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Author : X. Chen
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (138 download)
Download or read book Study of Arc-discharge Plasma Actuators for the Control of Shock-wave Boundary-layer Interaction written by X. Chen and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Nathan Joseph Webb
Publisher :
ISBN 13 :
Total Pages : 111 pages
Book Rating : 4.:/5 (858 download)
Download or read book Control of a Shock Wave-boundary Layer Interaction Using Localized Arc Filament Plasma Actuators written by Nathan Joseph Webb and published by . This book was released on 2013 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: The potentially severe consequences associated with SWBLIs require flow control to ensure proper operation. Traditionally, boundary layer bleed has been used to control the interaction. Although this method is effective, it has inherent efficiency penalties. Localized Arc Filament Plasma Actuators (LAFPAs) are designed to generate perturbations for flow control. Natural flow instabilities act to amplify certain perturbations, allowing the LAFPAs to control the flow with minimal power input. LAFPAs also have the flexibility to maintain control over a variety of operating conditions.
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 : Nathan J. Webb
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (391 download)
Download or read book Control of the Interaction Between an Oblique Shock Wave and a Supersonic Turbulent Boundary Layer by Localized Arc Filament Plasma Actuators written by Nathan J. Webb and published by . This book was released on 2009 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The ability of localized arc filament plasma actuators to eliminate or reduce the extent of boundary layer separation in the interaction between an oblique shock wave and a turbulent boundary layer is examined. This is an important phenomenon occurring in many applications including supersonic aircraft engine inlets. The effects of the actuators on the flow were studied for varying frequency, location, and mode of actuation of the actuators. The effectiveness of the forcing was determined by using schlieren imaging techniques, particle image velocimetry, and unsteady pressure measurements. The data collected shows that the actuators do have significant effects on the flow and can effectively remove the separation caused by the shock wave/boundary layer interaction.
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 : Zambri Harun
Publisher : BoD – Books on Demand
ISBN 13 : 183769835X
Total Pages : 146 pages
Book Rating : 4.8/5 (376 download)
Download or read book Boundary Layer Flows - Advances in Experimentation, Modelling and Simulation written by Zambri Harun and published by BoD – Books on Demand. This book was released on 2024-07-24 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluid mechanics is a branch of physics with important applications in daily life. The calculation of flow drag on automobiles and high-speed trains benefits from theories in fluid mechanics. Moreover, many mechanical-based devices such as fluid pumps contribute to efficiency, and thus, to the modernization of society. This book highlights the experimental and theoretical aspects of wall-bounded flows to provide important information about related theories and applications. Boundary layer flow experimentation, modelling, and simulation must be considered together to obtain accurate calculations of parameters such as velocity profiles, pressure distribution, and turbulence level. This book is organized into three sections on the structure of the boundary layer, drag reduction initiatives using active control, and the verification and applications of flow mechanics. Chapters discuss the boundary layer type of different pressure gradients, Reynolds number, and speeds from 5 m/s to Mach 3. They also present the results of research on the active control technique for drag reduction initiatives to achieve efficient turbulence in high-speed applications, flow meter devices, and turbulence-generated noise mitigation initiatives.
Author : Reynald Bur
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (595 download)
Download or read book Study of Passive Control in a Transonic Shock Wave/boundary Layer Interaction written by Reynald Bur and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Régis Sperotto de Quadros
Publisher :
ISBN 13 :
Total Pages : 208 pages
Book Rating : 4.:/5 (463 download)
Download or read book Numerical Optimization of Boundary-layer Control Using Dielectric Barrier Discharge Plasma Actuators written by Régis Sperotto de Quadros and published by . This book was released on 2009 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Benton Robb Greene
Publisher :
ISBN 13 :
Total Pages : 100 pages
Book Rating : 4.:/5 (885 download)
Download or read book Control of Mean Separation in a Compression Ramp Shock Boundary Layer Interaction Using Pulsed Plasma Jets written by Benton Robb Greene and published by . This book was released on 2014 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pulsed plasma jets (also called "SparkJets'") were investigated for use in controlling the mean separation location induced by shock wave-boundary layer interaction. These synthetic jet actuators are driven by electro-thermal heating from an electrical discharge in a small cavity, which forces the gas in the cavity to exit through a small hole as a high-speed jet. With this method of actuation, pulsed plasma jets can achieve pulsing frequencies on the order of kilohertz, which is on the order of the instability frequency of many lab-scale shock wave-boundary layer interactions (SWBLI). The interaction under investigation was generated by a 20° compression ramp in a Mach 3 flow. The undisturbed boundary layer is transitional with Re[subscript theta] of 5400. Surface oil streak visualization is used in a parametric study to determine the optimum pulsing frequency of the jet, the optimum distance of the jet from the compression corner, and the optimum injection angle of the jets. Three spanwise-oriented arrays of three plasma jets are tested, each with a different pitch and skew angle on the jet exit port. The three injection angles tested were 22° pitch and 45° skew, 20° pitch and 0° skew, and 45° pitch and 0° skew. Jet pulsing frequency is varied between 2 kHz and 4 kHz, corresponding to a Strouhal number based on separation length of 0.012 and 0.023. Particle image velocimetry is used to characterize the effect that the actuators have on the reattached boundary layer profile on the ramp surface. Results show that plasma jets pitched at 20° from the wall, and pulsed at a Strouhal number of 0.018, can reduce the size of an approximate measure of the separation region by up to 40% and increase the integrated momentum in the downstream reattached boundary layer, albeit with a concomitant increase in the shape factor.
Author : Pascual Marqués
Publisher : John Wiley & Sons
ISBN 13 : 1118928687
Total Pages : 799 pages
Book Rating : 4.1/5 (189 download)
Download or read book Advanced UAV Aerodynamics, Flight Stability and Control written by Pascual Marqués and published by John Wiley & Sons. This book was released on 2017-07-11 with total page 799 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensively covers emerging aerospace technologies Advanced UAV aerodynamics, flight stability and control: Novel concepts, theory and applications presents emerging aerospace technologies in the rapidly growing field of unmanned aircraft engineering. Leading scientists, researchers and inventors describe the findings and innovations accomplished in current research programs and industry applications throughout the world. Topics included cover a wide range of new aerodynamics concepts and their applications for real world fixed-wing (airplanes), rotary wing (helicopter) and quad-rotor aircraft. The book begins with two introductory chapters that address fundamental principles of aerodynamics and flight stability and form a knowledge base for the student of Aerospace Engineering. The book then covers aerodynamics of fixed wing, rotary wing and hybrid unmanned aircraft, before introducing aspects of aircraft flight stability and control. Key features: Sound technical level and inclusion of high-quality experimental and numerical data. Direct application of the aerodynamic technologies and flight stability and control principles described in the book in the development of real-world novel unmanned aircraft concepts. Written by world-class academics, engineers, researchers and inventors from prestigious institutions and industry. The book provides up-to-date information in the field of Aerospace Engineering for university students and lecturers, aerodynamics researchers, aerospace engineers, aircraft designers and manufacturers.
Author : Nihar H. Chhatiawala
Publisher :
ISBN 13 :
Total Pages : 80 pages
Book Rating : 4.:/5 (114 download)
Download or read book Case Study written by Nihar H. Chhatiawala and published by . This book was released on 2018 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Boundary Labs, LLC is an early-stage company composed of three students at Case Western Reserve University which aimed to evaluate the feasibility of commercialization of a novel dielectric barrier discharge (DBD) plasma actuator as an active flow control (AFC) method in wind turbines. The hypothesized benefits of DBD plasma actuators for AFC include improved energy capture from wind, low cost, and ease of implementation. This thesis is a two-part case study. The first part emulates a Small Business Innovation Research (SBIR) Phase I Proposal for the technology and includes discussions arguing that a strong commercial potential for the proposed technology exists in the United States and that technical development is feasible. The second part includes miscellaneous sections outside the scope of an SBIR proposal, leading to a discussion of the Boundary Labs team decision to discontinue development of this technology.
Author : Julius Georg Lautner
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (31 download)
Download or read book System des schweizerischen Kriegswirtschaftsrechts written by Julius Georg Lautner and published by . This book was released on 1942 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Hansjoachim Bluhm
Publisher : Springer Science & Business Media
ISBN 13 : 3540346627
Total Pages : 335 pages
Book Rating : 4.5/5 (43 download)
Download or read book Pulsed Power Systems written by Hansjoachim Bluhm and published by Springer Science & Business Media. This book was released on 2006-07-01 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pulsed-Power Systems describes the physical and technical foundations for the production and application of high-voltage pulses of very high-power and high-energy character. In the initial chapters, it addresses materials, components and the most common diagnostics. In the second part, three categories of applications with scientific and industrial relevance are detailed: production of strong pulsed electric and magnetic fields, intense radiation sources and pulsed electric (plasma) discharges.
Author : Richard David Whalley
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (768 download)
Download or read book Turbulent Boundary-layer Control with DBD Plasma Actuators Using Spanwise Travelling-wave Technique written by Richard David Whalley and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent boundary-layer control has been investigated experimentally using a low-speed wind tunnel at the University of Nottingham, with an overall aim of achieving skin-friction drag reduction. The important part of this investigation is to understand the mechanism of drag reduction and the associated changes in the structure of the turbulent boundary layer. It was demonstrated with Direct Numerical Simulations (DNSs) nearly a decade ago that by applying a spanwise travelling wave in the near-wall region of a turbulent wall flow can lead to a skin-friction drag reduction on the order of 30%. To date, spanwise travelling waves are predominantly created by a Lorentz force, limiting the study of this technique to water flows and numerical investigations. As an aeronautical application of this innovative flow control technique, an investigation into the use of Dielectric-Barrier-Discharge (DBD) plasma actuators to generate spanwise travelling waves in air has been conducted. DBD plasma actuators have received enormous interest over the past ten years within the flow control community due to their unique properties. DBD plasma actuators are completely electrical and ionize the nearby air to couple momentum to the surrounding flow. Hence, DBD plasma actuators require no moving parts, which makes their design simple and without the need for complicated ducting, holes or cavities. They are fast acting, of low power, low in weight, cheap to manufacture and can be fitted to existing airframes. As the body force that the DBD plasma actuator creates is at the wall, DBD plasma actuators are an ideal candidate for wall-based flow control techniques such as the spanwise travelling wave-technique. In this study, DBD plasma actuators have been found to have the ability to greatly modify the near-wall region of the turbulent boundary layer with a potential to reduce skin-friction drag. The near-wall structures modified by the spanwise travelling waves were studied using the PIV technique, while the associated turbulence statistics were carefully documented using hot-wire anemometry. On initiation of DBD plasma in the turbulent boundary layer, streamwise vortices were generated. Spreading of low-speed fluid by the streamwise vortices that were travelling in the spanwise direction was observed, which seems to have greatly attenuated the turbulence production process. This is very much in line with the finding of DNS studies, where wide low-speed ribbons replaced the low-speed streaks.
Author : Ning Qin
Publisher : Springer Nature
ISBN 13 : 3030296881
Total Pages : 341 pages
Book Rating : 4.0/5 (32 download)
Download or read book Advances in Effective Flow Separation Control for Aircraft Drag Reduction written by Ning Qin and published by Springer Nature. This book was released on 2019-10-17 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the results of a European-Chinese collaborative research project, Manipulation of Reynolds Stress for Separation Control and Drag Reduction (MARS), including an analysis and discussion of the effects of a number of active flow control devices on the discrete dynamic components of the turbulent shear layers and Reynolds stress. From an application point of view, it provides a positive and necessary step to control individual structures that are larger in scale and lower in frequency compared to the richness of the temporal and spatial scales in turbulent separated flows.
Author :
Publisher :
ISBN 13 :
Total Pages : 160 pages
Book Rating : 4.:/5 (69 download)
Download or read book Liste complète de messieurs les députés aux Etats Généraux, de leurs adjoints & suppléants avec différentes observations & les déliberations du Haut Clergé & de la noblesse de Bretagne ... 1789 written by and published by . This book was released on 1789 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Joseph J. S. Shang
Publisher : Cambridge University Press
ISBN 13 : 110841897X
Total Pages : 403 pages
Book Rating : 4.1/5 (84 download)
Download or read book Plasma Dynamics for Aerospace Engineering written by Joseph J. S. Shang and published by Cambridge University Press. This book was released on 2018-06-21 with total page 403 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a comprehensive review and usable problem-solving techniques for aerospace engineering plasma applications.
