Experimental Investigations Of Base Drag Reduction Using Passive Jet Flow Control

Download Experimental Investigations Of Base Drag Reduction Using Passive Jet Flow Control full books in PDF, epub, and Kindle. Read online Experimental Investigations Of Base Drag Reduction Using Passive Jet Flow Control ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!

Experimental Investigations of Base Drag Reduction Using Passive Jet Flow Control

Author : William B Bartow
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (12 download)

DOWNLOAD NOW!

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.

Low Drag Automotive Mirror Using Passive Flow Jet Control

Author : Greg Woyczynski
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (12 download)

DOWNLOAD NOW!

Book Synopsis Low Drag Automotive Mirror Using Passive Flow Jet Control by : Greg Woyczynski

Download or read book Low Drag Automotive Mirror Using Passive Flow Jet Control written by Greg Woyczynski and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The work presented in this thesis includes a detailed study of passive jet flow control as applied to an automotive side-view mirror. Numerical analysis as well as experimental prototype tests are conducted on three models of mirrors: one baseline model and two others with variable jet strength. An open inlet draws a certain amount of flow, passes it through a converging duct, and exhausts the flow as a jet with an angle toward the center of the mirror. The jet forms a boat-tail effect that entrains high energy flow from the free stream to the base area, increasing the base pressure, and reducing the base drag. Throughout this thesis, drag reduction compared to the conventional automotive mirror is proven and detailed through computational fluid dynamics (CFD) simulation validated with wind tunnel experiments. The CFD algorithm employed is high order large eddy simulation (LES) and the code is produced by the CFD research group at the University of Miami. The jet 1 model has an inlet area that is 10% of the base area and is shown to have a drag decrease of 29.41% in CFD. In the jet 2 model, which has a four times larger inlet, we see a 40.91% drag decrease in CFD. This drag decrease is primarily due to wake reduction. The jet is observed as pulsing into the base area. The jet pulsation on the mid vertical and horizontal plane has a phase lag. The pulsing jet introduces coherent structures that enhance the entrainment of the main flow to the base area. An interesting phenomenon is observed that the jet generates negative entropy, which means the jet is energized by the free stream. The passive flow control is thus similar to an active jet flow control in this way. The mechanism of the negative entropy is not fully understood yet at this stage; more study are needed. The following are some task that warrant investigation: LES with refined grid to resolve the wake better in order to match the experimental PIV measurements, study the effect of different jet flow angle, study the inlet and outlet ratio effect on the mixing and entrainment, and scaling for the drag reduction with the geometric parameters.

Flow Control Techniques and Applications

Author : Jinjun Wang
Publisher : Cambridge University Press
ISBN 13 : 1107161568
Total Pages : 293 pages
Book Rating : 4.1/5 (71 download)

DOWNLOAD NOW!

Book Synopsis Flow Control Techniques and Applications by : Jinjun Wang

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.

Experimental Investigation of Base Drag Reduction on a Two-dimensional Body Using Viscous Fore-body Drag

Author : Vibhav Durgesh
Publisher :
ISBN 13 :
Total Pages : 154 pages
Book Rating : 4.:/5 (576 download)

DOWNLOAD NOW!

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:

An Experimental Study of Base Drag Reduction of a Bluff Body

Author : James E. Knight
Publisher :
ISBN 13 :
Total Pages : 160 pages
Book Rating : 4.:/5 (563 download)

DOWNLOAD NOW!

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.

Turbulent Drag Reduction by Surfactant Additives

Author : Feng-Chen Li
Publisher : John Wiley & Sons
ISBN 13 : 1118181115
Total Pages : 233 pages
Book Rating : 4.1/5 (181 download)

DOWNLOAD NOW!

Book Synopsis Turbulent Drag Reduction by Surfactant Additives by : Feng-Chen Li

Download or read book Turbulent Drag Reduction by Surfactant Additives written by Feng-Chen Li and published by John Wiley & Sons. This book was released on 2012-01-10 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent drag reduction by additives has long been a hot research topic. This phenomenon is inherently associated with multifold expertise. Solutions of drag-reducing additives are usually viscoelastic fluids having complicated rheological properties. Exploring the characteristics of drag-reduced turbulent flows calls for uniquely designed experimental and numerical simulation techniques and elaborate theoretical considerations. Pertinently understanding the turbulent drag reduction mechanism necessities mastering the fundamentals of turbulence and establishing a proper relationship between turbulence and the rheological properties induced by additives. Promoting the applications of the drag reduction phenomenon requires the knowledge from different fields such as chemical engineering, mechanical engineering, municipal engineering, and so on. This book gives a thorough elucidation of the turbulence characteristics and rheological behaviors, theories, special techniques and application issues for drag-reducing flows by surfactant additives based on the state-of-the-art of scientific research results through the latest experimental studies, numerical simulations and theoretical analyses. Covers turbulent drag reduction, heat transfer reduction, complex rheology and the real-world applications of drag reduction Introduces advanced testing techniques, such as PIV, LDA, and their applications in current experiments, illustrated with multiple diagrams and equations Real-world examples of the topic’s increasingly important industrial applications enable readers to implement cost- and energy-saving measures Explains the tools before presenting the research results, to give readers coverage of the subject from both theoretical and experimental viewpoints Consolidates interdisciplinary information on turbulent drag reduction by additives Turbulent Drag Reduction by Surfactant Additives is geared for researchers, graduate students, and engineers in the fields of Fluid Mechanics, Mechanical Engineering, Turbulence, Chemical Engineering, Municipal Engineering. Researchers and practitioners involved in the fields of Flow Control, Chemistry, Computational Fluid Dynamics, Experimental Fluid Dynamics, and Rheology will also find this book to be a much-needed reference on the topic.

Turbulence Control by Passive Means

Author : E. Coustols
Publisher : Springer Science & Business Media
ISBN 13 : 9400921594
Total Pages : 183 pages
Book Rating : 4.4/5 (9 download)

DOWNLOAD NOW!

Book Synopsis Turbulence Control by Passive Means by : E. Coustols

Download or read book Turbulence Control by Passive Means written by E. Coustols and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the 4th European Drag Reduction Meeting

Experimental Investigation of Passive and Active Friction Drag Reduction

Author : Wenfeng Li
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (17 download)

DOWNLOAD NOW!

Book Synopsis Experimental Investigation of Passive and Active Friction Drag Reduction by : Wenfeng Li

Download or read book Experimental Investigation of Passive and Active Friction Drag Reduction written by Wenfeng Li and published by . This book was released on 2017* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Handbook of Wind Energy Aerodynamics

Author : Bernhard Stoevesandt
Publisher : Springer Nature
ISBN 13 : 3030313077
Total Pages : 1495 pages
Book Rating : 4.0/5 (33 download)

DOWNLOAD NOW!

Book Synopsis Handbook of Wind Energy Aerodynamics by : Bernhard Stoevesandt

Download or read book Handbook of Wind Energy Aerodynamics written by Bernhard Stoevesandt and published by Springer Nature. This book was released on 2022-08-04 with total page 1495 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook provides both a comprehensive overview and deep insights on the state-of-the-art methods used in wind turbine aerodynamics, as well as their advantages and limits. The focus of this work is specifically on wind turbines, where the aerodynamics are different from that of other fields due to the turbulent wind fields they face and the resultant differences in structural requirements. It gives a complete picture of research in the field, taking into account the different approaches which are applied. This book would be useful to professionals, academics, researchers and students working in the field.

Active and Passive Separation Control for Drag Reduction of a Maneuvering Hull Form

Author : James Crandall Schulmeister
Publisher :
ISBN 13 :
Total Pages : 212 pages
Book Rating : 4.:/5 (986 download)

DOWNLOAD NOW!

Book Synopsis Active and Passive Separation Control for Drag Reduction of a Maneuvering Hull Form by : James Crandall Schulmeister

Download or read book Active and Passive Separation Control for Drag Reduction of a Maneuvering Hull Form written by James Crandall Schulmeister and published by . This book was released on 2017 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Boundary layer separation is a source of large fluid dynamic forces on many engineered vehicles and structures, limiting the speed and efficiency at which we transport people and goods. The maneuvering of ocean and air vehicles in particular is limited by resistance due to cross-flow separation. Hull forms with lower hydrodynamic resistance in maneuvers are able to follow trajectories with tighter turns and at higher speeds. Despite the progress that has been made in the control of two dimensional flow separation, little has been done to apply flow control to complex three-dimensional separation from maneuvering hull forms. This thesis studies and develops mechanisms for mitigating three-dimensional cross-flow separation to reduce the drag of hull forms in maneuvers. A new strategy is proposed for designing flow control mechanisms for the three dimensional flow past maneuvering hull forms based on the unsteady cross-flow analogy. The unsteady cross-flow analogy relates the steady flow past a three-dimensional body to an analogous unsteady two-dimensional flow past a cylinder that changes size and shape in time. This provides a framework for adapting two-dimensional drag reduction techniques to the three-dimensional flow. In addition, the unsteady cross-flow analogy is computationally inexpensive and so is suitable for iterative use in preliminary design. The new strategy is considered by first implementing the unsteady cross-flow analogy in numerical simulations. Next, passive and active flow control mechanisms are studied experimentally for drag reduction of a circular cylinder and then adapted through the analogy for drag reduction of a slender body at an angle of attack. Passive control is exerted through modifications to the shape of the body and active control is exerted with rotating control cylinders. Both passive and active methods are experimentally demonstrated to reduce the drag. The experimental results also confirm key predictions of the unsteady cross-flow analogy, demonstrating that it is a promising tool for developing three-dimensional separation control techniques.

Mitigation Of Hydrodynamic Resistance: Methods To Reduce Hydrodynamic Drag

Author : Marc Perlin
Publisher : World Scientific
ISBN 13 : 9814612278
Total Pages : 165 pages
Book Rating : 4.8/5 (146 download)

DOWNLOAD NOW!

Book Synopsis Mitigation Of Hydrodynamic Resistance: Methods To Reduce Hydrodynamic Drag by : Marc Perlin

Download or read book Mitigation Of Hydrodynamic Resistance: Methods To Reduce Hydrodynamic Drag written by Marc Perlin and published by World Scientific. This book was released on 2014-11-18 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text presents the state of the art in friction drag/resistance reduction technologies for BODIES and crafts operating in liquids at and beneath the free surface. It is useful for professionals with backgrounds in advanced fluid dynamics as well as by academics teaching introductory graduate courses in this area. Active control of resistance will include a discussion of friction reduction, for example through the injection of gas that can form air layers and polymers that initially reside adjacent to the hull, including the use of partial and super cavities. The book discusses passive resistance control achieved through changes in the overall hull shape and appendages, including the application of lifting bodies, bulbous bows, and stern flaps. It also addresses passive reduction of skin friction through the application of hull coatings and other elements of hull husbandry.

Drag Reduction in Fluid Flows

Author : Robert H. J. Sellin
Publisher :
ISBN 13 :
Total Pages : 360 pages
Book Rating : 4.:/5 (31 download)

DOWNLOAD NOW!

Book Synopsis Drag Reduction in Fluid Flows by : Robert H. J. Sellin

Download or read book Drag Reduction in Fluid Flows written by Robert H. J. Sellin and published by . This book was released on 1989 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Scientific and Technical Aerospace Reports

Author :
Publisher :
ISBN 13 :
Total Pages : 704 pages
Book Rating : 4.:/5 (31 download)

DOWNLOAD NOW!

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:

Drag Reduction of a Generic Car Model by Active Boundary Layer Control

Author : Mohammad Abbaspour
Publisher :
ISBN 13 : 9783659278204
Total Pages : 0 pages
Book Rating : 4.2/5 (782 download)

DOWNLOAD NOW!

Book Synopsis Drag Reduction of a Generic Car Model by Active Boundary Layer Control by : Mohammad Abbaspour

Download or read book Drag Reduction of a Generic Car Model by Active Boundary Layer Control written by Mohammad Abbaspour and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

An Experimental Study of Passive Drag Reduction in a Turbulent Boundary Layer by a Riblet Surface

Author : Seong-Ryong Park
Publisher :
ISBN 13 :
Total Pages : 410 pages
Book Rating : 4.:/5 (288 download)

DOWNLOAD NOW!

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:

Numerical Drag Reduction Studies on Generic Truck Models Using Passive and Active Flow Control

Author : Miles E. Bellman
Publisher :
ISBN 13 :
Total Pages : 157 pages
Book Rating : 4.:/5 (763 download)

DOWNLOAD NOW!

Book Synopsis Numerical Drag Reduction Studies on Generic Truck Models Using Passive and Active Flow Control by : Miles E. Bellman

Download or read book Numerical Drag Reduction Studies on Generic Truck Models Using Passive and Active Flow Control written by Miles E. Bellman and published by . This book was released on 2009 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt:

An Experimental Investigation of Sting-support Effects on Drag and a Comparison with Jet Effects at Transonic Speeds

Author : Charles L. Shuford
Publisher :
ISBN 13 :
Total Pages : 178 pages
Book Rating : 4.3/5 (243 download)

DOWNLOAD NOW!

Book Synopsis An Experimental Investigation of Sting-support Effects on Drag and a Comparison with Jet Effects at Transonic Speeds by : Charles L. Shuford

Download or read book An Experimental Investigation of Sting-support Effects on Drag and a Comparison with Jet Effects at Transonic Speeds written by Charles L. Shuford and published by . This book was released on 1958 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: