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Active Control Of Supersonic Impinging Jets Using Supersonic Microjets
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Book Synopsis Active Control of Supersonic Impinging Jets Using Supersonic Microjets by : Farrukh S. Alvi
Download or read book Active Control of Supersonic Impinging Jets Using Supersonic Microjets written by Farrukh S. Alvi and published by . This book was released on 2005 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive experimental investigation on the use of microjets for the control of supersonic impinging jets was conducted under this research program. Supersonic impinging jets occur in many applications including in STOVL aircraft where they lead to a highly oscillatory flow with very high unsteady loads on the nearby aircraft structures and the landing surfaces. Prior research has shown that microjets, placed around the main jet periphery, are very effective in reducing the flow unsteadiness and the associated dynamic loads. In the present work, our goal was to better understand the physical properties of supersonic impinging jets through detailed experiments and to develop optimal open and closed-loop control strategies in order to produce efficient control over the range of conditions impinging jet-related problems are significant.
Book Synopsis Active Control of Supersonic Impinging Jets Using Microjets by : F. S. Alvi
Download or read book Active Control of Supersonic Impinging Jets Using Microjets written by F. S. Alvi and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Active Control of Supersonic Impinging Jets Using Supersonic Microjets by :
Download or read book Active Control of Supersonic Impinging Jets Using Supersonic Microjets written by and published by . This book was released on 2003 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Supersonic impinging jet flows, such as those that occur in the next generation of STOVL aircraft, are highly unsteady due to the presence a feedback loop. This results in large dynamic loads on the nearby aircraft structures and surfaces and diminishes aircraft performance. In this study, a unique active control technique that utilizes arrays of supersonic microjets (less than or equal 400 micrometers) around the periphery of the main jet was examined. The efficacy of microjet control was explored over a large parametric range. This control approach was very successful and the activation of the microjets led to dramatic reductions in ground effect. The lift loss was reduced by up to 40%, while the unsteady loads were reduced by as much as 12 dB. These dramatic gains in performance were achieved with negligible microjet mass flux (less than 0.5%). A detailed study of this flow was conducted to better understand the governing flow physics. The velocity field data clearly indicates that the activation of microjets generates significant streamwise vorticity while reducing the azimuthal vorticity of the primary jet It is proposed that the streamwise vorticity is mainly a result of the redirection of the azimuthal vorticity, which weakens the large-scale structures in the primary jet. This is considered to be a primary factor in the efficient disruption of the feedback loop. A new, POD-based, closed-loop control strategy, is also explored in order to achieve optimal and uniform control. The closed-loop control results led to an improvement in the control efficiency compared to the open-loop strategy in a number of cases.
Book Synopsis Active Control of Hot, Supersonic Impinging Jets Using Microjets by : Sladana Lazic
Download or read book Active Control of Hot, Supersonic Impinging Jets Using Microjets written by Sladana Lazic and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The current studies attempt to examine and investigate the flow properties of a hot supersonic impinging jet issuing from a convergent-divergent, Mach 1.5 nozzle and operating at more realistic, higher temperatures, . This ideally expanded jet was heated up to a stagnation temperature of ~500K. The jet is impinging on a flat plate, called the ground plate that is appropriately larger than the nozzle exit diameter. The ground plate can be moved vertically in order to simulate different hover heights.
Book Synopsis Active Control of Supersonic Impinging Jets by : A. Krothapalli
Download or read book Active Control of Supersonic Impinging Jets written by A. Krothapalli and published by . This book was released on 2001 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental studies of supersonic impinging jet flows suggest that they are greatly influenced by the flow-acoustic interactions through a feedback mechanism. The self-sustained oscillations of the jet column observed in theses flows result in high velocities in the ambient medium induced by the large-scale coherent vortical structures in the jet shear layers. As a consequence, the suck down force on the surface from which the jet is issuing can reach as high as 60% of the primary jet thrust. In addition, the overall sound pressure level (OASPL), increase significantly relative to a free jet. To alleviate these undesirable flow and acoustic characteristics, a novel control technique using supersonic microjets is demonstrated. Sixteen supersonic microjets are placed around the circumference of the main jet at the nozzle exit to disrupt the feedback mechanism. As a result, significant lift loss recovery( -50%) and reduced near field OASPL ( -7dB) are observed.
Book Synopsis Active Noise Control in Supersonic Impinging Jets Using Pulsed Microjets by : Jae Jeen Choi
Download or read book Active Noise Control in Supersonic Impinging Jets Using Pulsed Microjets written by Jae Jeen Choi and published by . This book was released on 2006 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) It was observed that the pulsed microjet was able to bring about the same noise reduction as steady injection using approximately 40% of the corresponding mass flow rate of the steady microjet case. Moreover, as the duty cycle increased, the performance of pulsed injection was further enhanced and was observed to completely eliminate the impinging tones at all operating conditions. In order to obtain an optimal performance of the actuator, a new model of the impinging jet flow field is suggested based on a collision model of two identical vortices. In addition to the colliding vortex model, a two-mode feedback model that captures both the low and high-frequency Rossiter mode was suggested to investigate the role of pulsed microjet in the feedback loop. Due to the fact that a low frequency pulsing (16.4 Hz) brought about additional reduction compared to high frequency pulsing, the presence of low frequency mode is identified. In the context of the analytic model, the effect of pulsing is modeled using a input-shaping controller that accomplishes noise-reduction through a suitable redistribution of the acoustic excitation over the high and low frequencies.
Book Synopsis Active Noise Control of Supersonic Impinging Jet Using Pulsed Microjets by : Seung Hyuck Hong
Download or read book Active Noise Control of Supersonic Impinging Jet Using Pulsed Microjets written by Seung Hyuck Hong and published by . This book was released on 2009 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis concerns an active noise control of supersonic impinging jet flow using unsteady microjet injection. Supersonic impinging jet involves several problems such as lift loss, ground erosion, significant noise pollution, and sonic fatigue, all of which are dominated by impinging tones mainly caused by well-known phenomenon, the feed back loop. The main goal of this study is to achieve uniform and consistent noise reduction in the entire range of jet operating condition, by means of intercepting this feed back loop. Experimental investigations on ideally expanded Mach number 1.5, supersonic impinging jet flow were carried out at the scaled supersonic experimental facility. The actuator used for active control is composed of pulsed microjets, utilizing a fraction of mass flow rate needed with steady microjets. Two means of producing pulsed microjet were introduced; one with a rotating cap, pulsing at 16 - 100Hz, and the other developed based on the principle of Hartmann tube, pulsing at 4.4 - 6.1kHz, referred to as high frequency actuator. Control parameters related to pulsed microjet injection with rotating cap were varied to evaluate their effects on suppression of impinging tones, whereas the effect of high frequency actuator is shown only as an initial step and needs further investigation in the future. For pulsed microjet with rotating cap, mass flow rate, directly proportional to the supply pressure of microjet, is found to be the most important parameter amongst all and saturated supply pressures for steady and pulsed microjet are demonstrated. It is demonstrated that pulsed microjet gives more noise reduction than steady microjet with the same mass flow rate, at certain range of supply pressure, and also that pulsed microjet could be as effective on suppression of impinging tones as steady microjet with less mass flow rate. In addition, the effect of pulsed microjet on hot temperature impinging jet was examined since the jet is much hotter than ambient air in reality. The concept of extremum control strategy is introduced to more efficiently find an optimal pulsing condition for uniform and consistent noise reduction.
Book Synopsis Control of Supersonic Impinging Jets Using Microjets by : Huadong Lou
Download or read book Control of Supersonic Impinging Jets Using Microjets written by Huadong Lou and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Active Control of Supersonic Impingement Tones Using Microjets by : Jae Jeen Choi
Download or read book Active Control of Supersonic Impingement Tones Using Microjets written by Jae Jeen Choi and published by . This book was released on 2003 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Active Control of Supersonic Impinging Jets by : H. Lou
Download or read book Active Control of Supersonic Impinging Jets written by H. Lou and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Active Flow and Combustion Control 2018 by : Rudibert King
Download or read book Active Flow and Combustion Control 2018 written by Rudibert King and published by Springer. This book was released on 2018-09-03 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book reports on the latest theoretical and experimental findings in the field of active flow and combustion control. It covers new developments in actuator technology and sensing, in robust and optimal open- and closed-loop control, as well as in model reduction for control, constant volume combustion and dynamic impingement cooling. The chapters reports oncutting-edge contributions presented during the fourth edition of the Active Flow and Combustion Control conference, held in September 19 to 21, 2018 at the Technische Universität Berlin, in Germany. This conference, as well as the research presented in the book, have been supported by the collaborative research center SFB 1029 on “Substantial efficiency increase in gas turbines through direct use of coupled unsteady combustion and flow dynamics”, funded by the DFG (German Research Foundation). It offers a timely guide for researchers and practitioners in the field of aeronautics, turbomachinery, control and combustion.
Book Synopsis Active-adaptive Control of Acoustic Resonances in Supersonic Impinging Jets by : Anuradha Annaswamy
Download or read book Active-adaptive Control of Acoustic Resonances in Supersonic Impinging Jets written by Anuradha Annaswamy and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Control Handbook by : William S. Levine
Download or read book The Control Handbook written by William S. Levine and published by CRC Press. This book was released on 2018-10-08 with total page 944 pages. Available in PDF, EPUB and Kindle. Book excerpt: At publication, The Control Handbook immediately became the definitive resource that engineers working with modern control systems required. Among its many accolades, that first edition was cited by the AAP as the Best Engineering Handbook of 1996. Now, 15 years later, William Levine has once again compiled the most comprehensive and authoritative resource on control engineering. He has fully reorganized the text to reflect the technical advances achieved since the last edition and has expanded its contents to include the multidisciplinary perspective that is making control engineering a critical component in so many fields. Now expanded from one to three volumes, The Control Handbook, Second Edition organizes cutting-edge contributions from more than 200 leading experts. The second volume, Control System Applications, includes 35 entirely new applications organized by subject area. Covering the design and use of control systems, this volume includes applications for: Automobiles, including PEM fuel cells Aerospace Industrial control of machines and processes Biomedical uses, including robotic surgery and drug discovery and development Electronics and communication networks Other applications are included in a section that reflects the multidisciplinary nature of control system work. These include applications for the construction of financial portfolios, earthquake response control for civil structures, quantum estimation and control, and the modeling and control of air conditioning and refrigeration systems. As with the first edition, the new edition not only stands as a record of accomplishment in control engineering but provides researchers with the means to make further advances. Progressively organized, the other two volumes in the set include: Control System Fundamentals Control System Advanced Methods
Book Synopsis The Control Handbook (three volume set) by : William S. Levine
Download or read book The Control Handbook (three volume set) written by William S. Levine and published by CRC Press. This book was released on 2018-10-08 with total page 3526 pages. Available in PDF, EPUB and Kindle. Book excerpt: At publication, The Control Handbook immediately became the definitive resource that engineers working with modern control systems required. Among its many accolades, that first edition was cited by the AAP as the Best Engineering Handbook of 1996. Now, 15 years later, William Levine has once again compiled the most comprehensive and authoritative resource on control engineering. He has fully reorganized the text to reflect the technical advances achieved since the last edition and has expanded its contents to include the multidisciplinary perspective that is making control engineering a critical component in so many fields. Now expanded from one to three volumes, The Control Handbook, Second Edition brilliantly organizes cutting-edge contributions from more than 200 leading experts representing every corner of the globe. They cover everything from basic closed-loop systems to multi-agent adaptive systems and from the control of electric motors to the control of complex networks. Progressively organized, the three volume set includes: Control System Fundamentals Control System Applications Control System Advanced Methods Any practicing engineer, student, or researcher working in fields as diverse as electronics, aeronautics, or biomedicine will find this handbook to be a time-saving resource filled with invaluable formulas, models, methods, and innovative thinking. In fact, any physicist, biologist, mathematician, or researcher in any number of fields developing or improving products and systems will find the answers and ideas they need. As with the first edition, the new edition not only stands as a record of accomplishment in control engineering but provides researchers with the means to make further advances.
Book Synopsis Micro- and Nanoflows by : Valery Ya. Rudyak
Download or read book Micro- and Nanoflows written by Valery Ya. Rudyak and published by Springer. This book was released on 2018-04-18 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes physical, mathematical and experimental methods to model flows in micro- and nanofluidic devices. It takes in consideration flows in channels with a characteristic size between several hundreds of micrometers to several nanometers. Methods based on solving kinetic equations, coupled kinetic-hydrodynamic description, and molecular dynamics method are used. Based on detailed measurements of pressure distributions along the straight and bent microchannels, the hydraulic resistance coefficients are refined. Flows of disperse fluids (including disperse nanofluids) are considered in detail. Results of hydrodynamic modeling of the simplest micromixers are reported. Mixing of fluids in a Y-type and T-type micromixers is considered. The authors present a systematic study of jet flows, jets structure and laminar-turbulent transition. The influence of sound on the microjet structure is considered. New phenomena associated with turbulization and relaminarization of the mixing layer of microjets are discussed. Based on the conducted experimental investigations, the authors propose a chart of microjet flow regimes. When addressing the modeling of microflows of nanofluids, the authors show where conventional hydrodynamic approaches can be applied and where more complicated models are needed, and they analyze the hydrodynamic stability of the nanofluid flows. The last part of the book is devoted the statistical theory of the transport processes in fluids under confined conditions. The authors present the constitutive relations and the formulas for transport coefficients. In conclusion the authors present a rigorous analysis of the viscosity and diffusion in nanochannels and in porous media.
Book Synopsis Microfluidics and Nanofluidics Handbook, 2 Volume Set by : Sushanta K. Mitra
Download or read book Microfluidics and Nanofluidics Handbook, 2 Volume Set written by Sushanta K. Mitra and published by CRC Press. This book was released on 2011-09-20 with total page 1767 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive, two-volume handbook on Microfluidics and Nanofluidics, this text covers fundamental aspects, fabrication techniques, introductory materials on microbiology and chemistry, measurement techniques, and applications with special emphasis on the energy sector. Each chapter begins with introductory coverage to a subject and then narrows in on advanced techniques and concepts, thus making it valuable to students and practitioners. The author pays special attention to applications of microfluidics in the energy sector and provides insight into the world of opportunities nanotechnology has to offer. Figures, tables, and equations to illustrate concepts.
Book Synopsis Microfluidics and Nanofluidics Handbook by : Sushanta K. Mitra
Download or read book Microfluidics and Nanofluidics Handbook written by Sushanta K. Mitra and published by CRC Press. This book was released on 2016-04-19 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive handbook presents fundamental aspects, fabrication techniques, introductory materials on microbiology and chemistry, measurement techniques, and applications of microfluidics and nanofluidics. The second volume focuses on topics related to experimental and numerical methods. It also covers fabrication and applications in a variety of areas, from aerospace to biological systems. Reflecting the inherent nature of microfluidics and nanofluidics, the book includes as much interdisciplinary knowledge as possible. It provides the fundamental science background for newcomers and advanced techniques and concepts for experienced researchers and professionals.
