Author(s): Moonhyung Park; Young-Uk Ryu; Hyung Suk Kim; Jong-Seok Lee
Linked Author(s):
Keywords: Dissipator; Hydraulic jump; Weir; Flow; Turbulence; PIV
Abstract: This study presents a result of a PIV (Particle Image Velocimetry) laboratory experiment of the flow and turbulence characteristics downstream of a weir. Mean velocities and turbulence quantities are obtained by averaging instantaneous velocities. Various flow conditions are considered by controlling the tailwater depth (h). As the tailwater depth is fairly low, the hydraulic jump occurs with an oscillating jet which produces waves of non-periodicity, and high turbulence fluctuations are observed around the jet flow. In such case, only flow fields of the internal flow in the hydraulic jump are measured due to the limitation of PIV techniques. When the tailwater depth increases, the jump is forced upstream and then becomes a submerged jump. The high flow occurs along an apron and the stagnation zone of recirculating flow is observed outside the submerged jet. In addition, effect of concave dissipator in the apron is described.
Year: 2016