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Turbulence intensity in the vortex settling tank

Krukowski Marcin, Rusjan Anna, Kiczko Adam, Siwicki Piotr, Kozioł Adam

Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej

2024

Nr 90 (tom 1)

131--144

Experimental research was undertaken to investigate changes in flow velocity and turbulence intensity in a vortex settling tank as a result of increasing flow rate. Two studies were conducted for two different flow rates through the settling tank. The changes in the flow turbulence structure were analysed at two depths of the settling tank based on the measured instantaneous flow velocities. The instantaneous velocities were measured using a three-component acoustic Doppler velocity meter. Changes in values and distributions of velocity and turbulence intensity in the vortex settling tank were presented. It was observed that a twofold increase in flow caused an up to a threefold increase in the average flow velocity near the settling tank walls, a twofold increase in the turbulence intensity near the settling tank walls, and an increase in zones of local turbulence. In these zones, the increase in the gradient of turbulence intensity values is much greater than in the others. The zone of turbulence with maximum values occurs on the left side of the settling tank near the outlet deflector. The presented changes in the turbulence structure negatively affect the efficiency of the settling tank by increasing the values of velocity and turbulence intensity.