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Computational Sensing And Closed Loop Active Flow Control Of Airfoil At Post Stall Conditions
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Book Synopsis Computational Sensing and Closed-loop Active Flow Control of Airfoil at Post-stall Conditions by : Volkan Kamaci
Download or read book Computational Sensing and Closed-loop Active Flow Control of Airfoil at Post-stall Conditions written by Volkan Kamaci and published by . This book was released on 2005 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computational Sensing and Active Flow Control of Airfoil at Stall Conditions by : Ersin Gercek
Download or read book Computational Sensing and Active Flow Control of Airfoil at Stall Conditions written by Ersin Gercek and published by . This book was released on 2004 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computational Analysis of Circulation Control Airfoils by :
Download or read book Computational Analysis of Circulation Control Airfoils written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Current projections for future aircraft concepts call for stringent requirements on high-lift and low cruise-drag. The purpose of this study is to examine the use of circulation control, through trailing edge blowing, to meet both requirements. This study was conducted in two stages: (i) validation of computational fluid dynamic procedures on a general aviation circulation control airfoil and (ii) a study of an adaptive circulation control airfoil for controlling lift coefficients in the low-drag range. In an effort to validate computational fluid dynamics procedures for calculating flows around circulation control airfoils, the commercial flow solver FLUENT was utilized to study the flow around a general aviation circulation control airfoil. The results were compared to experimental and computational fluid dynamics results conducted at the NASA Langley Research Center. This effort was conducted in three stages: (i) a comparison of the results for free-air conditions to those from previously conducted experiments, (ii) a study of wind-tunnel wall effects, and (iii) a study of the stagnation-point behavior. In general, the trends in the results from the current work agreed well with those from experiments, some differences in magnitude were present between computations and experiments. For the cases examined, FLUENT computations showed no noticeable effect on the results due to the presence of wind-tunnel walls. The study also showed that the leading-edge stagnation point moves in a systematic manner with changes to the jet blowing coefficient and angle of attack, indicating that this location can be sensed for use in closed-loop control of such airfoil flows. The focus of the second part of the study was to examine the use of adaptive circulation control on a natural laminar flow airfoil for controlling the lift coefficient of the low-drag range. In this effort, adaptive circulation control was achieved through blowing over a small mechanical flap that can be deflec.
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 2018-12-13 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: Master the theory, applications and control mechanisms of flow control techniques.
Book Synopsis Flow Control of Airfoil at Post-stall Conditions by Multiple Frequency Applied SAADO Jets by : A. Şamil Demirsöz
Download or read book Flow Control of Airfoil at Post-stall Conditions by Multiple Frequency Applied SAADO Jets written by A. Şamil Demirsöz and published by . This book was released on 2006 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of SAI Intelligent Systems Conference (IntelliSys) 2016 by : Yaxin Bi
Download or read book Proceedings of SAI Intelligent Systems Conference (IntelliSys) 2016 written by Yaxin Bi and published by Springer. This book was released on 2017-08-22 with total page 1084 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings of the SAI Intelligent Systems Conference 2016 (IntelliSys 2016) offer a remarkable collection of papers on a wide range of topics in intelligent systems, and their applications to the real world. Authors hailing from 56 countries on 5 continents submitted 404 papers to the conference, attesting to the global importance of the conference’s themes. After being reviewed, 222 papers were accepted for presentation, and 168 were ultimately selected for these proceedings. Each has been reviewed on the basis of its originality, novelty and rigorousness. The papers not only present state-of-the-art methods and valuable experience from researchers in the related research areas; they also outline the field’s future development.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722129682 Total Pages :32 pages Book Rating :4.1/5 (296 download)
Book Synopsis Control of Unsteady Separated Flow Associated with the Dynamic Stall of Airfoils by : National Aeronautics and Space Administration (NASA)
Download or read book Control of Unsteady Separated Flow Associated with the Dynamic Stall of Airfoils written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The two principal objectives of this research were to achieve an improved understanding of the mechanisms involved in the onset and development of dynamic stall under compressible flow conditions, and to investigate the feasibility of employing adaptive airfoil geometry as an active flow control device in the dynamic stall engine. Presented here are the results of a quantitative (PDI) study of the compressibility effects on dynamic stall over the transiently pitching airfoil, as well as a discussion of a preliminary technique developed to measure the deformation produced by the adaptive geometry control device, and bench test results obtained using an airfoil equipped with the device. Wilder, Michael C. Unspecified Center NCC2-637...
Book Synopsis Numerical Investigation of Active Flow Control Applied to an Airfoil Leading Edge by : Bhanu Prakash Reddy Samala
Download or read book Numerical Investigation of Active Flow Control Applied to an Airfoil Leading Edge written by Bhanu Prakash Reddy Samala and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Objectives: The major objective of the Master Thesis proposal is to perform 2D computational study and compare the enhancement in the global aerodynamic coefficients, mainly lift and drag coefficients, for cases of with and without Active Flow Control (AFC). The focus is also on various cases of parameters of active flow control i.e, frequency of fluid ejection, jet velocity from actuator and location of slots for actuators for delaying the airfoil leading edge separation. Introduction: In the present context, the focused area is an airfoil of a regular commercial plane. The major concern while conducting experimental or numerical fluid dynamics study with the airfoils is to delay the separation of air (fluid) on both of the pressure sides on wing. The two main locations where the separation of fluid have an impact on global lift and drag coefficients include the leading edge boundary layer and the separation on the trailing edge flap.(Ciobaca & Wild, 2013). The techniques to delay the separation layer are of two major types which include Active Flow Control(AFC) and Passive Flow Control (PFC) (Jansen, 2012). The reason to choose AFC for this case is the reliability of the technique for all the future developments in various sectors like aerospace, automobile, wind energy etc (Nasa Website news 2013 [5][6]). Active Flow Control is becoming a viable tool for modifying flows for many practical applications. Active flow control can enable the design of simpler, smaller and more aerodynamically efficient structures that help reduce aircraft weight, drag, and fuel consumption. It typically refers to the use of time-dependent (often periodic) disturbances that are introduced into the flow field by the actuators. Also, AFC modifies the flow by adding energy (blowing) or by removing energy (suction). Methodology: As aforementioned, the proposed thesis focus is on computational study of the airfoil leading edge boundary layer with and without AFC. The variation of global lift and drag coefficients on varying the parameters of Active Flow Control like frequency, jet velocity and location of slots. The research conducted by (Burt Gunther et.al 2010) on AFC for airfoil flap will be used as guidance for conducting the similar test cases for Leading Edge AFC. The preliminary results from the computational model will be compared with the existing experimental results obtained at TU Braunschweig and DLR, Germany (Ciobaca & Wild, 2013) to check the accuracy and reliability of the numerical simulation results in order to further contribute to the existing state of the art results. To develop the computational model, the NACA2412 is chosen. The initial focus is on incompressible flow conditions by choosing the appropriate turbulence model and other numerical methods for solving Unsteady Reynolds Averaged Navier Stokes (URANS) Equations. Depending upon the accuracy of the results when compared with the experimental results, there will always be a flexibility to improvise the results using more computationally intensive numerical methods. The major software tools that will be used include a combination of ANSYS Fluent and OpenFOAM. References: 1. Ciobaca, V., & Wild, J. (2013). An Overview of Recent DLR Contributions on Active Flow-Separation Control Studies for High- Lift Configurations, (6), 1-12. 2. Generators, V., & Jansen, D. P. (2012). Passive Flow Separation Control on an Airfoil-Flap Model, (August). 3. Nagib, P. H. M., Kiedaisch, J. W., Wygnanski, P. I. J., Stalker, A. D., Wood, T., & Mcveigh, M. A. (n.d.). First-In- Flight Full-Scale Application of Active Flow Control : The XV-15 Tiltrotor Download Reduction.
Book Synopsis Closed-loop Active Flow Control by : M. Samimy
Download or read book Closed-loop Active Flow Control written by M. Samimy and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Control of a Post-stall Airfoil Using Pulsed Jets by : Kyle Donald Hipp
Download or read book Control of a Post-stall Airfoil Using Pulsed Jets written by Kyle Donald Hipp and published by . This book was released on 2016 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: The performance of active flow control on a NACA 643-618 laminar airfoil at post-stall angles of attack is evaluated using discrete, wall-normal pulsed jets. Actuation is implemented near the leading edge of the airfoil. For actuation periods equal to one convective period, and two convective periods at a chord Reynolds number of 64,000, the time-average lift coefficient increases monotonically as the actuation duty cycle is reduced, for a given blowing ratio. Flow reattachment is achieved following the termination of a short duration pulse, enclosing a separation bubble. The reattachment point propagates towards the trailing edge at a rate three times slower than the convective period of the flow. Extended jet off-times can cause full separation to reoccur should the reattachment point reach the trailing edge, however optimal jet off-times can cause suction pressure to extend over much of the airfoil chord. Higher duty cycle actuation results in a phase shift of the dynamics that appears to be commensurate with the duration of the jet. A disturbance initiated by the termination of the jet causes a delay in the redevelopment of the shear layer and the reattachment of the flow, prohibiting high lift values from being attained. Data collected at multiple post-stall angles of attack show that the rate at which the reattachment point propagates downstream increases with higher angles of attack. At twice the Reynolds number, the same dynamics appear to persist however a weak suction pressure recovery over the extent of the separation bubble reduces the distinction in time-averaged lift between short and long jet pulse durations.
Book Synopsis Wind Turbines by : Abdel Ghani Aissaoui
Download or read book Wind Turbines written by Abdel Ghani Aissaoui and published by BoD – Books on Demand. This book was released on 2016-07-27 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Renewable energies constitute excellent solutions to both the increase of energy consumption and environment problems. Among these energies, wind energy is very interesting. Wind energy is the subject of advanced research. In the development of wind turbine, the design of its different structures is very important. It will ensure: the robustness of the system, the energy efficiency, the optimal cost and the high reliability. The use of advanced control technology and new technology products allows bringing the wind energy conversion system in its optimal operating mode. Different strategies of control can be applied on generators, systems relating to blades, etc. in order to extract maximal power from the wind. The goal of this book is to present recent works on design, control and applications in wind energy conversion systems.
Book Synopsis The Computation of the Post-stall Behavior of a Circulation Controlled Airfoil by : Samuel W. Linton
Download or read book The Computation of the Post-stall Behavior of a Circulation Controlled Airfoil written by Samuel W. Linton and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Active Flow Control Applied to an Airfoil by : John F. Donovan
Download or read book Active Flow Control Applied to an Airfoil written by John F. Donovan and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Active control of the separation region on a two-dimensional airfoil by : Julie Anne Lovato
Download or read book Active control of the separation region on a two-dimensional airfoil written by Julie Anne Lovato and published by . This book was released on 1992 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This experimental analysis presents a comprehensive study of the separating boundary layer over a static airfoil under natural and actively controlled conditions. Near-surface hot-film and surface pressure measurements, as well as flow visualization are used to analyze the large-scale nature of the flow over a two-dimensional NACA-0015 airfoil and determine forcing effects. Results from the static study are then extended for an initial evaluation of unsteady airfoil control. Results show that the fundamental frequency associated with free shear layer instabilities for this case is an integral multiple of the frequency associated with wake structures. The static separating boundary layer response to active control confirms that it is a boundary layer transitioning to a free shear layer. Qualitative analyses show that significant reduction in overall static separation can be achieved under forcing conditions. Upper airfoil surface suction values are also significantly increased over the natural values. Applying tangential pulsed air control at static fundamental frequencies to a dynamic airfoil results in delay of the dynamic stall vortex formation and a delay of dynamic stall. These discoveries indicate that the developed control methodology may prove successful in increasing unsteady aircraft maneuverability. Subject terms: Static Airfoil Control; Separation Control; Unsteady Aerodynamics; Boundary Layer Control."--Report documentation page.
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 2007-08-29 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 Introduction to Aircraft Flight Mechanics by : Thomas R. Yechout
Download or read book Introduction to Aircraft Flight Mechanics written by Thomas R. Yechout and published by AIAA. This book was released on 2003 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on a 15-year successful approach to teaching aircraft flight mechanics at the US Air Force Academy, this text explains the concepts and derivations of equations for aircraft flight mechanics. It covers aircraft performance, static stability, aircraft dynamics stability and feedback control.
Book Synopsis Nonlinear System Identification by : Oliver Nelles
Download or read book Nonlinear System Identification written by Oliver Nelles and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 785 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written from an engineering point of view, this book covers the most common and important approaches for the identification of nonlinear static and dynamic systems. The book also provides the reader with the necessary background on optimization techniques, making it fully self-contained. The new edition includes exercises.
