Observations of the flow round a two-dimensional aerofoil oscillating in a high-speed air stream

Show simple item record

dc.contributor.author A. Chinneck en_US
dc.contributor.author D. W. Holder en_US
dc.contributor.author C. J. Berry en_US
dc.date.accessioned 2014-10-21T15:53:36Z
dc.date.available 2014-10-21T15:53:36Z
dc.date.issued 1952 en_US
dc.identifier.other ARC/R&M-2931 en_US
dc.identifier.uri https://reports.aerade.cranfield.ac.uk/handle/1826.2/3494
dc.description.abstract Photographs have been taken of the flow round a 10 per cent thick RAE 104 aerofoil performing pitching oscillations at low values of the frequency parameter (ω < 0.1) in subsonic and supersonic air streams. Apart from a difference of phase, the general flow patterns appeared to be similar to those observed in steady motion, the pattern for a particular instantaneous incidence of the oscillation resembling that for steady motion at a different incidence. It is suggested that, for the range of frequency parameter covered, the observed phase lag of the flow pattern corresponds to the lag in the circulation. The phase lag of the flow pattern (as indicated in most cases by the positions of the regions where transition from laminar to turbulent flow occurs in the boundary layer) has been determined for various conditions of frequency, amplitude and Mach number, and for two positions of the axis of oscillation. For one axis position direct measurements of the pitching-moment derivatives had been made previously, and the phase lag of the flow pattern found in the present experiment is approximately the same as that in the pitching moment. At the supersonic speed (M = 1.6) used in the present tests any phase difference that was present was too small to be detected in a photograph. en_US
dc.relation.ispartofseries Aeronautical Research Council Reports & Memoranda en_US
dc.title Observations of the flow round a two-dimensional aerofoil oscillating in a high-speed air stream en_US

Files in this item

This item appears in the following Collection(s)

Show simple item record



My Account