Experimental study of double‑cavity fow

FLORIAN TUERKE; LUC PASTUR; DENISSE SCIAMARELLA; F LUSSEYRAN; GUILLERMO ARTANA

EXPERIMENTS IN FLUIDS

SPRINGER

Lugar: Berlin; Año: 2017 vol. 58 p. 1 - 15

0723-4864

The fow through two facing, identical cavities(double-cavity) is characterized experimentally, as theinfow velocity and the distance between the cavities isvaried. Standard 2D2C particle image velocimetry measurementsin the spanwise mid-plane provide informationon the instantaneous and mean velocity fow felds. LaserDoppler velocimetry measurements at several points in thedouble-cavity domain reveal the global character of thestreamwise fuctuating velocity spectra. The fow is characterizedbased on time series, recorded in the shear layer ofone of the cavities, for a wide range of infow velocities andintercavity distances. In a detailed spectral study, we showhow the shear layer spectra get affected when the two cavitiesare brought closer together. Based on the experimentaldata, a temporal local linear stability analysis was carriedout, which was able to explain why the frequency peaksfor close intercavity distances broaden and move to higherStrouhal numbers.