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Author : Martin Leslie
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (595 download)
Download or read book Experimental and Computational Investigation of Sub-boundary Layer Vortex Generators written by Martin Leslie and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronaut Administration (Nasa)
Publisher :
ISBN 13 :
Total Pages : 32 pages
Book Rating : 4.6/5 (711 download)
Download or read book Boundary Layer Flow Control by an Array of Ramp-Shaped Vortex Generators written by National Aeronaut Administration (Nasa) and published by . This book was released on 2020-08-03 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow field survey results for the effect of ramp-shaped vortex generators (VG) on a turbulent boundary layer are presented. The experiments are carried out in a low-speed wind tunnel and the data are acquired primarily by hot-wire anemometry. Distributions of mean velocity and turbulent stresses as well as streamwise vorticity, on cross-sectional planes at various downstream locations, are obtained. These detailed flow field properties, including the boundary layer characteristics, are documented with the primary objective of aiding possible computational investigations. The results show that VG orientation with apex upstream, that produces a downwash directly behind it, yields a stronger pair of streamwise vortices. This is in contrast to the case with apex downstream that produces a pair of vortices of opposite sense. Thus, an array of VG s with the former orientation, usually considered for film-cooling application, may also be superior for mixing enhancement and boundary layer separation control. (See CASI ID 20120009374 for Supplemental CD-ROM.) Zaman, K. B. M. Q. and Hirt, S. M. and Bencic, T. J. Glenn Research Center NASA/TM-2012-217437, E-18130 WBS 561581.02.08.03.47.06.03 VORTEX GENERATORS; VORTICITY; TURBULENT BOUNDARY LAYER; WIND TUNNEL TESTS; BOUNDARY LAYER SEPARATION; FLOW DISTRIBUTION; VELOCITY MEASUREMENT; UPSTREAM; DOWNWASH; LOW SPEED
Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
ISBN 13 : 9781793967527
Total Pages : 34 pages
Book Rating : 4.9/5 (675 download)
Download or read book Boundary Layer Flow Control by an Array of Ramp-Shaped Vortex Generators written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2019-01-13 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow field survey results for the effect of ramp-shaped vortex generators (VG) on a turbulent boundary layer are presented. The experiments are carried out in a low-speed wind tunnel and the data are acquired primarily by hot-wire anemometry. Distributions of mean velocity and turbulent stresses as well as streamwise vorticity, on cross-sectional planes at various downstream locations, are obtained. These detailed flow field properties, including the boundary layer characteristics, are documented with the primary objective of aiding possible computational investigations. The results show that VG orientation with apex upstream, that produces a downwash directly behind it, yields a stronger pair of streamwise vortices. This is in contrast to the case with apex downstream that produces a pair of vortices of opposite sense. Thus, an array of VG s with the former orientation, usually considered for film-cooling application, may also be superior for mixing enhancement and boundary layer separation control. (See CASI ID 20120009374 for Supplemental CD-ROM.) Zaman, K. B. M. Q. and Hirt, S. M. and Bencic, T. J. Glenn Research Center NASA/TM-2012-217437, E-18130
Author :
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (317 download)
Download or read book A Computational-Experimental Development of Vortex Generator Use for a Transitioning S-Diffuser written by and published by . This book was released on 1996 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781720378921
Total Pages : 32 pages
Book Rating : 4.3/5 (789 download)
Download or read book An Empirical Model for Vane-Type Vortex Generators in a Navier-Stokes Code written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-29 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: An empirical model which simulates the effects of vane-type vortex generators in ducts was incorporated into the Wind-US Navier-Stokes computational fluid dynamics code. The model enables the effects of the vortex generators to be simulated without defining the details of the geometry within the grid, and makes it practical for researchers to evaluate multiple combinations of vortex generator arrangements. The model determines the strength of each vortex based on the generator geometry and the local flow conditions. Validation results are presented for flow in a straight pipe with a counter-rotating vortex generator arrangement, and the results are compared with experimental data and computational simulations using a gridded vane generator. Results are also presented for vortex generator arrays in two S-duct diffusers, along with accompanying experimental data. The effects of grid resolution and turbulence model are also examined.Dudek, Julianne C.Glenn Research CenterNAVIER-STOKES EQUATION; TURBULENCE MODELS; VORTEX GENERATORS; AIR BREATHING ENGINES; BOUNDARY LAYER CONTROL; DUCTED FLOW; PIPE FLOW; COUNTER ROTATION
Author : Nasa Technical Reports Server (Ntrs)
Publisher : BiblioGov
ISBN 13 : 9781289168520
Total Pages : 36 pages
Book Rating : 4.1/5 (685 download)
Download or read book Boundary Layer Flow Control by an Array of Ramp-Shaped Vortex Generators written by Nasa Technical Reports Server (Ntrs) and published by BiblioGov. This book was released on 2013-07 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow field survey results for the effect of ramp-shaped vortex generators (VG) on a turbulent boundary layer are presented. The experiments are carried out in a low-speed wind tunnel and the data are acquired primarily by hot-wire anemometry. Distributions of mean velocity and turbulent stresses as well as streamwise vorticity, on cross-sectional planes at various downstream locations, are obtained. These detailed flow field properties, including the boundary layer characteristics, are documented with the primary objective of aiding possible computational investigations. The results show that VG orientation with apex upstream, that produces a downwash directly behind it, yields a stronger pair of streamwise vortices. This is in contrast to the case with apex downstream that produces a pair of vortices of opposite sense. Thus, an array of VG s with the former orientation, usually considered for film-cooling application, may also be superior for mixing enhancement and boundary layer separation control.
Author : Martin Kiran Rao
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (63 download)
Download or read book An Experimental Investigation of the Use of Air Jet Vortex Generators to Control Shock Induced Boundary Layer Separation written by Martin Kiran Rao and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Dale L. Ashby
Publisher :
ISBN 13 :
Total Pages : 164 pages
Book Rating : 4.:/5 (317 download)
Download or read book Experimental and Computational Investigation of Lift-enhancing Tabs on a Multi-element Airfoil written by Dale L. Ashby and published by . This book was released on 1996 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Shaofan Li
Publisher : Springer Nature
ISBN 13 : 3031425154
Total Pages : 1358 pages
Book Rating : 4.0/5 (314 download)
Download or read book Computational and Experimental Simulations in Engineering written by Shaofan Li and published by Springer Nature. This book was released on with total page 1358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : P. R. Ashill
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Research at DERA on Sub-boundary Layer Vortex Generators written by P. R. Ashill and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Victor Zakkay
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.:/5 (31 download)
Download or read book An Experimental Investigation of Vortex Generation in a Turbulent Boundary Layer Undergoing Adverse Pressure Gradient written by Victor Zakkay and published by . This book was released on 1972 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Robert A. Dinovo
Publisher :
ISBN 13 :
Total Pages : 232 pages
Book Rating : 4.:/5 (494 download)
Download or read book An Investigation Into the Modeling of Sub-boundary-layer Vortex Generators written by Robert A. Dinovo and published by . This book was released on 2001 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: New analytic models for the initial shed vortex circulation generated by rectangular and right-triangular vane type sub-boundary-layer vortex generators have been developed.
Download or read book Investigation of a Sub Boundary Layer Vortex Generator for the Control of Separation in Boundary Layer-shock Wave Interaction written by and published by . This book was released on 2007 with total page 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 :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (946 download)
Download or read book Characterization of Pulsed Vortex Generator Jets for Active Flow Control written by and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The flowfields produced by several active and passive flow control devices are being investigated experimentally and numerically as part of co-operative effort between the US Air Force Research Laboratory and the UK's Defense Evaluation & Research Agency (DERA). This manuscript reports the results of an experimental investigation of pulsed vortex generator jets (PVGJs) conducted at DERA's Boundary Layer Facility in Bedford. The focus of these tests was to investigate the influence of jet velocity, pulsing frequency, and duty cycle on the mean characteristics of the flowfield produced by a PVGJ in a turbulent boundary layer. The experiments were conducted in a zero-pressure-gradient flow at a freestream velocity of 32 m/s. The flowfield was explored using a three-component laser Doppler anemometry system, and the information is used to calculate local field properties such as velocity and vorticity as well as global parameters like total circulation. The data give insight into the effectiveness of the VOs in terms of location, strength, and persistence of the generated vortices and their influence on the boundary layer. While the planned computational simulation effort is in its infancy, preliminary steady-jet computational results are compared with the flow field data that has been acquired in the boundary layer facility.
Author : Michael Klaas
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Experimental and Computational Investigation of Oblique Shock-vortex Interaction written by Michael Klaas and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 702 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
