Effects of discharge angles on hydrodynamics and dilution of round jets in wave environment

An experimental study was carried out on the round jet flow at different inclination angles in wave environment by using particle image velocity measurement and plane laser induced fluorescence techniques, comparing and analyzing the impact of discharge angles on instantaneous flow pattern, mean velocity field and mean concentration field of jet flow. The experimental result shows that changes in discharge angle have significant impacts on flow pattern, velocity distribution and mixing range of jet flow in wave environment. When the jet flow moves in the wave direction, the velocity profile of jet dominant region presents bimodal distribution, and the mixing range increases with the increase of discharge angle and then decreases when initial concentrations of 20%, 30%, 40% and 50% are reached. When the jet flow moves in the reverse wave direction, the jet flow velocity profile presents bimodal distribution which is not obvious, and the corresponding mixing range decreases with the increase of discharge angle. Under the combined action of wave traction and jet flow entrainment, the dilution effect of reverse jet flow is generally better than forward jet flow at the same angle between vertical line.