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Tip Clearance Control Using Plasma Actuators
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Book Synopsis Tip Clearance Control Using Plasma Actuators by :
Download or read book Tip Clearance Control Using Plasma Actuators written by and published by . This book was released on 2007 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents experimental results from a series of experiments using active flow control to improve the performance and efficiency of turbine tip clearance flows. The flow control was based on plasma actuators. Two experimental facilities were used as part of this research project. The first was a low-speed, large-scale turbine cascade using Pak-B turbine blades. The second was a smaller scale, high-speed cascade with low aspect ratio. The active flow control was design to act as a plasma squealer". Specifically, the plasma force was oriented perpendicular to the camber line in order to resist the leakage flow through the tip gap. Both steady and unsteady forcing was used as a method for manipulating natural jet-like instabilities that existed as the leakage flow separated in the tip gap. The results have indicated that the unsteady plasma forcing was as effective as the passive squealer geometry in reducing the losses that occurred in the wake of the blade tip.
Book Synopsis Wind Tunnels and Experimental Fluid Dynamics Research by : Jorge Colman Lerner
Download or read book Wind Tunnels and Experimental Fluid Dynamics Research written by Jorge Colman Lerner and published by BoD – Books on Demand. This book was released on 2011-07-27 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book "Wind Tunnels and Experimental Fluid Dynamics Research" is comprised of 33 chapters divided in five sections. The first 12 chapters discuss wind tunnel facilities and experiments in incompressible flow, while the next seven chapters deal with building dynamics, flow control and fluid mechanics. Third section of the book is dedicated to chapters discussing aerodynamic field measurements and real full scale analysis (chapters 20-22). Chapters in the last two sections deal with turbulent structure analysis (chapters 23-25) and wind tunnels in compressible flow (chapters 26-33). Contributions from a large number of international experts make this publication a highly valuable resource in wind tunnels and fluid dynamics field of research.
Book Synopsis Separation Control Using Plasma Actuators: Experimental Studies of Plasma Actuator Performance by : DartKen Poon
Download or read book Separation Control Using Plasma Actuators: Experimental Studies of Plasma Actuator Performance written by DartKen Poon and published by . This book was released on 2011 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advances in Effective Flow Separation Control for Aircraft Drag Reduction by : Ning Qin
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.
Book Synopsis Axial Turbine Aerodynamics for Aero-engines by : Zhengping Zou
Download or read book Axial Turbine Aerodynamics for Aero-engines written by Zhengping Zou and published by Springer. This book was released on 2018-01-11 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a monograph on aerodynamics of aero-engine gas turbines focusing on the new progresses on flow mechanism and design methods in the recent 20 years. Starting with basic principles in aerodynamics and thermodynamics, this book systematically expounds the recent research on mechanisms of flows in axial gas turbines, including high pressure and low pressure turbines, inter-turbine ducts and turbine rear frame ducts, and introduces the classical and innovative numerical evaluation methods in different dimensions. This book also summarizes the latest research achievements in the field of gas turbine aerodynamic design and flow control, and the multidisciplinary conjugate problems involved with gas turbines. This book should be helpful for scientific and technical staffs, college teachers, graduate students, and senior college students, who are involved in research and design of gas turbines.
Book Synopsis Separation Control Using Plasma Actuators in a High Pressure Bend by : Michael J. Arthur
Download or read book Separation Control Using Plasma Actuators in a High Pressure Bend written by Michael J. Arthur and published by . This book was released on 2014 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Plasma Actuators for Separation Control of Low Pressure Turbine Blades by : Junhui Huang
Download or read book Plasma Actuators for Separation Control of Low Pressure Turbine Blades written by Junhui Huang and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Active Control of Tip Leakage Vortex Using DBD Plasma Actuators by : Christian Andres Anzalotta
Download or read book Active Control of Tip Leakage Vortex Using DBD Plasma Actuators written by Christian Andres Anzalotta and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In a turbomachine rotor, the gap between the rotor tip and the stationary casing creates tip-leakage vortices. These vortices act like a blockage to the incoming passage flow and effectively reduce the pressure ratio across the rotor stage, cause unsteadiness and vibration of the rotor tip, and lead to aerothermal losses due to complex secondary flows. Hence, mitigating the strength of these vortices is important for increasing the efficiency of a turbomachine. In this work, a simple actuation strategy was investigated with steady actuation of dielectric-barrier-discharge (DBD) plasma actuators. Investigation primarily involves the straight actuation which was operated in a steady as well as a minor comparison to a segmented actuator scheme to show the benefit of the straight actuation. The tip-leakage vortices were formed in the tip-gap of a single NACA-65 airfoil of chord 10 cm mounted in a suction-type wind tunnel with static tip-gap height between the airfoil and the floor. In the tip gap of the test section of the airfoil, DBD actuators were placed along the chord of the airfoil in the tip-gap. The major objective of this research was to investigate the effectiveness of steady forcing on the tip-leakage vortex. Stereo-particle image-velocimetry (SPIV) was used to measure the flow field around the tip gap under the base line and the forcing case. A numerical study was conducted by using RANS computations with a transition model for different forcing configurations. Results from this simulation indicated that when the tip gap was 2% of the chord and free stream velocity of 2.7 m/s, the strength of the tip leakage vortex was significantly attenuated for a blowing ratio of approximately 1. This attenuation was the result of a reverse flow in the tip gap where a standing vortex was found to form in the simulation. Comparing the base line with the steady forcing cases demonstrates the success the DBD actuators to mitigate the TLV.
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 Dbd Plasma Actuators for Flow Control in Air Vehicles and Jet Engines by : Nasa Technical Reports Server (Ntrs)
Download or read book Dbd Plasma Actuators for Flow Control in Air Vehicles and Jet Engines written by Nasa Technical Reports Server (Ntrs) and published by BiblioGov. This book was released on 2013-06 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: The NASA Technical Reports Servcr (NTRS) houses half a million publications that are a valuable means of information to researchers, teachers, students, and the general public. These documents are all aerospace related with much scientific and technical information created or funded by NASA. Some types of documents include conference papers, research reports, meeting papers, journal articles and more. This is one of those documents.
Book Synopsis Recent Progress in Some Aircraft Technologies by : Ramesh K. Agarwal
Download or read book Recent Progress in Some Aircraft Technologies written by Ramesh K. Agarwal and published by BoD – Books on Demand. This book was released on 2016-09-08 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book describes the recent progress in some engine technologies and active flow control and morphing technologies and in topics related to aeroacoustics and aircraft controllers. Both the researchers and students should find the material useful in their work.
Book Synopsis Active Flow Control by Using Plasma Actuators by : Gabriele Neretti
Download or read book Active Flow Control by Using Plasma Actuators written by Gabriele Neretti and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Active flow control has recently received an increasing attention since it allows to directly manipulate the flow-field around a surface only when it is effectively requested. Aerodynamic plasma actuators supplied by a dielectric barrier discharge (DBD) can be used for this purpose. Usually, sinusoidal voltages in the range 5-50 kV peak and frequencies between 1 and 100 kHz are utilized to ignite this plasma typology. The surface discharge produced by these devices is able to tangentially accelerate the flow field by means of the electrohydrodynamic (EHD) interaction. DBDs generate non-thermal plasmas characterized by low input energies and limited temperature increments. Plasma actuators can be easily designed by following the shape of the aerodynamic body and can be used over heat-sensitive surfaces. These aerodynamic devices have demonstrated to produce boundary layer modifications with induced speeds up to 10 m/s. Their use over airfoils, flaps, and blades have shown the possibility to delay the transition between laminar to turbulent regime, to prevent flow separation enhancing lift and reducing drag. Moreover, the adoption of these actuators over landing gears and trailing edges may induce a noise reduction effect. Dielectric materials, electrodes configuration, and supplying waveforms are most relevant parameters to be considered to enhance actuator performance. On a parallel plane, on/off actuation strategy is a key point in the use of these devices when utilized over aerodynamic surfaces impinged within an external flow.
Book Synopsis AIAA Journal by : American Institute of Aeronautics and Astronautics
Download or read book AIAA Journal written by American Institute of Aeronautics and Astronautics and published by . This book was released on 2007 with total page 960 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Optimization of Boundary-layer Control Using Dielectric Barrier Discharge Plasma Actuators by : Régis Sperotto de Quadros
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:
Download or read book Science in China written by and published by . This book was released on 2008 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Investigation of Crossflow Transition Control Using Plasma Actuators by : Philipp Dörr
Download or read book Numerical Investigation of Crossflow Transition Control Using Plasma Actuators written by Philipp Dörr and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High-lift Airfoil Separation Control with Dielectric Barrier Discharge Plasma Actuators by : Jesse Little
Download or read book High-lift Airfoil Separation Control with Dielectric Barrier Discharge Plasma Actuators written by Jesse Little and published by . This book was released on 2010 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: This work examines the performance of dielectric barrier discharge (DBD) plasma actuators for controlling separation from the leading edge and trailing edge flap shoulder of a supercritical high-lift airfoil. DBD plasma actuators driven by both typical AC voltages (AC-DBD) and more developmental nanosecond duration pulses (NS-DBD) are investigated. Characterization of the two actuators shows that very different behavior is created when exciting the plasma discharge using these two waveforms. The AC-DBD plasma actuator functions through electrohydrodynamic effects that introduce zero net mass, but nonzero net momentum into the flow. Conversely, the electrohydrodynamic effects of the NS-DBD are quite weak suggesting thermal effects from rapid localized heating by the plasma are responsible for control authority. The performance of both devices as separation control actuators is tested on a high-lift airfoil system. The AC-DBD is effective for controlling turbulent boundary layer separation from a deflected trailing edge flap between Reynolds numbers of 240,000 and 750,000. Momentum coefficients for the AC-DBD plasma actuator are generally an order of magnitude lower than those usually employed for such studies yet control authority is still realized through amplification of natural vortex shedding from the flap shoulder. The corresponding lift enhancement is primarily due to upstream effects from increased circulation around the entire model rather than full separated flow reattachment to the deflected flap surface. Lift enhancement via instability amplification is found to be relatively insensitive to changes in angle of attack provided that the separation location and underlying dynamics do not change. Control authority decreases with increasing Reynolds number and flap deflection highlighting the necessity for further optimization of AC-DBD plasma actuators for use in realistic takeoff and landing transport aircraft applications. As a whole, these findings compare favorably to studies on a similar high-lift platform using piezoelectric driven zero net mass flux actuation. The NS-DBD plasma actuator is ineffective for controlling separation from the deflected trailing edge flap. However, the device is found to be superior to the tested AC-DBD plasma actuators for controlling leading edge separation and rivals the performance of a passive droop by extending the stall angle by six degrees in the Reynolds number range 750,000-1,000,000. Detailed flow diagnostics show the NS-DBD plasma actuator functions as an active trip for pre-stall incidence angles and generates coherent spanwise vortices that entrain freestream momentum into the separated region at post-stall angles. These structures are generated across all surveyed frequencies, but optimal dimensionless frequencies for controlling separation are in the range four to six depending on the incidence angle. The contrasting performance of the NS-DBD plasma actuator at the leading and trailing edge in comparison to the AC-DBD is discussed and recommendations for future work are provided.
