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Measurements in a subsonic turbulent jet using a quantitative schlieren technique

Published online by Cambridge University Press:  29 March 2006

M. R. Davis
M. R. Davis
Affiliation:
School of Mechanical and Industrial Engineering, The University of New South Wales
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Abstract

The development of optical methods for the quantitative study of the fluctuating properties of turbulent flows can provide a supplement to conventional hot-body anemometry techniques. In particular, the study of high-speed flows by hot-wire or hot-film anemometry is often difficult owing to the presence of temperature and velocity fluctuations in the flow, thereby complicating the correct interpretation of measured signals. In addition, restrictions are placed on the application of such anemometers by their physical strength, frequency-response characteristics and the introduction of disturbances by the measuring probes into the flow.

The operation of an optical detection system depends primarily on the mechanism by which the detected radiation intensity is modulated by the flow. Methods which have been used successfully include scattering or absorption of incident light by tracer constituents or particles, the absorption or emission of infra-red radiation by the flow and quantitative adaptations of the schlieren and interferometer systems which are sensitive to the flow density structure. All these systems detect a summation of signals from different parts of the flow and in consequence it is necessary to consider in detail the relation of the integrated signal to the local properties of the flow. This paper deals in particular with the application of the schlieren principle to an axisymmetric turbulent jet.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 46 , Issue 4 , 27 April 1971 , pp. 631 - 656
Copyright
© 1971 Cambridge University Press

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References

Becker, H. A., Hottel, H. C. & Williams, G. C. 1967 On the light scatter technique for the study of turbulence and mixing J. Fluid Mech. 30, 259–284.Google Scholar
Bradshaw, P. 1966 The effect of initial conditions on the development of a free shear layer Fluid Mech. 26, 225–236.Google Scholar
Bradshaw, P., Ferriss, D. H. & Johnson, R. E. 1964 Turbulence in the noise-producing region of a circular jet J. Fluid Mech. 19, 591–624.Google Scholar
Davies, P. O. A. L. 1966 Turbulence structure in free shear layers. A.I.A.A. J. 4, 1971–1975.Google Scholar
Davies, P. O. A. L., Fisher, M. J. & Barratt, M. J. 1963 The characteristics of the turbulence in the mixing region of a round turbulent jet J. Fluid Mech. 15, 337–367.Google Scholar
Fisher, M. J. & Davies, P. O. A. L. 1964 Correlation measurements in a non-frozen pattern of turbulence J. Fluid Mech. 18, 97–116.Google Scholar
Fisher, M. J. & Krause, F. R. 1967 The crossed beam correlation technique J. Fluid Mech. 28, 705–717.Google Scholar
Gyarmathy, G. 1969 Optical measurements of mass density in a high speed, confined, gaseous vortex. A.I.A.A. J. 7, 1838–1845.Google Scholar
Hinze, J. O. 1959 Turbulence. New York: McGraw-Hill.
Jones, I. S. F. 1969 Fluctuating turbulent stresses in the noise producing region of a jet J. Fluid Mech. 36, 529–544.Google Scholar
Kingslake, R. 1967 Applied optics and optical engineering, vol. iv. New York: Academic.
Lighthill, M. J. 1952 On sound generated aerodynamically. I. General theory. Proc. Roy. Soc A 211, 564–587.Google Scholar
Lighthill, M. J. 1954 On sound generated aerodynamically. II. Turbulence as a source of sound. Proc. Roy. Soc A 222, 1–33.Google Scholar
Ribner, H. S. 1969 Quadrupole correlations governing the pattern of jet noise J. Fluid Mech. 38, 1–24.Google Scholar
Sanders, J. V. 1967 A Schlieren system for acoustic measurements. 74th Meeting of the Acoustical Society of America, Miami, Florida.
Sutton, G. W. 1969 Effect of turbulent fluctuations in an optically active fluid medium A.I.A.A. 7, 1737–1743.Google Scholar
Thompson, J. P. 1967 The derivation of power spectra of density variations in hypersonic wakes from Schlieren photographs. R.A.E. Tech. Report 67226.
Thompson, L. L. & Taylor, L. S. 1969 Analysis of turbulence by Schlieren photography A.I.A.A. J. 7, 2030–2031.Google Scholar
Weinberg, F. J. 1963 Optics of flames. London: Butterworth.