Browsing by Author "Milne, R. D."
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Item Open Access Measurement of the derivative zw for oscillating wings in cascade(College of Aeronautics, Cranfield., 1955-07) Milne, R. D.Experimental results are reported of the damping derivative zw. for rigid rectangular wings of various aspect ratios in cascades having gap-chord ratios of 2, 1,1/2, 1/3, 1/4. The results show fair agreement with two-dimensional theory. The ranges of Reynolds numbers and frequency parameters were 0.8 to 2.5 x 10) and 0.1 to 0.45 respectively. The results show a strong dependence on Reynolds number which increases with decrease in gap-chord ratio. This effect was eliminated by transition fixation by wires placed at suitable positions down-stream of the wing leading edge.Item Open Access The unsteady aerodynamic forces on deforming, low aspect ratio wings and slender wing-body combinations oscillating harmonically in a compressible flow(College of Aeronautics, Cranfield., 1955-07) Milne, R. D.A method is presented whereby the 'Slender Body Theory' can be applied to the determination of the unsteady aerodynamic forces acting on slender wings and wing-body combinations experiencing harmonic deformations in a compressible flow. The analysis holds for subsonic and supersonic speeds, subject to restrictions which are stated and discussed.