Acoustic Control Of Turbulent Jets PDF Download
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| Author | : A.S. Ginevsky |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 243 |
| Release | : 2012-11-02 |
| Genre | : Technology & Engineering |
| ISBN | : 3540399143 |
Download Acoustic Control of Turbulent Jets Book in PDF, ePub and Kindle
Results of experimental research on aerodynamic and acoustic control of subsonic turbulent jets by acoustic excitation are presented. It was demonstrated that these control methods, originated by authors, not only can intensify mixing (by acoustic irradiation at low frequency), but also notably ease it (at high-frequency irradiation). This research monograph presents the updated results of the authors supplemented by other investigations conducted in USA, Germany and Great Britain. The methods for the numerical simulation of subsonic turbulent jets under acoustic excitation are described in detail, and examples are reviewed of practical applications, including reduction of turbojet engine noise and acoustic control of self-sustained oscillations in wind tunnels.
| Author | : |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 1995 |
| Genre | : |
| ISBN | : |
Download Turbulent Flow Control Book in PDF, ePub and Kindle
The primary purpose of this project was to explore actuators, sensors, and control strategies for active control of turbulent jets and boundary layers. Potential applications of this work are to boundary layer control in aircraft and propulsion systems, which should be enabled by concurrent developments in MEMS fabrication technology. The present experiments were performed in a low-speed water flow, where the turbulence is large scale and slow, allowing easy measurement of flow properties and use of actuators and sensors that could be fabricated individually. A zero net mass flow actuator was developed and used in conjunction with wall stress sensors to demonstrate control of laminar flows containing steady and unsteady streamwise vorticies similar to those found in the near-wall region of turbulent boundary layers. Various closed loop control schemes, including an adaptive inverse neural net control, were explored. An early phase of the project was devoted to extension of work on control of round jets by acoustic excitation. It was shown that the jet direction and mixing can be strongly influenced by acoustic and fluidic actuation.
| Author | : Sundaram C. Venkitarama |
| Publisher | : |
| Total Pages | : 226 |
| Release | : 1981 |
| Genre | : Jet planes |
| ISBN | : |
Download An Acoustic Source Modeling Technique to Predict the Near Sound Field of Axisymmetric Turbulent Jets Book in PDF, ePub and Kindle
| Author | : Victor V. Kozlov |
| Publisher | : Springer |
| Total Pages | : 135 |
| Release | : 2015-11-30 |
| Genre | : Technology & Engineering |
| ISBN | : 3319269585 |
Download Visualization of Conventional and Combusting Subsonic Jet Instabilities Book in PDF, ePub and Kindle
Based on new information obtained on free microjets, this book explains the latest phenomena in flame evolution in the presence of a transverse acoustic field with round and plane propane microjet combustion. It gives an overview of recent experimental results on instability and dynamics of jets at low Reynolds numbers and provides the reader, step by step, with the milestones and recent advances in jet flow stability and combustion. Readers will also discover a clarification of the differences between top-hat and parabolic round and plane jet instability. Chapters demonstrate features of the interaction between jet and crossflow, and how experimental data testify to similarities of the perturbed flow patterns of laminar and turbulent round jets. A similar response of the jets to external acoustic oscillations is shown, as well as the peculiarities of the effect of a transverse acoustic field on downstream evolution of round and plane macro- and microjets. Basic features of round and plane, macro and micro jets' evolution affected by initial conditions at the nozzle outlet and by environmental perturbations are highlighted. Students of fluid mechanics will gain a solid foundation in hydrodynamic stability and combustion of subsonic jet flow and researchers will value the presentation of special aspects of instability and transition. The work treats both theoretical and practical facets, and it includes supplementary material such as PowerPoint multimedia notes based on results of laboratory scientific experiments.
| Author | : Christophe Brun |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 344 |
| Release | : 2009-03-07 |
| Genre | : Technology & Engineering |
| ISBN | : 3540899561 |
Download Numerical Simulation of Turbulent Flows and Noise Generation Book in PDF, ePub and Kindle
Large Eddy Simulation (LES) is a high-fidelity approach to the numerical simulation of turbulent flows. Recent developments have shown LES to be able to predict aerodynamic noise generation and propagation as well as the turbulent flow, by means of either a hybrid or a direct approach. This book is based on the results of two French/German research groups working on LES simulations in complex geometries and noise generation in turbulent flows. The results provide insights into modern prediction approaches for turbulent flows and noise generation mechanisms as well as their use for novel noise reduction concepts.
| Author | : Mohamed Gad-el-Hak |
| Publisher | : World Scientific |
| Total Pages | : 445 |
| Release | : 2006 |
| Genre | : Technology & Engineering |
| ISBN | : 9812564705 |
Download Transition and Turbulence Control Book in PDF, ePub and Kindle
This volume contains articles based on lectures given at the Workshop on Transition and Turbulence Control, hosted by the Institute for Mathematical Sciences, National University of Singapore, 8-10 December 2004. The lecturers included 13 of the world's foremost experts in the control of transitioning and turbulent flows. The chapters cover a wide range of subjects in the broad area of flow control, and will be useful to researchers working in this area in academia, government laboratories and industry. The coverage includes control theory, passive, active and reactive methods for controlling transitional and turbulent wall-bounded flows, noise suppression and mixing enhancement of supersonic turbulent jets, compliant coatings, modern flow diagnostic systems, and swept wing instabilities.
| Author | : W. C. Sperry |
| Publisher | : |
| Total Pages | : 150 |
| Release | : 1961 |
| Genre | : Noise |
| ISBN | : |
Download Fundamental Study of Jet Noise Generation and Suppression Book in PDF, ePub and Kindle
| Author | : |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 1995 |
| Genre | : |
| ISBN | : |
Download Turbulent Flow Control Book in PDF, ePub and Kindle
The primary purpose of this project was to explore actuators, sensors, and control strategies for active control of turbulent jets and boundary layers. Potential applications of this work are to boundary layer control in aircraft and propulsion systems, which should be enabled by concurrent developments in MEMS fabrication technology. The present experiments were performed in a low-speed water flow, where the turbulence is large scale and slow, allowing easy measurement of flow properties and use of actuators and sensors that could be fabricated individually. A zero net mass flow actuator was developed and used in conjunction with wall stress sensors to demonstrate control of laminar flows containing steady and unsteady streamwise vorticies similar to those found in the near-wall region of turbulent boundary layers. Various closed loop control schemes, including an adaptive inverse neural net control, were explored. An early phase of the project was devoted to extension of work on control of round jets by acoustic excitation. It was shown that the jet direction and mixing can be strongly influenced by acoustic and fluidic actuation.
| Author | : Sayan Biswas |
| Publisher | : Springer |
| Total Pages | : 230 |
| Release | : 2018-05-03 |
| Genre | : Technology & Engineering |
| ISBN | : 3319762435 |
Download Physics of Turbulent Jet Ignition Book in PDF, ePub and Kindle
This book focuses on developing strategies for ultra-lean combustion of natural gas and hydrogen, and contributes to the research on extending the lean flammability limit of hydrogen and air using a hot supersonic jet. The author addresses experimental methods, data analysis techniques, and results throughout each chapter and: Explains the fundamental mechanisms behind turbulent hot jet ignition using non-dimensional analysis Explores ignition characteristics by impinging hot jet and multiple jets in relation to better controllability and lean combustion Explores how different instability modes interact with the acoustic modes of the combustion chamber. This book provides a potential answer to some of the issues that arise from lean engine operation, such as poor ignition, engine misfire, cycle-to-cycle variability, combustion instability, reduction in efficiency, and an increase in unburned hydrocarbon emissions. This thesis was submitted to and approved by Purdue University.
| Author | : E. V. Vlasov |
| Publisher | : |
| Total Pages | : 20 |
| Release | : 1968 |
| Genre | : |
| ISBN | : |
Download Acoustic Effect on Aerodynamic Characteristics of a Turbulent Jet Book in PDF, ePub and Kindle
An experimental study was made of the effect of sound of various intensities and frequencies on the mean and pulsating flow characteristics of a submerged turbulent jet. It was shown that at a certain sound intensity and frequency it is possible either to intensify or attenuate turbulent mixing. In general, a low frequency sound increased the mixing process. An attenuation of the turbulent mixing process was noted in the presence of a high frequency sound and relatively low Reynolds numbers.
