Author: Constandinos Miltiadis MitsingasPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Reactive Flow Visualization Through High-speed Optical Laser Diagnostics
Author: Constandinos Miltiadis MitsingasPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Optical Methods in Flow & Particle Diagnostics
Author: Optical Diagnostics for Flow Processes
Author: P. BuchhavePublisher: Springer Science & Business Media
ISBN: 1489912711
Category : Science
Languages : en
Pages : 387
Book Description
The origin of optical methods for fluid flow investigations appears to be nontraceable. This is no matter for surprise. After all seeing provides the most direct and common way for humans to learn about their environment. But at the same time some of the most sophisticated methods for doing measurements in fluids are also based on light and often laser light. A very large amount of material has been published in this area over the last two decades. Why then another publication? Well, the field is still in a state of rapid development. It is characterised by the use of results and methods developed within very different areas like optical physics, spectroscopy, communication systems, electronics and computer science, mechanical engineering, chemical engineering and, of course, fluid dynamics. We are not aware of a book containing both introductory and more advanced material that covers the same material as presented here. The book is the result of a compilation and expansion of material presented at a summer school on Optical Diagnosticsfor Flow Processes,held at RiS0 National Laboratory and the Technical University of Denmark in September 1993. The aim of the course was to provide a solid background for understanding, evaluating, and using modem optical diagnostic methods, addressing Ph. D. students and researchers active in areas of fluid flow research. The disciplines represented by the participants ranged from atmospheric fluid dynamics to biomedicine.
Advanced Diagnostics and Instrumentation for Chemically Reactive Flow Systems
Author: R. K. HansonPublisher:
ISBN:
Category :
Languages : en
Pages : 53
Book Description
Progress is reported at the completion of two years of an interdisciplinary program to investigate and establish modern diagnostic techniques for application to reacting flows. Project areas include: (1) optical probes for species measurements employing tunable ultraviolet, visible and infrared laser sources; (2) coherent anti-Stokes Raman spectroscopy (CARS) for temperature and velocity measurements in a supersonic jet; (3) computed absorption tomography for species measurements in a plane; (4) particle sizing techniques, especially for rocket exhausts; (5) fast-response temperature monitor, based on line-reversal concepts; (6) quantitative flow visualization, including temporally and spatially resolved species measurements in a plane using laser-induced fluorescence; (7) multiple-point velocity visualization; (8) application of modern diagnostics to a two-dimensional reacting shear layer; (9) development of measurement techniques and a novel facility for investigations of droplet evaporation in turbulent flows; (10) holographic display techniques for 3-D visualization of flowfield data; (11) spatially resolved laser absorption spectroscopy using optical Stark shifting; and (12) fast-scanning dye laser for measurements of species, temperature and fundamental spectral parameters. (Author).
Scientific and Technical Aerospace Reports
Author: Progress in Combustion Diagnostics, Science and Technology
Author: Paul MedwellPublisher: MDPI
ISBN: 3039285106
Category : Technology & Engineering
Languages : en
Pages : 336
Book Description
The role that combustion plays in the world’s energy systems will continue to evolve with the changes in technological demands. For example, the challenges that we face today are more focused on the conservation of energy and addressing environmental concerns, which together necessitate cleaner and more efficient combustion processes using a range of fuel sources. This book includes contributions to highlight the recent progress in theory and experiments, development, and demonstration of technologies and systems involving combustion processes, for the production, storage, use, and conservation of energy.
A Study of High Speed Flows Using Advanced Optical Diagnostics
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Over the past few years, we have been working on the development of advanced optical diagnostics to be used in high speed flows. Our focus has been on the techniques based on molecular absorption filters. The focus of this report is on the details of a two-component planar measurement that we call Planar Doppler Velocimetry (PDV) technique. A PDV technique was developed and used to measure two components of instantaneous velocity in an ideally expanded, Mach 2, free jet. The technique utilizes a molecular filter as a frequency discriminator and uses two cameras to resolve two components of velocity on a plane that is illuminated by a laser sheet. Careful formation of the laser sheet, proper calibration of the splitter/recombiner imaging system and precise image registration were found to be critical steps in the technique. The velocity measurements obtained with this technique were compared with reference LDV measurements taken in the same flowfield. The mean velocity results were in very good agreement with the reference measurements and the turbulence results captured only the correct trend. A detailed error analysis describes the error sources inherent in the PDV technique. For the current two-component PDV system the estimated uncertainty for the mean velocity was better than +/-5%. Methods to improve the technique are discussed.
Advanced Diagnostics for Reacting Flows
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 36
Book Description
Progress is reported for the past year of an interdisciplinary program aimed at establishing advanced optical diagnostic techniques applicable to combustion gases and plasmas, with some emphasis on high speed flows. The primary flowfield parameters of interest are species concentrations (including electrons), temperature, mass density, pressure, and velocity, and quantities derivable from these parameters such as mass flow rate (from the product of density and velocity). The techniques under study are based on laser spectroscopy, particularly laser absorption and laser-induced fluorescence, with the latter capable of providing both single-point and multi-point (2-d and 3-d) measurements. Laser sources include tunable cw lasers (ring dye and semiconductor diode lasers) and tunable pulsed lasers (excimer-pumped dye and narrow-linewidth excimer). The cw lasers are spectrally narrow, allowing study of a new class of techniques based on spectral lineshapes and shifts, while the pulsed lasers provide intense bursts of photons needed for techniques based on light-scattering phenomena. Accomplishments of note include: the first optical measurement of mass flux in high speed air flows; the first applications of tunable semiconductor diode lasers to absorption and fluorescence measurements in high temperature plasmas and supersonic flows, and to the measurement of water vapor in high temperature combustion gases; the first application of the planar laser-induced fluorescence (PLIF) technique to nonequilibrium shock tunnel flows; and further advances in the development of shock tube diagnostics for rate constant measurements of elementary combustion reactions. Laser, Imaging, Combustion, Velocity, Pressure, Temperature, Fluorescence, Reacting, Flow, Plasma.
New Trends in Instrumentation for Hypersonic Research
Author: A. BoutierPublisher: Springer Science & Business Media
ISBN: 9401118280
Category : Science
Languages : en
Pages : 612
Book Description
Because of the growing interest in hypersonic flows, the AGARD Fluid Dynamics Panel initiated a sub-working group on instrumentation for hypersonics in 1989. This sub-group, chaired by J. WENDT (VKI -Belgium), was composed of: A. BOUTIER (ONERA -France), K. BUTEFISCH (DLR -Germany), R. CATTOLICA (SANDIA Lab. -USA), V. CLINE (AEDC -USA), A. GIRARD (ONERA -France), R. McKENZIE (NASA Ames -USA), S. OCHELTREE (NASA Langley -USA) and G. SMEETS (ISL -Franco-German Inst.). As a result of several meetings, the idea came to organize this workshop, 27th April - 1st May 1992, on "New Trends in Instrumentation for Hypersonic Research", at Le Fauga-Mauzac ONERA center, in France, where the new hot-shot arc-heated facility F4, as well as a new conference building, were recently completed. This workshop has been organized in close connection with the AGARD FDP Symposium to be held in Torino 4 - 8 May 1992 on "Theoretical and Experimental Methods in Hypersonic Flows": the main conclusions and ideas expressed by the papers and during the discussions of this workshop are reported in session 7 and have been presented in Torino in a special Instrumentation session. As chairman of this workshop, I express many thanks to the Organizing Committee composed of Karl BUTEFISCH, Andre GIRARD, Stewart OCHELTREE and John WENDT for their very constructive help, leading to a meeting that was recognized to be very fruitful for all the participants.
Flow Visualization Using Laser-induced Fluorescence
Author: Claude Carlos WhitePublisher:
ISBN:
Category : Diffusion in hydrology
Languages : en
Pages : 76
Book Description