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Measurement of drag using a momentum balance

  • L. C. Squire (a1)

Summary

This note presents the results of the application of a momentum control surface analysis to the estimation of the drag of bodies and surfaces placed in the test section of a windtunnel. The assumptions of the method are stated and accuracy of the method considered with particular reference to the drag of riblet surfaces at high subsonic speeds, the drag of two-dimensional cavities at both high subsonic and low supersonic speeds, and the drag of manipulators at high subsonic speeds.

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1. Jeromin, L.O.F. An experimental investigation of the compressible turbulent boundary layer with air injection, ARC R&M 3526, 1966.
2. Squire, L.C. Further experimental investigations of compressible turbulent boundary layers with air injection, ARC R&M 3627, 1970.
3. Squire, L.C. and Savill, A.M. Drag measurements on planar riblet surfaces at high subsonic speeds. Applied Scientific Research, 1989, 46, pp 229243.
4. Squire, L.C. and Nasser, S.H. Cavity drag at transonic speeds. Aeronaut J, 1993, 97, (967), pp 247256.
5. Winter, K.G. and Gaudet, L. Turbulent boundary layer studies at high Reynolds numbers between Mach number of 0·2 and 2·8, ARC R&M 3712, 1970.
6. Green, I.E., Weeks, D.J. and Brooman, J.W.F. Prediction of turbulent boundary layers and wakes in compressible flow by a lag-entrainment method. ARC R&M 3791, 1973.
7. Squire, L.C. and Savill, A.M. Experimental results on aerofoil manipulators at high subsonic speeds. Paper in preparation.

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Measurement of drag using a momentum balance

  • L. C. Squire (a1)

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