An acoustic Doppler velocimeter (ADV-FlowTracker 2) was used to measure the velocity field in three different positions in the Biffis channel. The channel is a regulated compound concrete channel continuously diverting 130-135 m3/s from the Adige River (Italy) for irrigation. Three different experiments were conducted with three different hydraulic conditions (turbines in production or off). The measurement positions were chosen close to the channel bank. This campaign aimed to evaluate the influence of the of propellers turbines (prototypes) on the free surface channel flow, the velocity fluctuations and to identify presence of coherent structures. The results showed that the velocity fluctuations related to the channel geometry are present in all measurements regardless of the active turbines. However, the turbulent kinetic energy, the length and the number of the turbulent events are larger for the cases when the turbines were in production. The turbulent events are shorter for the case in which both turbine-arrays worked.
Flow field investigation by means of ADCP for the evaluation of hydropower propellers installed at open channel
Cavalieri I.;Schippa L.
2022
Abstract
An acoustic Doppler velocimeter (ADV-FlowTracker 2) was used to measure the velocity field in three different positions in the Biffis channel. The channel is a regulated compound concrete channel continuously diverting 130-135 m3/s from the Adige River (Italy) for irrigation. Three different experiments were conducted with three different hydraulic conditions (turbines in production or off). The measurement positions were chosen close to the channel bank. This campaign aimed to evaluate the influence of the of propellers turbines (prototypes) on the free surface channel flow, the velocity fluctuations and to identify presence of coherent structures. The results showed that the velocity fluctuations related to the channel geometry are present in all measurements regardless of the active turbines. However, the turbulent kinetic energy, the length and the number of the turbulent events are larger for the cases when the turbines were in production. The turbulent events are shorter for the case in which both turbine-arrays worked.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
