Equilibrium Normal Shock Properties for Vibrationally Excited CO2-N2-He Gas Mixtures
Equilibrium Normal Shock Properties for Vibrationally Excited CO2-N2-He Gas Mixtures

Author: Michael T. Madden

Publisher:

Published: 1970

Total Pages: 102

ISBN-13:

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Results are given for equilibrium properties behind incident and reflected normal shock waves in CO2-N2-He mixtures wherein the gas may be vibrationally excited but not chemically reacting. A rapid numerical iterative analysis is described, and the results are given in simple graphical form for convenient use in shock tube and shock tunnel experiments. The results are anticipated to be of particular use in determining reservoir conditions for shock tunnel experiments dealing with vibrational population inversions in rapidly expanding mixtures. (Author).

EQUILIBRIUM NORMAL SHOCK PROPERTIES FOR VIBRATIONALLY EXCITED CO2-N2-He GAS MIXTURES.
EQUILIBRIUM NORMAL SHOCK PROPERTIES FOR VIBRATIONALLY EXCITED CO2-N2-He GAS MIXTURES.

Author: Michael T. Madden

Publisher:

Published: 1970

Total Pages: 74

ISBN-13:

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Results are given for equilibrium properties behind incident and reflected normal shock waves in CO2-N2-He mixtures wherein the gas may be vibrationally excited but not chemically reacting. A rapid numerical iterative analysis is described, and the results are given in simple graphical form for convenient use in shock tube and shock tunnel experiments. The results are anticipated to be of particular use in determining reservoir conditions for shock tunnel experiments dealing with vibrational population inversions in rapidly expanding mixtures. (Author).

Vibrational Population Inversions Within Normal Shock Waves in CO2-N2-He Mixtures
Vibrational Population Inversions Within Normal Shock Waves in CO2-N2-He Mixtures

Author: John David Anderson (Jr.)

Publisher:

Published: 1970

Total Pages: 74

ISBN-13:

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Numerical solutions are given for vibrational population inversions created in CO2-N2-He mixtures due to shock wave heating of a cold gas. The results indicate that population inversions between the (040) and (001) energy levels of CO2 and, to a lesser degree, between the (200) and (001) levels, can be created in the vibrational nonequilibrium flow behind a normal shock front. The properties of these inversions as a possible laser medium are assessed; the results indicate that the laser properties of this shock-induced nonequilibrium flow are not as promising as those of lasers operating on the principle of rapid expansions. (Author).

Gasdynamic Lasers: An Introduction
Gasdynamic Lasers: An Introduction

Author: John D. Jr. Anderson

Publisher: Elsevier

Published: 2012-12-02

Total Pages: 193

ISBN-13: 0323160441

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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.

Population Inversions in an Expanding Gas
Population Inversions in an Expanding Gas

Author: John David Anderson (Jr.)

Publisher:

Published: 1971

Total Pages: 80

ISBN-13:

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It is well established that population inversions between the (001) and (100) vibrational energy levels of CO2 can be created by rapid expansions of CO2-N2-H2O or He mixtures through supersonic nozzles. New experimental results are presented for such inversions. These experiments were conducted in both the 3-Megawatt Arc Tunnel and the 12.7 cm Shock Tunnel at the Naval Ordnance Laboratory. The results support previously published theoretical predictions obtained with a numerical, time-dependent, nonequilibrium nozzle flow analysis employing a simplified vibrational kinetic model. This theory is also compared with experimental data obtained by other investigators. (Author).

Scientific and Technical Aerospace Reports
Scientific and Technical Aerospace Reports

Author:

Publisher:

Published: 1975

Total Pages: 970

ISBN-13:

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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Interferometric Studies of the Flow in Fast-expanding Nozzles
Interferometric Studies of the Flow in Fast-expanding Nozzles

Author: Robert A. Leverance

Publisher:

Published: 1973

Total Pages: 58

ISBN-13:

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Interferometric studies have been performed in the test section of the Naval Ordnance Laboratory (NOL) 127 mm shock tunnel under conditions that closely simulate the flow in a gas dynamic laser (GDL) cavity. A Mach-Zehnder interferometer has been used to determine the density distribution in two nozzle configurations. In a two-dimensional fast-expanding nozzle, time-resolved interferograms were obtained at 200 microsecond intervals. For a multiple nozzle module interferograms were obtained in two mutually perpendicular directions. The experimental setup is described and the results are discussed. (Author).