book allows readers to tackle the challenges of turbulent flow problems with confidence. It covers the fundamentals of turbulence, various modeling approaches, and experimental studies. The fundamentals section includes isotropic turbulence and anistropic turbulence, turbulent flow dynamics, free shear layers, turbulent boundary layers and plumes. The modeling section focuses on topics such as eddy viscosity models, standard K-E Models, Direct Numerical Stimulation, Large Eddy Simulation, and their applications. The measurement of turbulent fluctuations experiments in isothermal and stratified turbulent flows are explored in the experimental methods section. Special topics include modeling of near wall turbulent flows, compressible turbulent flows, and more.
Author: Liang-jy Leu
Publisher:
ISBN:
Category : Boundary layer turbulence
Languages : en
Pages : 186
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Book Description
Author: Lixing Zhou
Publisher: Butterworth-Heinemann
ISBN: 0128134666
Category : Technology & Engineering
Languages : en
Pages : 343
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Book Description
Theory and Modeling of Dispersed Multiphase Turbulent Reacting Flows gives a systematic account of the fundamentals of multiphase flows, turbulent flows and combustion theory. It presents the latest advances of models and theories in the field of dispersed multiphase turbulent reacting flow, covering basic equations of multiphase turbulent reacting flows, modeling of turbulent flows, modeling of multiphase turbulent flows, modeling of turbulent combusting flows, and numerical methods for simulation of multiphase turbulent reacting flows, etc. The book is ideal for graduated students, researchers and engineers in many disciplines in power and mechanical engineering. Provides a combination of multiphase fluid dynamics, turbulence theory and combustion theory Covers physical phenomena, numerical modeling theory and methods, and their applications Presents applications in a wide range of engineering facilities, such as utility and industrial furnaces, gas-turbine and rocket engines, internal combustion engines, chemical reactors, and cyclone separators, etc.
