Author: W. H. Beck
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Book Description
The theory of absorption techniques, including line broadening and shifts, along with a brief description of the spectroscopy of the seed species Rb, will be given. A brief overview of the diode laser itself and the experimental setup for the technique follow. Results are split into two parts: preparatory and calibration work in a test cell and a small test shock tube, followed by results in HEG, are presented. Here time profiles for gas temperature T(trans) and velocity u are given for various HEG run conditions.
Author: Frank K. Lu
Publisher: AIAA
ISBN: 9781600864483
Category : Aerodynamics, Hypersonic
Languages : en
Pages : 694
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Author: W. H. Beck
Publisher:
ISBN:
Category :
Languages : en
Pages : 26
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Book Description
Use of LIF in two line thermometry TLT and of flash lamp absorption to examine high enthalpy flows is presented. The aim is to measure rotational and vibrational temperatures of nitric oxide NO in high temperature air in the Goettingen High Enthalpy Shock Tunnel HEG. Theory of NO (energy levels, spectroscopy, level populations), LIF and TLT are discussed. Results are given from a test cell to validate TLT with NO LIF as a quantitative technique. HEG results for rotational and vibrational temperatures in the free stream and around models are presented. Finally, flash lamp absorption results yielding these temperatures are given.
Author: W. H. Beck
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1044
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Arnold Engineering Development Center (AEDC) and the German Aerospace Institute (DLR) have conducted a cooperative program on operation and test technique development for high enthalpy shock tunnels. The AEDC Free-Piston Shock Tunnel (FPST) and the DLR High Enthalpy Gottingen (HEG) facility were used for complementary test programs. The two organizations individually and jointly analyzed data from these tests to assess and advance the state of their computational fluid dynamics capabilities. Several nonintrusive diagnostic techniques were employed at each facility resulting in new and improved diagnostic capabilities for each partner. This report explains the organization of the joint program reviews the operation of free-piston shock tunnels and presents the results of data acquisition and analysis from the test programs.
Author: Alain Boutier
Publisher: John Wiley & Sons
ISBN: 1118576950
Category : Science
Languages : en
Pages : 263
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Book Description
In fluid mechanics, non-intrusive measurements are fundamental in order to improve knowledge of the behavior and main physical phenomena of flows in order to further validate codes. The principles and characteristics of the different techniques available in laser metrology are described in detail in this book. Velocity, temperature and concentration measurements by spectroscopic techniques based on light scattered by molecules are achieved by different techniques: laser-induced fluorescence, coherent anti-Stokes Raman scattering using lasers and parametric sources, and absorption spectroscopy by tunable laser diodes, which are generally better suited for high velocity flows. The size determination of particles by optical means, a technique mainly applied in two-phase flows, is the subject of another chapter, along with a description of the principles of light scattering. For each technique the basic principles are given, as well as optical devices and data processing. A final chapter reminds the reader of the main safety precautions to be taken when using powerful lasers.
Author: Anthony A. Boiarski
Publisher:
ISBN:
Category : Gas dynamics
Languages : en
Pages : 100
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Book Description
The laser Raman scattering technique shows potential as a diagnostic method for determining the chemical and thermodynamic state of high-temperature gases. To investigate the utility of this technique for shock-tube diagnostics, and to validate the method at known elevated temperatures, vibrational Raman intensities were measured behind an incident shock wave. Intensity history data through the wave front, vibrational excitation times of oxygen in air, along with temperature and density measurements for oxygen and nitrogen in air were obtained over a range of postshock conditions. The measured densities and temperatures were found to be in good agreement with shock-wave theory. An excitation time measurement also agreed well with shock-tube data obtained with other diagnostic methods. In general, the results indicated that the Raman scattering technique was accurate at elevated temperatures and should prove useful in determining the thermochemical state of gases in continuous flows as well as in shock tubes and other impulse facilities.
Author: American Institute of Aeronautics and Astronautics. Technical Information Service
Publisher:
ISBN:
Category : AIAA paper
Languages : en
Pages : 184
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 836
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