EXPERIENCE OF THE USING OF CASCADE METHOD FOR TURBULENT BOUNDARY-LAYER CONTROL THROUGH AIR BLOWING

The possibilities of turbulent drag reduction in an incompressible turbulent boundary layer of a flat plate with air blowing through a microperforated surface which consists of sequentially arranged one behind the other self-contained permeable areas were studied. Mass flow rate of air blowing per unit area Q was increased with increasing distance downstream, but in total was not more than 0.0768 kg/s/m² . A consistent reduction of the local skin friction values along the length of the model, up to 70% at the end of the last active blowing area was shown. The experimental data characterizing the ability to manage a turbulent boundary layer in the ground conditions by passive air overflow generated by the difference between the barometric pressure and the pressure in the wind tunnel test section were obtained.

Keywords:
turbulent boundary layer, the cascade control method, plate, microperforated surface, blowing, skin friction.
УДК 532.526.4 + 532.546.6 + 532.526.72

EXPERIENCE OF THE USING OF CASCADE METHOD FOR TURBULENT BOUNDARY-LAYER CONTROL THROUGH AIR BLOWING