M. Fischer et al., COMBINED PARTICLE IMAGE VELOCIMETRY AND VISUALIZATION EXPERIMENTS ON INSTABILITIES IN A FLAT-PLATE BOUNDARY-LAYER WITH ZERO PRESSURE-GRADIENT, Optical engineering, 33(4), 1994, pp. 1343-1348
Quantitative and visual data of artificially forced instabilities are
acquired in a flat plate boundary layer in air. For the first time, pa
rticle image velocimetry (PIV) allows the instantaneous recording of a
complete velocity field. With this technique, quantitative data are o
btained within the boundary layer and very close to the wall. By using
a light sheet technique it is possible furthermore to obtain visual d
ata. Reproducible and constant conditions in the development of the in
stabilities are achieved by forcing the boundary layer with well-contr
olled disturbances. These disturbances are generated with an arrangeme
nt for acoustic excitation.