DEFINITION OF THE PARAMETERS OF SURFACE UNDULATIONS FOR SMALL SCALE AIRCRAFT WING

Read more This work is devoted to investigation of flow parameters on classic and wavy wing with Z-15-25 profile in area of Reynolds number from 0,35 to 2x105 with α = 0ᶛ. The oil-film visualization are demonstrate the transformation of separation area on low Reynolds wing surfaces. Influence of distribution of a pressure gradient on a profile upon the sizes of separation area is shown and limits of applicability of a wavy surface of a wing are defined. The thermoanemometric data provided to determine boundary layer thickness and pulsation characteristics. As shown that at Reynolds number area 0,6–2x105 the mechanisms of flow instability and laminar-turbulent transition are invariable and depend from local boundary layer parameters at preseparation area. As well as for a classical wing, in the area of a groove of a wavy wing, the central frequency of a package of waves of instability of a shift layer can be well foretold both by means of the linear theory of stability, and by means of a hypothesis that the wavelength of the running indignations is proportional to the doubled boundary layer thickness. At result the technique of a finding of parameters of a undulations of a wing for any profile in the range of numbers of Reynolds from 104 до 105 is offered.

Keywords:
low Reynolds number, wavy wing, boundary layer, separation bubble, laminarturbulent transition, oil-film visualization, undulations parameters.  
УДК 533.69; 533.6.001.32

DEFINITION OF THE PARAMETERS OF SURFACE UNDULATIONS FOR SMALL SCALE AIRCRAFT WING