Investigation of Laser Applications in Gas Dynamic Studies PDF Download

Author: Lawrence W. Hicks
Publisher:
ISBN:
Category : Gas dynamics
Languages : en
Pages :

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Author: Darshan Dosanjh
Publisher: Springer Science & Business Media
ISBN: 1468419234
Category : Science
Languages : en
Pages : 303

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This volume is based on material prepared by the contributors to the symposium on "Progress in Gas Dynamic Research by Optical Methods", held on May 25-26, 1970 in the Department of Mechanical and Aerospace Engineering at Syracuse University. The contents focus on experimental and analytical aspects of contemporary op tical methods as applied in modern research on high speed and/or high temperature gaseous flows. State of the art, recent research results and possible research applications of spectroscopy, spectral interferometry, pulse laser holographic interferometry, laser as a diagnostic and plasma generating tool and the analysis of plasma by light scattering constitute part of the subject matter of this vol ume. The emerging importance and impact of recent laser developments on optical diagnostics of gas dynamic and gas-physics phenomena is a recurring theme throughout the volume. Diverse applications of the shock tube to process gases to high temperature equilibrium conditions and the study of important char acteristics of these radiating gases by contemporary spectroscopic methods are discussed in papers by Nicholls, Wurster and Wares, et al. Refractivity index measurements have long been extensively used for investigating gas dynamic and aerodynamic flows. However, the recent availability of the laser as a light source has brought sig nificant improvements in the more conventional optical methods such as schlieren photography and interferometry as reported here in Alcock's paper. More recent laser developments have resulted in several com pletely new optical diagnostic methods.

Author: John D. Jr. Anderson
Publisher: Elsevier
ISBN: 0323160441
Category : Technology & Engineering
Languages : en
Pages : 193

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Gasdynamic Lasers: An Introduction is a 12-chapter introductory text to major development generations of gasdynamic lasers, focusing on their underlying physical and fundamental aspects. The opening chapters discuss the basic detailed physical phenomena that ultimately are responsible for producing gasdynamic laser action and the methods of calculating the performance of these devices. These topics are followed by a chapter on confirmation of the performance calculations through arc and shock tunnel experiments. The discussion then shifts to vibrational relaxation process behind normal shock waves in CO2-N2-He mixtures and assesses their population inversions occurring in the nonequilibrium flow. Other chapters explore the concepts of downstream mixing and optical cavity in gasdynamic lasers, as well as the laser beam extracted from these devices. A systematic study of aerodynamic windows that use supersonic flow across the aperture is presented in the concluding chapters, along with the phenomena associated with gasdynamic laser diffusers. This introductory text will be of great value to professional scientists and engineers, as well as to students and workers in the field who are interested in interdisciplinary applied science.

Author: A. L. Addy
Publisher:
ISBN:
Category : Chemical lasers
Languages : en
Pages : 219

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Author: Roger A. Tennant
Publisher:
ISBN:
Category :
Languages : en
Pages : 76

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This report describes the design, instrumentation and operation of two intermittent facilities for Gas Dynamic Laser research. Intermittent facilities have the attractive characteristics of very low cost, configuration flexibility, and ease of conducting tests with a large dynamic range of initial conditions. The kinetics of vibrational freezing in gas dynamic laser nozzles was studied. Small signal gain, static temperature, pressure and Mach number were measured downstream of the nozzle exit. Results for different mixtures, total temperatures, and area ratio changes are presented. Results of a research program to study the effects of contraction ratio, length, and wedge angle on the performance of a vane diffuser are presented. The effects of promoting early boundary layer transition are shown to be important in vane diffusers. A separate study was performed to determine the effects of impulsive starting vane diffusers compared with quasi-steady starting. The results conclusively show no change of start or unstart performance due to impulsive operation.

Author: John David Anderson (Jr.)
Publisher:
ISBN:
Category : Gas lasers
Languages : en
Pages : 102

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A previous time-dependent finite-difference numerical solution of second order accuracy for quasi-one-dimensional nonequilibrium nozzle flows using 3 terms of a Taylor's series expansion in time is modified such that only 2 terms of a series expansion are required for second order accuracy. As a result, an already straightforward analysis of nonequilibrium nozzle flows is made even simpler. With the present solution, numerical experiments are carried out for gas dynamic laser flows in order to study the consequences of large H2O content, high reservoir pressures and small nozzle throat heights. (Author).

Author: Masamori Endo
Publisher: CRC Press
ISBN: 1351837192
Category : Technology & Engineering
Languages : en
Pages : 607

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Book Description
Lasers with a gaseous active medium offer high flexibility, wide tunability, and advantages in cost, beam quality, and power scalability. Gas lasers have tended to become overshadowed by the recent popularity and proliferation of semiconductor lasers. As a result of this shift in focus, details on modern developments in gas lasers are difficult to find. In addition, different types of gas lasers have unique properties that are not well-described in other references. Collecting expert contributions from authorities dealing with specific types of lasers, Gas Lasers examines the fundamentals, current research, and applications of this important class of laser. It is important to understand all types of lasers, from solid-state to gaseous, before making a decision for any application. This book fills in the gaps by discussing the definition and properties of gaseous media along with its fluid dynamics, electric excitation circuits, and optical resonators. From this foundation, the discussion launches into the basic physics, characteristics, applications, and current research efforts for specific types of gas lasers: CO lasers, CO2 lasers, HF/DF lasers, excimer lasers, iodine lasers, and metal vapor lasers. The final chapter discusses miscellaneous lasers not covered in the previous chapters. Collecting hard-to-find material into a single, convenient source, Gas Lasers offers an encyclopedic survey that helps you approach new applications with a more complete inventory of laser options.

Author: NAVAL ORDNANCE LAB WHITE OAK MD.
Publisher:
ISBN:
Category :
Languages : en
Pages : 75

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A gas dynamic laser system was designed and put in operation at the U.S. Naval Ordnance Laboratory by modifying the 3 Megawatt Arc Tunnel. Independent analytical studies assisted in the design of the experiments. Comparison of analytical prediction and experiments, which were carried out under less than ideal conditions, give fair to very good agreement. Further experiments have been designed on the basis of the current investigations. (Author).

Author: Anatoliĭ Nikolaevich Oraevskiĭ
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 304

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Author: United States. Energy Research and Development Administration
Publisher:
ISBN:
Category :
Languages : en
Pages : 900

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