Author(s): L. Chatellier; R. -W. Wang; L. David; D. Courret; M. Larinier
Linked Author(s):
Keywords: Trashrack; Fish-friendly; Intake; Pressure loss; Towing tank; Particle Image Velocimetry
Abstract: An experimental study of open channels flows across conventional and fish-friendly trashrack models in a towing tank is reported. Experiments are conducted for two kinds of trashracks, respectively comprised of fixed-width rectangular and profiled bars. Various trashrack orientation angles, bar-to-bar spacings and incoming flow velocities are investigated, while detailed Particle Image Velocimetry measurements are carried-out upstream and downstream of the trashracks in the streamwise-spanwise plane, along with pressure recordings. A stitching technique applied to the quasi time-resolved PIV snapshots allows a precise reconstruction of the flows, leading to the investigation of extended datasets. The flow analysis reveals significant effects of the various trashrack configurations on the topology of the flow, with a strong influence on the mixing layer and on the extent of the downstream recirculation region.
Year: 2011