Interferometrical Setup For The Study Of Thermic Turbulence In A Plane Airstream

Alain Gagnaire; Albert Tailland

doi:10.1117/12.956141

18 April 1978 Interferometrical Setup For The Study Of Thermic Turbulence In A Plane Airstream

Alain Gagnaire, Albert Tailland

Proceedings Volume 0136, 1st European Conf on Optics Applied to Metrology; (1978) https://doi.org/10.1117/12.956141
Event: First European Conference on Optics Applied to Metrology, 1977, Strasbourg, France

Abstract

The difficulties of investigating thermal turbulence using a classical hot wire anemometer in flows with very high mean velocity and temperature are well known. We are thus concerned in this paper with the possibility of studying such a turbulence by means of a laser beam propagating through a heated free plane jet of air. The beam undergoes in the flow random perturbations which tend to deflect it around the path that it would have taken if it had propagated in a vacuum. A formula is derived which relates the random deflection to the random temperature fluctuations. The experimental set-up is described. The values of the mean temperature and velocity have been chosen so that comparisons between the results obtained by this optical method and thoses obtained by the classical hot wire are made possible. A close agreement between both sets of results proves the validity of the model.

Citation Download Citation

Alain Gagnaire and Albert Tailland "Interferometrical Setup For The Study Of Thermic Turbulence In A Plane Airstream", Proc. SPIE 0136, 1st European Conf on Optics Applied to Metrology, (18 April 1978); https://doi.org/10.1117/12.956141

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