Broadband Microjet Flow Control Using Piezoelectric Actuators
Download Broadband Microjet Flow Control Using Piezoelectric Actuators full books in PDF, epub, and Kindle. Read online free Broadband Microjet Flow Control Using Piezoelectric Actuators ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Author | : Joshua Hogue |
Publisher | : |
Total Pages | : 61 |
Release | : 2011 |
Genre | : |
ISBN | : |
ABSTRACT: A piezohydraulic active flow control actuator is developed using a 400 [mu]m diameter micro jet that is capable of pulsing flow over a broad frequency range. The design of the piezohydraulic microjet is presented together with experimental results that demonstrate multiphysics system dynamic characteristics. The microjet actuator couples a piezoelectric stack actuator and a hydraulic circuit to amplify the stack actuator displacement to an amplitude that is necessary to throttle flow through the micro jet. Unsteady pressure measurements at the microjet exit are compared with the piezoelectric stack actuator displacement and voltage input to provide comparisons between internal electromechanical actuation and external pulsed flow behavior. High-speed micro-Schlieren imagery is also utilized to quantify the flow field. The results illustrate broadband supersonic pulsed microjet actuator performance using a piezohydraulic circuit.
Author | : |
Publisher | : |
Total Pages | : 720 |
Release | : 2009 |
Genre | : Nanostructures |
ISBN | : 9780791848975 |
A collection of 81 full-length, peer-reviewed technical papers that covers such topics as: Bio-inspired Smart Materials and Structures; Enabling Technologies and Integrated System Design; Multifunctional Materials; and, Structural Health Monitoring/NDE.
Author | : Fei Liu |
Publisher | : |
Total Pages | : |
Release | : 2008 |
Genre | : |
ISBN | : |
ABSTRACT: This thesis describes the development of a new piezohydraulic actuator for integration into a microjet flow control system. The piezohydraulic actuator utilizes a lead zirconate titanate (PZT) stack actuator and a hydraulic amplification design to achieve relatively large displacements required to control flow through a microjet with an orifice diameter of approximately 400 fým. Displacement amplification of 81 times the stack actuator displacement was achieved using a dual-diaphragm design to seal the fluid within a converging nozzle.
Author | : Matteo Orazi |
Publisher | : |
Total Pages | : |
Release | : 2014 |
Genre | : |
ISBN | : |
Author | : Christian Bolzmacher |
Publisher | : |
Total Pages | : 163 |
Release | : 2011 |
Genre | : |
ISBN | : 9783832297282 |
Author | : Jose Mathew |
Publisher | : |
Total Pages | : |
Release | : 2001 |
Genre | : |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 524 |
Release | : 2020-08-27 |
Genre | : Technology & Engineering |
ISBN | : 9783039368563 |
Author | : R. I. Sujith |
Publisher | : Springer Nature |
Total Pages | : 484 |
Release | : 2021-12-14 |
Genre | : Science |
ISBN | : 3030811352 |
This book systematically presents the consolidated findings of the phenomenon of self-organization observed during the onset of thermoacoustic instability using approaches from dynamical systems and complex systems theory. Over the last decade, several complex dynamical states beyond limit cycle oscillations such as quasiperiodicity, frequency-locking, period-n, chaos, strange non-chaos, and intermittency have been discovered in thermoacoustic systems operated in laminar and turbulent flow regimes. During the onset of thermoacoustic instability in turbulent systems, an ordered acoustic field and large coherent vortices emerge from the background of turbulent combustion. This emergence of order from disorder in both temporal and spatiotemporal dynamics is explored in the contexts of synchronization, pattern formation, collective interaction, multifractality, and complex networks. For the past six decades, the spontaneous emergence of large amplitude, self-sustained, tonal oscillations in confined combustion systems, characterized as thermoacoustic instability, has remained one of the most challenging areas of research. The presence of such instabilities continues to hinder the development and deployment of high-performance combustion systems used in power generation and propulsion applications. Even with the advent of sophisticated measurement techniques to aid experimental investigations and vast improvements in computational power necessary to capture flow physics in high fidelity simulations, conventional reductionist approaches have not succeeded in explaining the plethora of dynamical behaviors and the associated complexities that arise in practical combustion systems. As a result, models and theories based on such approaches are limited in their application to mitigate or evade thermoacoustic instabilities, which continue to be among the biggest concerns for engine manufacturers today. This book helps to overcome these limitations by providing appropriate methodologies to deal with nonlinear thermoacoustic oscillations, and by developing control strategies that can mitigate and forewarn thermoacoustic instabilities. The book is also beneficial to scientists and engineers studying the occurrence of several other instabilities, such as flow-induced vibrations, compressor surge, aeroacoustics and aeroelastic instabilities in diverse fluid-mechanical environments, to graduate students who intend to apply dynamical systems and complex systems approach to their areas of research, and to physicists who look for experimental applications of their theoretical findings on nonlinear and complex systems.
Author | : Ning Qin |
Publisher | : Springer Nature |
Total Pages | : 341 |
Release | : 2019-10-17 |
Genre | : Technology & Engineering |
ISBN | : 3030296881 |
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.
Author | : Mickaël Lallart |
Publisher | : BoD – Books on Demand |
Total Pages | : 266 |
Release | : 2011-08-23 |
Genre | : Science |
ISBN | : 9533074566 |
Ferroelectric materials have been and still are widely used in many applications, that have moved from sonar towards breakthrough technologies such as memories or optical devices. This book is a part of a four volume collection (covering material aspects, physical effects, characterization and modeling, and applications) and focuses on the application of ferroelectric devices to innovative systems. In particular, the use of these materials as varying capacitors, gyroscope, acoustics sensors and actuators, microgenerators and memory devices will be exposed, providing an up-to-date review of recent scientific findings and recent advances in the field of ferroelectric devices.