Transient Grating Spectroscopy in a Hot Turbulent Compressible Free Jet

Transient Grating Spectroscopy in a Hot Turbulent Compressible Free Jet

Speed of sound profiles of an unseeded hot, supersonic, axisymmetric free air jet at atmospheric pressure are measured with 2% uncertainty using laser-induced electrostrictive gratings. Signal level and lifetime decay with increasing temperature, and no data are obtained for static temperatures abov...

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Veröffentlicht in:Journal of propulsion and power 2005-11, Vol.21 (6), p.1008-1018
Hauptverfasser: Schlamp, S, Rosgen, T, Kozlov, D. N, Rakut, C, Kasal, P, von Wolfersdorf, J
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Compressibility
Free jets
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container_end_page 1018
container_issue 6
container_start_page 1008
container_title Journal of propulsion and power
container_volume 21
creator Schlamp, S
Rosgen, T
Kozlov, D. N
Rakut, C
Kasal, P
von Wolfersdorf, J
description Speed of sound profiles of an unseeded hot, supersonic, axisymmetric free air jet at atmospheric pressure are measured with 2% uncertainty using laser-induced electrostrictive gratings. Signal level and lifetime decay with increasing temperature, and no data are obtained for static temperatures above 540 K. The influence of temperature, turbulence, beam steering, and mechanical vibrations on the signal amplitude and lifetime is examined quantitatively. It is argued that electrostrictive gratings are applicable for thermometry and velocimetry in supersonic combustors by employing a powerful pulsed infrared probe beam. The significantly larger beam power raises the signal level by three orders of magnitude, whereas the longer wavelength reduces the effects of beam steering by increasing the angular separation between probe and signal beam.
doi_str_mv 10.2514/1.13794
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source Alma/SFX Local Collection
subjects Compressibility
Free jets
title Transient Grating Spectroscopy in a Hot Turbulent Compressible Free Jet
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