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The turbulent concentration field of a methane jet

Published online by Cambridge University Press:  19 April 2006

A. D. Birch ,
D. R. Brown ,
M. G. Dodson  and
J. R. Thomas
A. D. Birch
Affiliation:
British Gas Corporation, Research and Development Division, Midlands Research Station, Wharf Lane, Solihull, West Midlands, England B91 2JW
D. R. Brown
Affiliation:
British Gas Corporation, Research and Development Division, Midlands Research Station, Wharf Lane, Solihull, West Midlands, England B91 2JW
M. G. Dodson
Affiliation:
British Gas Corporation, Research and Development Division, Midlands Research Station, Wharf Lane, Solihull, West Midlands, England B91 2JW
J. R. Thomas
Affiliation:
British Gas Corporation, Research and Development Division, Midlands Research Station, Wharf Lane, Solihull, West Midlands, England B91 2JW
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Abstract

Detailed measurements of turbulent concentration parameters in a round free methane jet up to 70 diameters downstream from the jet source are described. The concentration changes were obtained using a Raman spectrometer designed for the measurement of a methane vibrational transition function, and processed using a photon correlator. Mean and fluctuating concentration levels are given, together with the concentration probability density distribution.

A theory for interpreting the statistical aspects of the signal is presented and results are compared with other data from the literature on jets of uniform and non-uniform density. It is shown that the intensity of concentration fluctuations has an asymptotic value of 28·5% in the far field region of the jet. One interesting feature of the data is the deviation from Gaussian statistics along the jet centre-line.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 88 , Issue 3 , 13 October 1978 , pp. 431 - 449
Copyright
© 1978 Cambridge University Press

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