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Contribution To The Study Of The 3d Unsteady Flow In A Propeller Turbine
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Book Synopsis Contribution to the Study of the 3D Unsteady Flow in a Propeller Turbine by : Jean-Mathieu Gagnon
Download or read book Contribution to the Study of the 3D Unsteady Flow in a Propeller Turbine written by Jean-Mathieu Gagnon and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse porte sur l'écoulement à l'intérieur d'une turbine de type Hélice. Deux méthodes de mesures ont été utilisées afin de remplir les objectifs de l'étude. La précision des instruments et l'incertitude des mesures effectuées à l'aide d'outils de vélocimétrie laser tels que la vélocimétrie Doppler laser (LDV) et la vélocimétrie par images de particules (PIV) ont été analysées. Trois phénomènes principaux sont étudiés à l'aide du LDV et du PIV. Le premier porte sur le débalancement circonférentiel de l'écoulement dans toute la machine. Le second porte sur les interactions rotor-stator se produisant entre les directrices et les aubes de la roue. Le troisième englobe les écoulements à l'entrée de l'aspirateur, le vortex à charge partielle (torche) et à forte charge ainsi que le sillage des directrices. Une attention particulière est portée sur les fréquences caractéristiques trouvées à l'aide des mesures LDV à cet endroit. Parallèlement aux mesures expérimentales, des simulations numériques ont été effectuées et comparées avec les données expérimentales disponibles. Cette comparaison permet d'améliorer les simulations numériques en posant différentes conditions limites et modèles de turbulence. Une meilleure utilisation et une amélioration des modèles RANS, URANS et LES avec l'utilisation de la base de données expérimentales est discutée dans l'étude. En conclusion à la recherche, le débalancement circonférentiel de l'écoulement est identifié avec les méthodes expérimentales et numériques. Le débalancement est de l'ordre de 10% de la vitesse de référence crête à crête aux avants directrices et est amorti à 5% à l'interface. Le débalancement maximal est de 12% à l'intérieur du cône divergent de l'aspirateur. L'intensité turbulente dans les canaux d'admission a été estimée à 8%. Les résultats expérimentaux ont démontré que les interactions rotor-stator sont faibles à l'intérieur de ce type de machine car il y a une dissipation rapide du sillage des directrices avant la roue. La torche à charge partielle et les recirculations se produisant dans l'aspirateur sont présentées avec leurs effets sur l'efficacité hydraulique et la configuration de l'écoulement. Plusieurs structures et vortex sont identifiés tels que le vortex se produisant dans l'espace en porte-à-faux des directrices, le vortex de bout d'aubes, la torche et les vortex contrarotatifs des canaux d'admission. Une base de donnée a été crée pour des recherches futures portant sur l'écoulement d'une turbine Hélice.
Book Synopsis Numerical Study of Unsteady Flow in High Pressure Turbine of Aircraft Engine by : Iouri N. Chmotine
Download or read book Numerical Study of Unsteady Flow in High Pressure Turbine of Aircraft Engine written by Iouri N. Chmotine and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical and Experimental Studies of 3-D and Unsteady Turbulent Body/Appendage/Propeller Flows by : J. A. Schetz
Download or read book Numerical and Experimental Studies of 3-D and Unsteady Turbulent Body/Appendage/Propeller Flows written by J. A. Schetz and published by . This book was released on 1985 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 3-D, turbulent flowfield produced by a propeller operating in the wake of a variable mesh disk has been studied with numerical solutions of the Reynolds-averaged, Navier-Stokes equations and by detailed experiments in a wind tunnel. The mesh variations of the upstream disk were chosen to produce a simulation of the wake of a streamlined, axisymmetric body with a single, streamlined appendage. Comparisons of measurements and preliminary numerical predictions show good agreement for the velocity profiles behind the propeller. The 3-D flow in the junction between a cylindrical appendage and a hull can produce separation of the trailing portion of the appendage and produces a momentum deficient 3-D boundary layer that is more prone to detachment than the 2-D regions away from the appendage. Detailed measurements of the zero-pressure-gradient boundary layer upstream of an appendage of interest have been made. A procedure has been developed for reducing blockage effects in the test wind tunnel. Keywords: Propeller flowfields; Appendage flows; Numerical solutions of turbulent flows.
Book Synopsis An Experimental Investigation of Steady and Unsteady Flow Field in an Axial Flow Turbine by : M. Zaccaria
Download or read book An Experimental Investigation of Steady and Unsteady Flow Field in an Axial Flow Turbine written by M. Zaccaria and published by . This book was released on 1997 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Unsteady Flow Analysis in a High-work Turbine Stage with Two 3-D Navier Stokes Codes by : C. Hah
Download or read book Unsteady Flow Analysis in a High-work Turbine Stage with Two 3-D Navier Stokes Codes written by C. Hah and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Wind Turbine Aerodynamics and Vorticity-Based Methods by : Emmanuel Branlard
Download or read book Wind Turbine Aerodynamics and Vorticity-Based Methods written by Emmanuel Branlard and published by Springer. This book was released on 2017-04-05 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book introduces the fundamentals of fluid-mechanics, momentum theories, vortex theories and vortex methods necessary for the study of rotors aerodynamics and wind-turbines aerodynamics in particular. Rotor theories are presented in a great level of details at the beginning of the book. These theories include: the blade element theory, the Kutta-Joukowski theory, the momentum theory and the blade element momentum method. A part of the book is dedicated to the description and implementation of vortex methods. The remaining of the book focuses on the study of wind turbine aerodynamics using vortex-theory analyses or vortex-methods. Examples of vortex-theory applications are: optimal rotor design, tip-loss corrections, yaw-models and dynamic inflow models. Historical derivations and recent extensions of the models are presented. The cylindrical vortex model is another example of a simple analytical vortex model presented in this book. This model leads to the development of different BEM models and it is also used to provide the analytical velocity field upstream of a turbine or a wind farm under aligned or yawed conditions. Different applications of numerical vortex methods are presented. Numerical methods are used for instance to investigate the influence of a wind turbine on the incoming turbulence. Sheared inflows and aero-elastic simulations are investigated using vortex methods for the first time. Many analytical flows are derived in details: vortex rings, vortex cylinders, Hill's vortex, vortex blobs etc. They are used throughout the book to devise simple rotor models or to validate the implementation of numerical methods. Several Matlab programs are provided to ease some of the most complex implementations.
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 Periodic Propeller Forces in Unsteady Flow by : Neal Alvin Brown
Download or read book Periodic Propeller Forces in Unsteady Flow written by Neal Alvin Brown and published by . This book was released on 1964 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Unsteady Flow Simulation: A Numerical Challenge by : Francesco Martelli
Download or read book Unsteady Flow Simulation: A Numerical Challenge written by Francesco Martelli and published by . This book was released on 2003 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The prediction of unsteady flow field in turbine blades as well as in the turbomachinery stages is now an affordable item, and is required by the reduced margin for increasing efficiency, stability and life of propulsion components, The numerical tools are now capable to run within reasonable time 3D unsteady calculation for full stage, and the new techniques on the computation and parallel computer allow the improvements of results in terms of cost and accuracy, Despite these advantages many questions remain open and the physical modelling joint with the numerical improvements is still a challenge if it has to produce usable results, compared with the experiments. Aim of this paper is the report on some experience and the attempt to give some answer on that challenge, presenting results of a recent activity on modelling side compared with experiments as well, A full-3D unstructured solver based on an upwind TVD finite volume scheme has been developed and applied to the simulation of an unsteady turbine stage, The development of the numerical strategy is discussed with particular concern on the validation of the unsteady model through a comparison against experiments, NISRE approach and a 3D steady stage computation, The present work considers the application of the fully unstructured hybrid solver for internal viscous flows, as well, The multiblock version of the solver developed for turbine is considered, because of the highly improved performance as compared to the single domain version of the code, Moreover, the high numerical costs involved in 3D unsteady computations required the development of a new parallel single program multiple-data version of the numerical solver. The results compare favorably with a set of time averaged and unsteady experimental data available for the turbine stage under investigation, which is representative of a wide class of aero-engines.
Book Synopsis The Particle Image Velocimetry by : Giovanna Cavazzini
Download or read book The Particle Image Velocimetry written by Giovanna Cavazzini and published by BoD – Books on Demand. This book was released on 2012-05-23 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Particle Image Velocimetry is undoubtedly one of the most important technique in Fluid-dynamics since it allows to obtain a direct and instantaneous visualization of the flow field in a non-intrusive way. This innovative technique spreads in a wide number of research fields, from aerodynamics to medicine, from biology to turbulence researches, from aerodynamics to combustion processes. The book is aimed at presenting the PIV technique and its wide range of possible applications so as to provide a reference for researchers who intended to exploit this innovative technique in their research fields. Several aspects and possible problems in the analysis of large- and micro-scale turbulent phenomena, two-phase flows and polymer melts, combustion processes and turbo-machinery flow fields, internal waves and river/ocean flows were considered.
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1994 with total page 1688 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Three-Dimensional Flow in the Root Region of Wind Turbine Rotors by : Galih Bangga
Download or read book Three-Dimensional Flow in the Root Region of Wind Turbine Rotors written by Galih Bangga and published by kassel university press GmbH. This book was released on 2018-06-20 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the state of the art in the analyses of three-dimensional flow over rotating wind turbine blades. Systematic studies for wind turbine rotors with different sizes were carried out numerically employing three different simulation approaches, namely the Euler, URANS and DDES methods. The main mechanisms of the lift augmentation in the blade inboard region are described in detail. The physical relations between the inviscid and viscous effects are presented and evaluated, emphasizing the influence of the flow curvature on the resulting pressure distributions. Detailed studies concerning the lift augmentation for large wind turbine rotors are considered as thick inboard airfoils characterized by massive separation are desired to stronger contribute to power production. Special attention is given to the analyses of wind turbine loads and flow field that can be helpful for the interpretation of the occurring physical phenomena. The book is aimed at students, researchers, engineers and physicists dealing with wind engineering problems, but also for a wider audience involved in flow computations.
Book Synopsis Simulation of Unsteady 3-D Viscous Compressible Propeller Flow by Finite Element Method by : Wael Taha
Download or read book Simulation of Unsteady 3-D Viscous Compressible Propeller Flow by Finite Element Method written by Wael Taha and published by . This book was released on 2004 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The flow produced by a rotating propeller is inherently unsteady and three-dimensional. Conventional design of propellers uses blade-element theory but becomes inaccurate in capturing three-dimensional vortical and compressible effects at the tips, as well as the effect on downstream bodies. A propeller is always attached to a fixed component that affects its performance, thus the need arises to couple a fixed domain to a rotating domain in an unsteady aerodynamic simulation. A finite element formulation for the simulation of propellers is presented in terms of the Reynolds-averaged Navier-Stokes equations for unsteady, three-dimensional, viscous, compressible flows. The first step consists of preparing a mesh containing two separate domains interfacing at a virtual surface. Then, simulation is run to obtain an initial solution. This step highlights the live/dead interfacing scheme between the fixed and rotating domains without mesh movement. Finally the unsteady simulation performs interpolations at each time step with node movement until a periodic steady state is reached. Mesh movement can be treated by either an ALE formulation or a rotating frame of reference correction. Two test cases are used to validate the code: a two-dimensional pitching airfoil in transonic flow and a 3-bladed 5868-9 propeller with a liquid cooled nacelle." --
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 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1994 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Organisation du traité de l'Atlantique Nord. Groupe consultatif pour la recherche et le développement aérospatial. Technical Information Panel Publisher : ISBN 13 :9789283610199 Total Pages :508 pages Book Rating :4.6/5 (11 download)
Book Synopsis AGARD Index of Publications by : Organisation du traité de l'Atlantique Nord. Groupe consultatif pour la recherche et le développement aérospatial. Technical Information Panel
Download or read book AGARD Index of Publications written by Organisation du traité de l'Atlantique Nord. Groupe consultatif pour la recherche et le développement aérospatial. Technical Information Panel and published by . This book was released on 1995 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Unsteady Flow in Axial Turbines by : Martin George Rose
Download or read book Unsteady Flow in Axial Turbines written by Martin George Rose and published by . This book was released on 2011 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt:
