Abstract
The evolution of the normal aerodynamic coefficient of 19 configurations of square plates with various porosity patterns, ranging from solid
plate to homogeneous porous plate, is experimentally characterized. The variation of the porosity pattern is obtained by partially covering the
holes of a commercial fly-swatter using adhesive tape. Evolution of the normal aerodynamic coefficient is assessed from the measurement of
the angular position of the porous plate, placed as a freely rotating pendulum swept by a flow in a wind tunnel. These angular measurements
are also supported by particle image velocimetry (PIV) measurements of the structure of the wake. We show that the porosity pattern determines whether or not an abrupt stall occurs. In particular, the details of the porosity pattern on the edges of the plate are decisive for the existence of abrupt stall.
plate to homogeneous porous plate, is experimentally characterized. The variation of the porosity pattern is obtained by partially covering the
holes of a commercial fly-swatter using adhesive tape. Evolution of the normal aerodynamic coefficient is assessed from the measurement of
the angular position of the porous plate, placed as a freely rotating pendulum swept by a flow in a wind tunnel. These angular measurements
are also supported by particle image velocimetry (PIV) measurements of the structure of the wake. We show that the porosity pattern determines whether or not an abrupt stall occurs. In particular, the details of the porosity pattern on the edges of the plate are decisive for the existence of abrupt stall.
| Original language | English |
|---|---|
| Article number | 017105 |
| Number of pages | 11 |
| Journal | Physics of Fluids |
| Volume | 36 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 8-Jan-2024 |