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An Experimental Study Of Base Drag Reduction Of A Bluff Body
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Book Synopsis An Experimental Study of Base Drag Reduction of a Bluff Body by : James E. Knight
Download or read book An Experimental Study of Base Drag Reduction of a Bluff Body written by James E. Knight and published by . This book was released on 2004 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study to explore the base-drag reduction with passive control means, to determine the effects of boundary-layer displacement thickness and shape factor at the trailing edge, and to understand vortex dynamics and its suction effects using the phase-averaged pressure.
Book Synopsis Experimental Study of Near Wake Dynamics Associated with Bluff Body Base Drag Reduction by : Vibhav Durgesh
Download or read book Experimental Study of Near Wake Dynamics Associated with Bluff Body Base Drag Reduction written by Vibhav Durgesh and published by . This book was released on 2008 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: This investigation studies in detail the changes occurring in near wake dynamics associated with base drag reduction on bluff bodies achieved via boundary layer modification. A wedge model and a flat plate model are used to study bluff bodies over a range of Reynolds number of 0.8 x 10 6 -0.3 x 10 6 . The boundary layer on both these models is modified using fore-body surface roughness, by applying sand grains with a mean diameter of 2.2 mm to their fore-body surfaces. Particle Image Velocimetry (PIV) measurements, as well as simultaneous PIV and time-resolved base pressure measurements, are performed on these models in order to determine the near wake changes associated with base drag reduction. For the wedge model, the PIV measurements capture a downstream region of x/h = 0-1.5, whereas, for the flat plate model, the PIV measurements are performed at three different distances downstream, x/h = 0-7, 7-14 and 14-21. The PIV results are analyzed using Proper Orthogonal Decomposition (POD) in order to identify the changes in coherent structures associated with base drag reduction. It is observed from the POD results that, when there is a reduction in base drag, the vortex shedding in the near wake becomes more organized, its strength decreases, and the vortex convects faster. This result differs from those obtained in earlier studies, where base drag reduction is achieved by interrupting vortex shedding. In order to reconstruct near wake dynamics simultaneous PIV and time-resolved pressure measurements are used. Using Linear Stochastic Estimation (LSE)-POD technique, the cycle-to-cycle variation in vortex shedding is accurately captured. It is observed from the reconstruction that for the smooth test cases, the cycle-to-cycle variations in the vortex shedding are significantly higher, as compared to the rough test cases.
Book Synopsis Twenty-First Symposium on Naval Hydrodynamics by : National Research Council
Download or read book Twenty-First Symposium on Naval Hydrodynamics written by National Research Council and published by National Academies Press. This book was released on 1997-09-11 with total page 1100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation of Drag Reduction by Trailing Edge Tabs on a Square Based Bluff Body in Ground Effect by : Scott Sawyer
Download or read book Experimental Investigation of Drag Reduction by Trailing Edge Tabs on a Square Based Bluff Body in Ground Effect written by Scott Sawyer and published by . This book was released on 2015 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents an experimental investigation of drag reduction devices on a bluff body in ground effect. It has previously been shown that the addition of end-plate tabs to a rectangular based bluff body with an aspect ratio of 4 is effective in eliminating vortex shedding and reducing drag for low Reynolds number flows. In the present study a square based bluff body, both with and without tabs, will be tested under the same conditions, except this time operating within proximity to a ground plane in order to mimic the properties of bounded aerodynamics that would be present for a body in ground effect.
Book Synopsis Aerodynamic Drag Mechanisms of Bluff Bodies and Road Vehicles by : Gino Sovran
Download or read book Aerodynamic Drag Mechanisms of Bluff Bodies and Road Vehicles written by Gino Sovran and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: These Proceedings contain the papers and oral discussions presented at the Symposium on AERODYNAMIC DRAG MECHANISMS of Bluff Bodies and Road Vehides held at the General Motors Research Laboratories in Warren, Michigan, on September 27 and 28, 1976. This international, invitational Symposium was the twentieth in an annual series, each one having been in a different technical discipline. The Symposia provide a forum for areas of science and technology that are of timely interest to the Research Laboratories as weIl as the technical community at large, and in which personnel of the Laboratories are actively involved. The Symposia furnish an opportunity for the exchange of ideas and current knowledge between participating research specialists from educational, industrial arid governmental institutions and serve to stimulate future research activity. The present world-wide energy situation makes it highly desirable to reduce the force required to move road vehicles through the atmosphere. A significant amount of the total energy consumed for transportation is expended in overcoming the aerodynamic resistance to motion of these vehicles. Reductions in this aerodynamic drag can therefore have a large impact on ground transportation energy requirements. Although aerodynamic development work on road vehides has been performed for many years, it has not been widely reported or accompanied by much basic research.
Book Synopsis Aerodynamic Drag Reduction of Bluff Bodies by : Gargeshwari Suryanarayana
Download or read book Aerodynamic Drag Reduction of Bluff Bodies written by Gargeshwari Suryanarayana and published by LAP Lambert Academic Publishing. This book was released on 2010-06 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerodynamics of bluff bodies has gained the attention of aerodynamicists all over the world in recent times, primarily because of importance given to drag reduction by the automobile industry. Since pressure drag accounts for bulk of the drag of bluff bodies, any technique to manipulate and control the overall pressure field around such bodies to achieve base pressure rise causes reduction of drag. Interestingly, not many works are found on 3- dimensional bluff bodies such as spheres. Currently, interest in spherical airships is growing, triggered by the tourism industry. However, the high drag and management of highly unsteady wake of spheres are some of the aerodynamic issues that need to be addressed. This book offers the concept of passive natural ventilation as a potential solution. Natural ventilation occurs when the stagnation zone and the base are interconnected through an internal duct, which causes a jet flow through the center. Based on several years of experimental research, it is shown that natural ventilation of a sphere leads to substantial drag reduction and reduced wake unsteadiness at high Reynolds numbers.
Book Synopsis Experimental Investigation of Base Drag Reduction on a Two-dimensional Body Using Viscous Fore-body Drag by : Vibhav Durgesh
Download or read book Experimental Investigation of Base Drag Reduction on a Two-dimensional Body Using Viscous Fore-body Drag written by Vibhav Durgesh and published by . This book was released on 2004 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Study of Passive Drag Reduction in a Turbulent Boundary Layer by a Riblet Surface by : Seong-Ryong Park
Download or read book An Experimental Study of Passive Drag Reduction in a Turbulent Boundary Layer by a Riblet Surface written by Seong-Ryong Park and published by . This book was released on 1992 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigations of Base Drag Reduction Using Passive Jet Flow Control by : William B Bartow
Download or read book Experimental Investigations of Base Drag Reduction Using Passive Jet Flow Control written by William B Bartow and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This study is focused on the experimental investigation of an extended rear view mirror and the development of near-wake flow in an effort to reduce the overall base pressure drag of the model. The passive flow control technique was employed through a circumferential slot of the rearward facing edge of a bluff body to deliver a passive jet in the direction of the free stream. The passive jet employs the surrounding high energy free stream air through an intake slot in the front of the model in order to enhance the mixing layer of the immediate wake region in addition to energizing the wake area flow through entrainment. These effects subsequently caused a reduction of the effects of adverse pressure gradients that are associated with separation of the free stream shear layer over the over the passive jet model surface. The jet produced along the rear surface not only increased the turbulence of the mixing layer, but can also be directly tied to the coherent nature of the wake area flow. Using Two Dimensional Two Component (2D2C) in addition to Two Dimensional Three component (2D3C) Particle Image Velocimetry applied to our model in an open circuit wind tunnel, results show a substantial reduction in the overall wake area for which we attribute to the enhancements due to mixing effects of the passive jet interacting with the free stream shear layer. Flow entrainment from enhanced vorticity through the production coherent structures are believed to initiate the mixing layer earlier, in addition to increase the growth rate of the mixing layer while also attributing to the increase in the overall shear layer thickness as well. Particle Image Velocimetry (PIV) was carried out on an automobile mirror model with three configurations in order to investigate the effects of a baseline model including the absence of a passive jet mixing, a modified model including a small area circumferential jet and a heavily modified model including a large circumferential slot area jet. In combination with PIV, Partial Orthogonal Decomposition (POD) also referred to as the Karhunen Loeve expansion, was also applied in order to analyze the underlying large scale structures and dominant behaviors that would otherwise be hard to identify in the immediate wake flow structure. The mirror models used for testing was designed and produced to provide three specific testing configurations, baseline, Jet 1 and Jet 2. In order to proceed with the testing of the mirror models, the design and manufacturing of a reinforced force balance mounting apparatus was necessary in order to provide a more rigid and secure platform to measure aerodynamic loads of the mirror and future designs. The nature of the new design includes multiple support location in order to more equally distribute the loading in addition to bearings to assist in experiments that require a rotation of the model in order to increase the angle with respect to the free steam flow.
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 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Aerodynamics of Heavy Vehicles: Trucks, Buses, and Trains by : Rose McCallen
Download or read book The Aerodynamics of Heavy Vehicles: Trucks, Buses, and Trains written by Rose McCallen and published by Springer Science & Business Media. This book was released on 2004-09 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book includes the carefully edited contributions to the United Engineering Foundation Conference: The Aerodynamics of Heavy Vehicles: Trucks, Buses and Trains held in Monterey, California from December 2-6, 2002. This conference brought together 90 leading engineering researchers discussing the aerodynamic drag of heavy vehicles. The book topics include a comparison of computational fluid dynamics calculations using both steady and unsteady Reynolds-averaged Navier-Stokes, large-eddy simulation, and hybrid turbulence models and experimental data obtained from wind tunnel experiments. Advanced experimental techniques including three-dimensional particle image velocimetry are presented as well, along with their use in evaluating drag reduction devices.
Book Synopsis An experimental study of the reduction in drag on a rotating cylinder when held at moderately low pressures for extended periods of time (the soaking effect). by : A. R. Kuhlthau
Download or read book An experimental study of the reduction in drag on a rotating cylinder when held at moderately low pressures for extended periods of time (the soaking effect). written by A. R. Kuhlthau and published by . This book was released on 1960 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Highway Safety Literature written by and published by . This book was released on 1979 with total page 926 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Base Drag Reduction on a Bluff Body Using Zero and Non-zero Net Mass Flux Excitations by : Ty A. Walsh
Download or read book Base Drag Reduction on a Bluff Body Using Zero and Non-zero Net Mass Flux Excitations written by Ty A. Walsh and published by . This book was released on 2008 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: Involves setting up up a particle image velocimetry laboratory for Cal Poly, and investigating the effect of both zero and non-zero net mass flow injection at the trailing edge of a bluff body model with a 45-degree exit plane trajectory.
Book Synopsis Aerodynamic Drag Reduction for a Simple Bluff Body Using Base Bleed by :
Download or read book Aerodynamic Drag Reduction for a Simple Bluff Body Using Base Bleed written by and published by . This book was released on 2003 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bluff-body Drag Reduction as a Result of Base Flow Injection by : D. Arzoglou
Download or read book Bluff-body Drag Reduction as a Result of Base Flow Injection written by D. Arzoglou and published by . This book was released on 2003 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis IUTAM Symposium on One Hundred Years of Boundary Layer Research by : Hans-Joachim Heinemann
Download or read book IUTAM Symposium on One Hundred Years of Boundary Layer Research written by Hans-Joachim Heinemann and published by Springer Science & Business Media. This book was released on 2006-12-20 with total page 507 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book collects peer-reviewed lectures of the IUTAM Symposium on the 100th anniversary of Boundary Layer research. No other reference of this calibre, on this topic, is likely to be published for the next decade. Covers classification, definition and mathematics of boundary layers; instability of boundary layers and transition; boundary layers control; turbulent boundary layers; numerical treatment and boundary layer modelling; special effects in boundary layers.
