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A Possible Method for Obtaining High Mach Numbers using Compressed Air Supplies of Relative Low Pressures

Published online by Cambridge University Press:  28 July 2016

F. Van Der Walle
F. Van Der Walle*
Affiliation:
Technological University, Delft
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Extract

A method for obtaining high Mach numbers using compressed air of low pressures is described. The proposed system can be used to extend the working range of existing direct blow-down and induction facilities.

An investigation has been made to see whether a supply of compressed air of about 5 atmospheres could be used to achieve Mach numbers between 1.4 and 4.0.

The commonly used types of intermittent supersonic wind tunnels driven by compressed air are

  1. (a) Direct blow-down tunnels.

  2. (b) Induction tunnels.

At high Mach numbers the induction tunnel is known to be very inefficient while the direct blow-down tunnel requires high stagnation pressures.

Type
Technical Notes
Information
The Aeronautical Journal , Volume 58 , Issue 523 , July 1954 , pp. 510 - 512
Copyright
Copyright © Royal Aeronautical Society 1954

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References

1. Lilley, G. M. and Holder, D. W.. Experiments on an Induction Type High Speed Wind Tunnel Driven by Low Pressure Steam. College of Aeronautics, Cranfield, Report No. 23.Google Scholar
2. Irving, F. G. (1953). A Note on the Theory of the Constant Area-Mixing of Compressible Flows as Applied to High Speed Wind Tunnel Design. The Aeronautical Quarterly, Vol. IV, February 1953Google Scholar