Flow Control Simulation With Synthetic And Pulsed Jet Actuator
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Flow Control Simulation With Synthetic And Pulsed Jet Actuator
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Author : Sol Keun Jee
language : en
Publisher:
Release Date : 2010
Flow Control Simulation With Synthetic And Pulsed Jet Actuator written by Sol Keun Jee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Two active flow control methods are investigated numerically to understand the mechanism by which they control aerodynamics in the presence of severe flow separation on an airfoil. In particular, synthetic jets are applied to separated flows generated by additional surface feature (the actuators) near the trailing edge to obtain Coanda-like effects, and an impulse jet is used to control a stalled flow over an airfoil. A moving-grid scheme is developed, verified and validated to support simulations of external flow over moving bodies. Turbulent flow is modeled using detached eddy simulation (DES) turbulence models in the CFD code CDP (34) developed by Lopez (54). Synthetic jet actuation enhances turbulent mixing in flow separation regions, reduces the size of the separation, deflects stream lines closer to the surface and changes pressure distributions on the surface, all of which lead to bi-directional changes in the aerodynamic lift and moment. The external flow responds to actuation within about one convective time, which is significantly faster than for conventional control surfaces. Simulation of pitching airfoils shows that high-frequency synthetic jet affects the flow independently of the baseline frequencies associated with vortex shedding and airfoil dynamics. These unique features of synthetic jets are studied on a dynamically maneuvering airfoil with a closed-loop control system, which represents the response of the airfoil in wind-tunnel experiments and examines the controller for a rapidly maneuvering free-flight airfoil. An impulse jet, which is applied upstream of a nominal flow separation point, generates vortices that convect downstream, interact with the separating shear layer, dismantle the layer and allow following vortices to propagate along the surface in the separation region. These following vortices delay the separation point reattaching the boundary layer, which returns slowly to its initial stall condition, as observed in wind-tunnel experiments. A simple model of the impulse jet actuator used herein is found to be sufficient to represent the global effects of the jet on the stalled flow because it correctly represents the momentum injected into the flow.
Iutam Symposium On Flow Control And Mems
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Author : Jonathan F. Morrison
language : en
Publisher: Springer Science & Business Media
Release Date : 2010-09-09
Iutam Symposium On Flow Control And Mems written by Jonathan F. Morrison and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-09-09 with Technology & Engineering categories.
The Symposium brought together many of the world’s experts in fluid mechanics, microfabrication and control theory to discover the synergy that can lead to real advances and perhaps find ways in which collaborative projects may proceed. The high profile meeting was attended by keynote speakers who are leaders in their fields. A key driver was the improvement in flow efficiency to reduce drag, and thereby emissions arising from transport. About 65 papers were presented.
Advances In Effective Flow Separation Control For Aircraft Drag Reduction
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Author : Ning Qin
language : en
Publisher: Springer Nature
Release Date : 2019-10-17
Advances In Effective Flow Separation Control For Aircraft Drag Reduction written by Ning Qin and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-10-17 with Technology & Engineering categories.
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.
Vortex Rings And Jets
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Author : Daniel T. H. New
language : en
Publisher: Springer
Release Date : 2015-03-26
Vortex Rings And Jets written by Daniel T. H. New and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-03-26 with Technology & Engineering categories.
In this book, recent developments in our understanding of fundamental vortex ring and jet dynamics will be discussed, with a view to shed light upon their near-field behaviour which underpins much of their far-field characteristics. The chapters provide up-to-date research findings by their respective experts and seek to link near-field flow physics of vortex ring and jet flows with end-applications in mind. Over the past decade, our knowledge on vortex ring and jet flows has grown by leaps and bounds, thanks to increasing use of high-fidelity, high-accuracy experimental techniques and numerical simulations. As such, we now have a much better appreciation and understanding on the initiation and near-field developments of vortex ring and jet flows under many varied initial and boundary conditions. Chapter 1 outlines the vortex ring pinch-off phenomenon and how it relates to the initial stages of jet formations and subsequent jet behaviour, while Chapter 2 takes a closer look at the behaviour resulting from vortex ring impingement upon solid boundaries and how the use of a porous surface alters the impingement process. Chapters 3 and 4 focus upon the formation of synthetic jets from vortex ring structures experimentally and numerically, the challenges in understanding the relationships between their generation parameters and how they can be utilized in flow separation control problems. Chapter 5 looks at the use of imposing selected nozzle trailing-edge modifications to effect changes upon the near-field dynamics associated with circular, noncircular and coaxial jets, with a view to control their mixing behaviour. And last but not least, Chapter 6 details the use of unique impinging jet configurations and how they may lend themselves towards greater understanding and operating efficacies in heat transfer problems. This book will be useful to postgraduate students and researchers alike who wish to get up to speed regarding the latest developments in vortex ring and jet flow behaviour and how their interesting flow dynamics may be put into good use in their intended applications.
Frontiers Of Computational Fluid Dynamics 2006
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Author : Mohamed M Hafez
language : en
Publisher: World Scientific
Release Date : 2005-12-07
Frontiers Of Computational Fluid Dynamics 2006 written by Mohamed M Hafez and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-12-07 with Science categories.
The series of volumes to which this book belongs honors contributors who have made a major impact in computational fluid dynamics. This fourth volume in the series is dedicated to David Caughey on the occasion of his 60th birthday. The first volume was published in 1994 and was dedicated to Prof Antony Jameson. The second, dedicated to Earl Murman, was published in 1998. The third volume was dedicated to Robert MacCormack in 2002.Written by leading researchers from academia, government laboratories, and industry, the contributions in this volume present descriptions of the latest developments in techniques for numerical analysis of fluid flow problems, as well as applications to important problems in industry.
Fluid Machinery And Fluid Mechanics
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Author : Jianzhong Xu
language : en
Publisher: Springer Science & Business Media
Release Date : 2010-07-05
Fluid Machinery And Fluid Mechanics written by Jianzhong Xu and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-07-05 with Technology & Engineering categories.
"Fluid Machinery and Fluid Mechanics: 4th International Symposium (4th ISFMFE)" is the proceedings of 4th International Symposium on Fluid Machinery and Fluid Engineering, held in Beijing November 24-27, 2008. It contains 69 highly informative technical papers presented at the Mei Lecture session and the technical sessions of the symposium. The Chinese Society of Engineering Thermophysics (CSET) organized the First, the Second and the Third International Symposium on Fluid Machinery and Fluid Engineering (1996, 2000 and 2004). The purpose of the 4th Symposium is to provide a common forum for exchange of scientific and technical information worldwide on fluid machinery and fluid engineering for scientists and engineers. The main subject of this symposium is "Fluid Machinery for Energy Conservation". The "Mei Lecture" reports on the most recent developments of fluid machinery in commemoration of the late professor Mei Zuyan. The book is intended for researchers and engineers in fluid machinery and fluid engineering. Jianzhong Xu is a professor at the Chinese Society of Engineering Thermophysics, Chinese Academy of Sciences, Beijing.
Flow Control Techniques And Applications
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Author : Jinjun Wang
language : en
Publisher: Cambridge University Press
Release Date : 2019
Flow Control Techniques And Applications written by Jinjun Wang and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Science categories.
Master the theory, applications and control mechanisms of flow control techniques.
Proceedings Of The Asme Fluids Engineering Division Summer Conference 2006 Forums
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Author : American Society of Mechanical Engineers. Fluids Engineering Division
language : en
Publisher:
Release Date : 2006
Proceedings Of The Asme Fluids Engineering Division Summer Conference 2006 Forums written by American Society of Mechanical Engineers. Fluids Engineering Division and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Fluid dynamics categories.
Recent Developments In Aerodynamics
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Author : Arash Shams Taleghani
language : en
Publisher: Frontiers Media SA
Release Date : 2025-01-24
Recent Developments In Aerodynamics written by Arash Shams Taleghani and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2025-01-24 with Technology & Engineering categories.
Aerodynamics is a branch of fluid mechanics that deals with the motion of air and other gaseous fluids and the forces acting on bodies in motion relative to such fluids. Aerodynamics are classified according to Mach number into incompressible subsonic, compressible subsonic, transonic, supersonic and hypersonic aerodynamics. Aerodynamics can be divided into different forms of internal or external aerodynamics. For example, the study of flow properties inside a gas turbine or rocket engine is an example of internal aerodynamics that is important in accurately estimating thrust force. Examples of external aerodynamics include the flow around the body of airplanes, helicopters, space capsules, cars, rockets and missiles, trains, ships, wind turbines, and even such structures as bridges and tall buildings, which often have to withstand strong winds. Since the first human flights until today, aerodynamics has been growing and developing rapidly. Aerodynamics is one of the applied sciences in engineering that pursues several goals such as estimating forces, moments on objects moving in the air, or estimating heat transfer from these objects. Aerodynamics investigates how gases interact with moving bodies. The main purpose of aerodynamics in most cases is to reduce drag forces and increase lift force, which can lead to less fuel consumption in vehicles and achieving the greatest speed. Of course, in some special cases, such as hypersonic aerodynamics, there is a greater interest in increasing drag to reduce the adverse effects of aerodynamic heating. Another goal of studying aerodynamics is to obtain the details of the flow around flying objects. For example, the correct operation of a control rudder or flap in a supersonic aircraft, or the recognition of the phenomenon of blackout during spacecraft reentry, which occurs under the influence of aerothermodynamic heating and plasma formed around the antenna, is of great importance.
28th Aiaa Fluid Dynamics Conference 4th Aiaa Shear Flow Control Conference
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Author :
language : en
Publisher:
Release Date : 1997
28th Aiaa Fluid Dynamics Conference 4th Aiaa Shear Flow Control Conference written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Fluid dynamics categories.