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Author : William Rane Nolan
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (16 download)
Download or read book A Study of Vortex Generator Behavior written by William Rane Nolan and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 50 pages
Book Rating : 4.:/5 (317 download)
Download or read book Initial Circulation and Peak Vorticity Behavior of Vortices Shed from Airfoil Vortex Generators written by and published by . This book was released on 2001 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Unai Fernández Gámiz
Publisher :
ISBN 13 :
Total Pages : 127 pages
Book Rating : 4.:/5 (112 download)
Download or read book Fluid Dynamic Characterization of Vortex Generators and Two-dimensional Turbulent Wakes written by Unai Fernández Gámiz and published by . This book was released on 2014 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this PhD thesis is the fluid dynamic characterization of the flow behind vortex generators (VG) as well as to investigate their influence in the separation of the boundary layer. CFD simulations have been carried out for the analysis of the flow downstream a single vortex generator on a flat plate. In order to evaluate the induced flow effect of the VG, a test case of a single rectangular VG has been designed and the flow have been numerically simulated and analyzed. Three-Dimensional steady state simulations at low Reynolds number have been performed using EllipSys3D CFD code and the computational results have been compared with experimental data. The self-similar behavior and the helical symmetry on the VG induced flow have been studied. The computations have demonstrated considerable reliability when reproducing the physics of the VG by a rectangular vortex generator. Furthermore, a detailed analysis of the equilibrium parameters has been made on a two-dimensional turbulent wake in two different test cases: a twin-plate and a symmetric airfoil (NACA0012). Both cases have been numerically analyzed and the computational results have been compared with experimental observations. The self-similar behaviour on the wake generated by a twin-plate and a symmetric airfoil has been tested and the CFD results match the experimental observations reasonably well.This thesis has been divided into five main parts:PART I. In this part is presented the importance of this research as well as the main motivation to carry out such work. An extensive description of the state of the art on vortex generators models is presented with high emphasis on wind turbine applications. Further, a very detailed explanation of the state of the art on self-similarity and on two-dimensional turbulent wake equilibrium is given.PART II. The three chapters of this part comprise the foundation of this thesis. In this part there is a detailed description of the vortex generator models used in this research, as well as a comparison of the computational results with the wind tunnel experiments carried out by Clara M. Velte, as a validation tool of the computations. The implementation of the BAY model into the EllipSys CFD code is described in Chapter 5 and it was performed in conjunction with N.N. S?rensen and P.E. Rethore. Finally a parametric study of the device angle dependency of a single VG on a flat plate is described in Chapter 7. Four different angles of attack have been selected for this parametric study: 20o, 25o, 30o and 35o.PART III. In this part, a self-similarity analysis has been made on a single rectangular VG on a flat plate. The simulations were able to capture the helical behaviour of the vortex generator wake with good accuracy when comparing with the experimental data. A very detailed description of the downstream evolution of the helical parameters in the computations is presented in this chapter 8 and compared with experimental results.
Author : Bengt Sundén
Publisher : WIT Press
ISBN 13 : 1845646568
Total Pages : 365 pages
Book Rating : 4.8/5 (456 download)
Download or read book Introduction to Heat Transfer written by Bengt Sundén and published by WIT Press. This book was released on 2012 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting the basic mechanisms for transfer of heat, this book gives a deeper and more comprehensive view than existing titles on the subject. Derivation and presentation of analytical and empirical methods are provided for calculation of heat transfer rates and temperature fields as well as pressure drop. The book covers thermal conduction, forced and natural laminar and turbulent convective heat transfer, thermal radiation including participating media, condensation, evaporation and heat exchangers. This book is aimed to be used in both undergraduate and graduate courses in heat transfer and thermal engineering. It can successfully be used in R & D work and thermal engineering design in industry and by consultancy firms
Author : B. J. Wendt
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Initial Peak Vorticity Behavior for Vortices Shed from Airfoil Vortex Generators written by B. J. Wendt and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Holger Babinsky
Publisher : Cambridge University Press
ISBN 13 : 1139498649
Total Pages : 481 pages
Book Rating : 4.1/5 (394 download)
Download or read book Shock Wave-Boundary-Layer Interactions written by Holger Babinsky and published by Cambridge University Press. This book was released on 2011-09-12 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shock wave-boundary-layer interaction (SBLI) is a fundamental phenomenon in gas dynamics that is observed in many practical situations, ranging from transonic aircraft wings to hypersonic vehicles and engines. SBLIs have the potential to pose serious problems in a flowfield; hence they often prove to be a critical - or even design limiting - issue for many aerospace applications. This is the first book devoted solely to a comprehensive, state-of-the-art explanation of this phenomenon. It includes a description of the basic fluid mechanics of SBLIs plus contributions from leading international experts who share their insight into their physics and the impact they have in practical flow situations. This book is for practitioners and graduate students in aerodynamics who wish to familiarize themselves with all aspects of SBLI flows. It is a valuable resource for specialists because it compiles experimental, computational and theoretical knowledge in one place.
Author : Glen A. Mitchell
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.:/5 (31 download)
Download or read book Performance of Centerbody Vortex Generators in an Axisymmetric Mixed-compression Inlet at Mach Numbers from 2.0 to 3.0 written by Glen A. Mitchell and published by . This book was released on 1968 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781719382908
Total Pages : 26 pages
Book Rating : 4.3/5 (829 download)
Download or read book Modeling Vortex Generators in the Wind-Us Code written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-20 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: A source term model which simulates the effects of vortex generators was implemented into the Wind-US Navier Stokes code. The source term added to the Navier-Stokes equations simulates the lift force which would result from a vane-type vortex generator in the flowfield. The implementation is user-friendly, requiring the user to specify only three quantities for each desired vortex generator: the range of grid points over which the force is to be applied and the planform area and angle of incidence of the physical vane. The model behavior was evaluated for subsonic flow in a rectangular duct with a single vane vortex generator, supersonic flow in a rectangular duct with a counterrotating vortex generator pair, and subsonic flow in an S-duct with 22 co-rotating vortex generators. The validation results indicate that the source term vortex generator model provides a useful tool for screening vortex generator configurations and gives comparable results to solutions computed using a gridded vane. Dudek, Julianne C. Glenn Research Center NAVIER-STOKES EQUATION; VANES; VORTEX GENERATORS; COMPUTATIONAL FLUID DYNAMICS; INLET FLOW; SUPERSONIC INLETS; LIFT; SUBSONIC FLOW
Author : Maged Marghany
Publisher : Elsevier
ISBN 13 : 0128209259
Total Pages : 464 pages
Book Rating : 4.1/5 (282 download)
Download or read book Nonlinear Ocean Dynamics written by Maged Marghany and published by Elsevier. This book was released on 2021-02-09 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonlinear Ocean Dynamics: Synthetic Aperture Radar delivers the critical tools needed to understand the latest technology surrounding the radar imaging of nonlinear waves, particularly microwave radar, as a main source to understand, analyze and apply concepts in the field of ocean dynamic surface. Filling the gap between modern physics quantum theory and applications of radar imaging of ocean dynamic surface, this reference is packed with technical details associated with the potentiality of synthetic aperture radar (SAR). The book also includes key methods needed to extract the value-added information necessary, such as wave spectra energy, current pattern velocity, internal waves, and more. This book also reveals novel speculation of a shallow coastal front: named as Quantized Marghany's Front. Rounding out with practical simulations of 4-D wave-current interaction patterns using using radar images, the book brings an effective new source of technology and applications for today's coastal scientists and engineers. - Solves specific problems surrounding the nonlinearity of ocean surface dynamics in synthetic aperture radar data - Helps develop new algorithms for retrieving ocean wave spectra and ocean current movements from synthetic aperture radar - Includes over 100 equations that illustrate how to follow examples in the book
Author : Jinjun Wang
Publisher : Cambridge University Press
ISBN 13 : 1107161568
Total Pages : 293 pages
Book Rating : 4.1/5 (71 download)
Download or read book Flow Control Techniques and Applications written by Jinjun Wang and published by Cambridge University Press. This book was released on 2019 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: Master the theory, applications and control mechanisms of flow control techniques.
Author : Chaoqun Liu
Publisher : Academic Press
ISBN 13 : 0128190248
Total Pages : 458 pages
Book Rating : 4.1/5 (281 download)
Download or read book Liutex and Its Applications in Turbulence Research written by Chaoqun Liu and published by Academic Press. This book was released on 2020-10-29 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liutex and Its Applications in Turbulence Research reviews the history of vortex definition, provides an accurate mathematical definition of vortices, and explains their applications in flow transition, turbulent flow, flow control, and turbulent flow experiments. The book explains the term "Rortex" as a mathematically defined rigid rotation of fluids or vortex, which could help solve many longstanding problems in turbulence research. The accurate mathematical definition of the vortex is important in a range of industrial contexts, including aerospace, turbine machinery, combustion, and electronic cooling systems, so there are many areas of research that can benefit from the innovations described here. This book provides a thorough survey of the latest research in generalized and flow-thermal, unified, law-of-the-wall for wall-bounded turbulence. Important theory and methodologies used for developing these laws are described in detail, including: the classification of the conventional turbulent boundary layer concept based on proper velocity scaling; the methodology for identification of the scales of velocity, temperature, and length needed to establish the law; and the discovery, proof, and strict validations of the laws, with both Reynolds and Prandtl number independency properties using DNS data. The establishment of these statistical laws is important to modern fluid mechanics and heat transfer research, and greatly expands our understanding of wall-bounded turbulence. Provides an accurate mathematical definition of vortices Provides a thorough survey of the latest research in generalized and flow-thermal, unified, law-of-the-wall for wall-bounded turbulence Explains the term “Rortex as a mathematically defined rigid rotation of fluids or vortex Covers the statistical laws important to modern fluid mechanics and heat transfer research, and greatly expands our understanding of wall-bounded turbulence
Author : J.E. Hesselgreaves
Publisher : Elsevier
ISBN 13 : 0080529542
Total Pages : 417 pages
Book Rating : 4.0/5 (85 download)
Download or read book Compact Heat Exchangers written by J.E. Hesselgreaves and published by Elsevier. This book was released on 2001-05-08 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the ideas and industrial concepts in compact heat exchanger technology that have been developed in the last 10 years or so. Historically, the development and application of compact heat exchangers and their surfaces has taken place in a piecemeal fashion in a number of rather unrelated areas, principally those of the automotive and prime mover, aerospace, cryogenic and refrigeration sectors. Much detailed technology, familiar in one sector, progressed only slowly over the boundary into another sector. This compartmentalisation was a feature both of the user industries themselves, and also of the supplier, or manufacturing industries. These barriers are now breaking down, with valuable cross-fertilisation taking place. One of the industrial sectors that is waking up to the challenges of compact heat exchangers is that broadly defined as the process sector. If there is a bias in the book, it is towards this sector. Here, in many cases, the technical challenges are severe, since high pressures and temperatures are often involved, and working fluids can be corrosive, reactive or toxic. The opportunities, however, are correspondingly high, since compacts can offer a combination of lower capital or installed cost, lower temperature differences (and hence running costs), and lower inventory. In some cases they give the opportunity for a radical re-think of the process design, by the introduction of process intensification (PI) concepts such as combining process elements in one unit. An example of this is reaction and heat exchange, which offers, among other advantages, significantly lower by-product production.To stimulate future research, the author includes coverage of hitherto neglected approaches, such as that of the Second Law (of Thermodynamics), pioneered by Bejan and co- workers. The justification for this is that there is increasing interest in life-cycle and sustainable approaches to industrial activity as a whole, often involving exergy (Second Law) analysis. Heat exchangers, being fundamental components of energy and process systems, are both savers and spenders of exergy, according to interpretation.
Author : Steven M. Klausmeyer
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book A Flow Physics Study of Vortex Generators on a Multi-element Airfoil written by Steven M. Klausmeyer and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Gregory Scott Benham
Publisher :
ISBN 13 :
Total Pages : 82 pages
Book Rating : 4.:/5 (142 download)
Download or read book Numerical Studies of Vortex Generator Aerodynamics written by Gregory Scott Benham and published by . This book was released on 1986 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : American Society of Mechanical Engineers. Fluids Engineering Division
Publisher :
ISBN 13 :
Total Pages : 1092 pages
Book Rating : 4.E/5 ( download)
Download or read book Proceedings of the ASME Fluids Engineering Division Summer Conference, 2006: Forums written by American Society of Mechanical Engineers. Fluids Engineering Division and published by . This book was released on 2006 with total page 1092 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yusi Shih
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (71 download)
Download or read book Mean Pressure Measurements of Micro-vortex Generator at Mach 2.5 written by Yusi Shih and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Shock wave/boundary layer interactions (SBLIs) are always an important issue for high-speed vehicles. SBLIs reduce the performance of aerodynamic surfaces and engine inlets, amongst a number of adverse e ects. Micro-vortex generators (MVGs) are a potential ow control method that has seen intense investigation recently and have even been implemented in actual con gurations at low speeds. The present research is focused on the mean pressures at Mach 2.5 around an MVG. Experiments were performed with a baseline at plate and also with two MVG con gurations (70 and 45 trailing edge) mounted ahead of a 5 ramp. In the present study MVGs are used to manipulated the ow within the boundary layer and the e ects on the weak oblique shock produced by the 5 ramp are recorded. The results appeared similar to the large eddy simulations reported by Li and Liu [1] and [2]. Three conclusions can be made in present research 1. The di erent behaviors of SBLI, with MVG and without MVG, were observed from mean pressure measurements. 2. The mean pressure right behind MVG is lower, compared to the mean pressure in the middle of two MVGs. 3. The trailing angle of the MVG does a ect the mean pressure distribution.
Author : Thomas Walker Glade
Publisher :
ISBN 13 :
Total Pages : 114 pages
Book Rating : 4.:/5 (343 download)
Download or read book A study of vortex generator wakes in super-sonic flow employing a laser power vapor screen flow visualization technique written by Thomas Walker Glade and published by . This book was released on 1974 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
