The turbulent concentration field of a methane jet
- 13 October 1978
- journal article
- research article
- Published by Cambridge University Press (CUP) in Journal of Fluid Mechanics
- Vol. 88 (3), 431-449
- https://doi.org/10.1017/s0022112078002190
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.Keywords
This publication has 21 references indexed in Scilit:
- Laser light-scattering measurements of particle concentration in a turbulent jetJournal of Fluid Mechanics, 1977
- Conditionally sampled measurements in a heated turbulent jetJournal of Fluid Mechanics, 1975
- The determination of gaseous turbulent concentration fluctuations using Raman photon correlation spectroscopyJournal of Physics D: Applied Physics, 1975
- The Use in Probabilistic Design of Probability Curves Generated by Maximizing the Shannon Entropy Function Constrained by MomentsJournal of Engineering for Industry, 1975
- Statistical characteristics of a turbulent jetJournal of Fluid Mechanics, 1975
- Photon correlation spectroscopy and its application to the measurement of turbulence parameters in fluid flowsJournal of Physics D: Applied Physics, 1975
- Determination of intensity correlation functions from photoelectric counting distributionsIEEE Journal of Quantum Electronics, 1970
- The nozzle-fluid concentration field of the round, turbulent, free jetJournal of Fluid Mechanics, 1967
- Analysis of Light Fluctuations from Photon Counting Statistics*Journal of the Optical Society of America, 1967
- Fluctuations of Photon Beams: The Distribution of the Photo-ElectronsProceedings of the Physical Society, 1959