Hostname: page-component-586b7cd67f-rdxmf Total loading time: 0 Render date: 2024-11-28T14:26:14.788Z Has data issue: false hasContentIssue false
  • English
  • Français

An Unsteady Flow Wind Tunnel

Published online by Cambridge University Press:  07 June 2016

J H Horlock
J H Horlock*
Affiliation:
Salford University, formerly SRC Turbomachinery Laboratory, Cambridge
Get access

Summary

A novel low-speed wind tunnel which produces unsteady “gust” flows is described. The walls are sinusoidal in shape and are moved in the flow direction with a velocity Ww less than the mean velocity Wm of the free stream. The tunnel is useful for testing isolated aerofoils and aerofoils in cascade in non-convective gusts (Ww < Wm) so that comparisons with predictions by thin aerofoil theory may be made. However, it does not simulate precisely the unsteady flow that occurs in axial flow turbomachines.

Type
Research Article
Information
Aeronautical Quarterly , Volume 25 , Issue 2 , May 1974 , pp. 81 - 90
Copyright
Copyright © Royal Aeronautical Society. 1974

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1 von Kármán, Th, Sears, W R, Aerofoil theory for non-uniform motion. Journal of the Aeronautical Sciences, Vol 5, No 10, pp 379-390, 1938.Google Scholar
2 Sears, W R, Some aspects of non-stationary airfoil theory. Journal of the Aeronautical Sciences, Vol 8, No 3, pp 104-108, 1941.CrossRefGoogle Scholar
3 Kemp, N H, On the lift and circulation of airfoils in some unsteady flow problems. Journal of the Aeronautical Sciences, Vol 19, No 3, pp 713-714, 1952.Google Scholar
4 Horlock, J H, Fluctuating lift forces in aerofoils moving through transverse and chordwise gusts. ASME Transactions, Journal of Basic Engineering, Vol 90D, No 4, pp 494-500, 1968.Google Scholar
5 Keuthe, A M, Sears, W R, The growth of the circulation on an aerofoil flying through a gust. Journal of the Aeronautical Sciences, Vol 6, pp 376-378, 1939.Google Scholar
6 Carta, F O, Commerford, G L, An exploratory investigation of the unsteady aerodynamic response of a two-dimensional airfoil at high reduced frequency. United Aircraft Research Laboratory Report UAR J-182, 1970.Google Scholar
7 Holmes, D W, Lift and pressure measurements on an aerofoil in unsteady flow. 18th ASME International Gas Turbine Conference, Washington, D C, Preprint No 73-GT-41, 1973.Google Scholar
8 Satyanarayana, B, Gostelow, J P, Henderson, R E, A comparison between experimental and theoretical fluctuating lift on cascades at low frequency parameters. 19th ASME International Gas Turbine Conference, Zurich, Preprint No 74-GT-78, 1974.Google Scholar
9 Liepmann, H W, Puckett, A E, Introduction to Aerodynamics of a Compressible Fluid. Wiley, New York, 1947.Google Scholar
10 Horlock, J H, Daneshyar, H, Stagnation pressure changes in unsteady flow. Aeronautical Quarterly, Vol XXII, pp 207-224, 1971.Google Scholar
11 Horlock, J H, Unsteady flow in turbomachines. Proceedings of Third Australasian Conference on Hydraulics and Fluid Mechanics, Institution of Engineers (Australia), pp 221-227, 1968.Google Scholar
12 Kemp, N H, Sears, W R, Aerodynamic interference between moving blade rows. Journal of the Aeronautical Sciences, Vol 20, No 9, pp 585-598, 1953.Google Scholar