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A Note on the Theory of the Constant-Area Mixing of Compressible Flows as Applied to High-Speed Wind Tunnel Design

Published online by Cambridge University Press:  07 June 2016

F. G. Irving
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Summary

The one-dimensional equations governing the mixing of compressible flows in a channel of constant cross-sectional area are derived and are used to investigate the running of an induction-type high-speed wind tunnel. While in practice it is usually difficult to achieve working section Mach numbers greater than about 1.8 to 20 in this type of tunnel, this simple theory gives no obvious reason for this and indicates that higher Mach numbers should be attainable.

It is also shown that an increase in efficiency is predicted, particularly at the higher supersonic Mach numbers, if the injected stream enters the mixing section at the same Mach number as that of the working section main stream.

Type
Research Article
Information
Aeronautical Quarterly , Volume 4 , Issue 2 , August 1953 , pp. 164 - 178
Copyright
Copyright © Royal Aeronautical Society. 1953

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References

1. Keenan, J. H., Newmann, E. P. and Lustwerk, F. (1950). An Investigation of Ejector Design by Analysis and Experiment. Journal of Applied Mechanics, pp. 299–309, Sept. 1950.Google Scholar
2. Lilley, G. M. and Holder, D. W. (1949). Experiments on an Induction Type High Speed Wind Tunnel Driven by Low Pressure Steam. College of Aeronautics Report, No. 24, March 1949.Google Scholar
3. Holder, D. W. (1946). An Estimation of the Running Time of an Induction Type High Speed Wind Tunnel Driven from Compressed Air Storage. A.R.C. 9902.Google Scholar
4. Holder, D. W., and North, R. J. The 9 in. x 3 in. N.P.L. Induced Flow High Speed Wind Tunnel. A.R.C. 12387.Google Scholar