Investigation on the Cavity Backwater of the Jet Flow from the Chute Aerators

In order to protect discharge works against cavitation erosion, the air concentration in the flow needs to reach some extent, which demands the jet flow from an aerator to form a good flow pattern with an enough cavity space for aeration. Based on the hydrodynamic analysis and the momentum equation of the jet flow from an aerator, the equation for the backwater depth in the cavity of jet flow from the chute aerators has been theoretically established. Together with the trajectory equation of jet flow, the backwater depth in the flow cavity of aerators can be calculated. Also the reason for the appearance of the backwater is analyzed. Comparison shows that the calculation results agree well with the observed experimental data.