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Wind Tunnel Verification Of Drag Reduction By Microelectromechanical Systems Mems Based Flow Control
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Book Synopsis Wind Tunnel Verification of Drag Reduction by Microelectromechanical Systems (MEMS)-based Flow Control by : Laurence Keefe
Download or read book Wind Tunnel Verification of Drag Reduction by Microelectromechanical Systems (MEMS)-based Flow Control written by Laurence Keefe and published by . This book was released on 1999 with total page 100 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.
Download or read book MEMS written by Mohamed Gad-el-Hak and published by CRC Press. This book was released on 2005-11-29 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: As our knowledge of microelectromechanical systems (MEMS) continues to grow, so does The MEMS Handbook. The field has changed so much that this Second Edition is now available in three volumes. Individually, each volume provides focused, authoritative treatment of specific areas of interest. Together, they comprise the most comprehensive collection
Book Synopsis 22nd AIAA Aerodynamic Measurement Technology and Ground Testing Conference: 02-2700 - 02-2926 by :
Download or read book 22nd AIAA Aerodynamic Measurement Technology and Ground Testing Conference: 02-2700 - 02-2926 written by and published by . This book was released on 2002 with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Impact of Scale Model Wind Tunnel Testing on Antenna Drag Reduction by : Ronald S. Adrezin
Download or read book The Impact of Scale Model Wind Tunnel Testing on Antenna Drag Reduction written by Ronald S. Adrezin and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aerodynamic Drag Reduction Technologies by : Peter Thiede
Download or read book Aerodynamic Drag Reduction Technologies written by Peter Thiede and published by Springer Science & Business Media. This book was released on 2001-05-22 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the proceedings of the CEAS/DragNet European Drag Reduction Conference 2000. The conference addressed the recent advances in all areas of drag reduction research, development, validation and demonstration including laminar flow technology, adaptive wing concepts, turbulent and induced drag reduction, separation control and supersonic flow aspects. This volume is of particular interest to engineers, scientists and students working in the aeronautics industry, research establishments or academia.
Book Synopsis Oscillations, Waves and Interactions by : Thomas Kurz
Download or read book Oscillations, Waves and Interactions written by Thomas Kurz and published by Universitätsverlag Göttingen. This book was released on 2007 with total page 485 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 01-3003 - 01-3101 written by and published by . This book was released on 2001 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flow Control by : Mohamed Gad-el-Hak
Download or read book Flow Control written by Mohamed Gad-el-Hak and published by Cambridge University Press. This book was released on 2000-08-15 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: A thorough treatment of the basics of flow control and flow control practices.
Download or read book The Aeronautical Journal written by and published by . This book was released on 2000 with total page 742 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microelectromechanical Systems written by and published by . This book was released on 1996 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flow Control by : Mohamed Gad-el-Hak
Download or read book Flow Control written by Mohamed Gad-el-Hak and published by Springer Science & Business Media. This book was released on 2003-07-01 with total page 533 pages. Available in PDF, EPUB and Kindle. Book excerpt: No be certain it can is not based mathematics. knowledge if upon da Vinci, (Leonardo 1452 1519) the humankind. Thinking is one greatest of Joys of Galilei, (Galileo 1564 1642) Now I think is to be the root all hydrodynamics and is at of physical science, second the to none in its mathematics. present beauty of Thomson (William (Lord Kelvin), 1824 1907) The book contains the lecture notes of of the nine instructors at present eight the short Flow Control: Fundamentals and which held course was Practices, in the week 24 28 June and Carg6se, Corsica, France, during 1996, repeated at the of Notre 9 13 1996. University Dame, Indiana, September Following the week in the course a on same was held. Corsica, 5 day workshop topic Selected from the scheduled to 1998 workshop are papers appear early special volume of the International Journal Heat Thermo of Experimental Transfer, and Fluid All Mechanics. three events were Jean Paul dynamics, organized by Bonnet of Universit6 de Andrew Pollard of Univer Poitiers, France, Queen's at and Mohamed Gad el Hak of the of sity Kingston, Canada, University Notre U.S.A.
Book Synopsis On Subscale Flight Testing by : Alejandro Sobron
Download or read book On Subscale Flight Testing written by Alejandro Sobron and published by Linköping University Electronic Press. This book was released on 2018-11-05 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: Downscaled physical models, also referred to as subscale models, have played an essential role in the investigation of the complex physics of flight until the recent disruption of numerical simulation. Despite the fact that improvements in computational methods are slowly pushing experimental techniques towards a secondary role as verification or calibration tools, real-world testing of physical prototypes still provides an unmatched confidence. Physical models are very effective at revealing issues that are sometimes not correctly identified in the virtual domain, and hence can be a valuable complement to other design tools. But traditional wind-tunnel testing cannot always meet all of the requirements of modern aeronautical research and development. It is nowadays too expensive to use these scarce facilities to explore different design iterations during the initial stages of aircraft development, or to experiment with new and immature technologies. Testing of free-flight subscale models, referred to as Subscale Flight Testing (SFT), could offer an affordable and low-risk alternative for complementing conventional techniques with both qualitative and quantitative information. The miniaturisation of mechatronic systems, the advances in rapid-prototyping techniques and power storage, as well as new manufacturing methods, currently enable the development of sophisticated test objects at scales that were impractical some decades ago. Moreover, the recent boom in the commercial drone industry has driven a quick development of specialised electronics and sensors, which offer nowadays surprising capabilities at competitive prices. These recent technological disruptions have significantly altered the cost-benefit function of SFT and it is necessary to re-evaluate its potential in the contemporary aircraft development context. This thesis aims to increase the comprehension and knowledge of the SFT method in order to define a practical framework for its use in aircraft design; focusing on low-cost, short-time solutions that don’t require more than a small organization and few resources. This objective is approached from a theoretical point of view by means of an analysis of the physical and practical limitations of the scaling laws; and from an empirical point of view by means of field experiments aimed at identifying practical needs for equipment, methods, and tools. A low-cost data acquisition system is developed and tested; a novel method for semi-automated flight testing in small airspaces is proposed; a set of tools for analysis and visualisation of flight data is presented; and it is also demonstrated that it is possible to explore and demonstrate new technology using SFT with a very limited amount of economic and human resources. All these, together with a theoretical review and contextualisation, contribute to increasing the comprehension and knowledge of the SFT method in general, and its potential applications in aircraft conceptual design in particular.
Book Synopsis Boundary Layer and Flow Control by : Gustav Victor Lachmann
Download or read book Boundary Layer and Flow Control written by Gustav Victor Lachmann and published by Pergamon. This book was released on 1961 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Active Flow Control by : Rudibert King
Download or read book Active Flow Control written by Rudibert King and published by Springer Science & Business Media. This book was released on 2007-05-31 with total page 441 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains contributions presented at the Active Flow Control 2006 conference, held September 2006, at the Technische Universität Berlin, Germany. It contains a well balanced combination of theoretical and experimental state-of-the-art results of Active Flow Control. Coverage combines new developments in actuator technology, sensing, robust and optimal open- and closed-loop control and model reduction for control.
Book Synopsis Fox and McDonald's Introduction to Fluid Mechanics by : Robert W. Fox
Download or read book Fox and McDonald's Introduction to Fluid Mechanics written by Robert W. Fox and published by John Wiley & Sons. This book was released on 2020-06-30 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt: Through ten editions, Fox and McDonald's Introduction to Fluid Mechanics has helped students understand the physical concepts, basic principles, and analysis methods of fluid mechanics. This market-leading textbook provides a balanced, systematic approach to mastering critical concepts with the proven Fox-McDonald solution methodology. In-depth yet accessible chapters present governing equations, clearly state assumptions, and relate mathematical results to corresponding physical behavior. Emphasis is placed on the use of control volumes to support a practical, theoretically-inclusive problem-solving approach to the subject. Each comprehensive chapter includes numerous, easy-to-follow examples that illustrate good solution technique and explain challenging points. A broad range of carefully selected topics describe how to apply the governing equations to various problems, and explain physical concepts to enable students to model real-world fluid flow situations. Topics include flow measurement, dimensional analysis and similitude, flow in pipes, ducts, and open channels, fluid machinery, and more. To enhance student learning, the book incorporates numerous pedagogical features including chapter summaries and learning objectives, end-of-chapter problems, useful equations, and design and open-ended problems that encourage students to apply fluid mechanics principles to the design of devices and systems.
