<p>The Three-way vortex shedding phenomenon is the main excitation source for pipe vibration, which can lead to generation of acoustic resonance. The existing researches mainly focus on air and steam. However, the research on water is rare. In this paper, the vortex shedding phenomenon under the water medium of the three-way closed branch pipe is studied. A three-way closed branch pipe test device is established to verify the mechanism. The PIV measurement method is used to obtain the change characteristics of the flow line and velocity distribution of the closed branch pipe under different working conditions. Tests have shown that due to the special structure of the three-way closed branch pipe, pressure waves are formed at the location of the three-way, and vortices are formed in the branch pipe; a large velocity gradient will be generated when the fluid flows through the junction area of the main pipe and the branch pipe. The small vortex clusters that continuously fall off are formed at the front edge of branch pipe that; due to the fluid viscosity, the fluid at the front edge of the branch pipe will be driven downstream by the mainstream area, creating a vacuum area at the front edge; at the interface between the main pipe and the branch pipe, the velocity fluctuation of the vortex increases with the increase of the flow velocity, the size of the vortex cluster in the branch pipe increases with the increase of the velocity, and the vortex shedding speed at the front edge of the branch pipe increases with the increase of the velocity.</p>

Experiment on Vortex Shedding in Water Medium of Three-Way Closed Branch Pipe

Paper Proceedings: https://asmedigitalcollection.asme.org/ICONE/ICONE28/volume/85246

2021 28th International Conference on Nuclear Engineering (ICONE28)

Supporting the need among researchers worldwide for additional online and multimedia content, ASME now offers the ASME Conference Video Collection. This platform will collect and provide long-term access to conference presentation videos, encompassing all technology areas within ASME's technical conference and events program. About 30,000-40,000 engineers across all mechanical engineering and related disciplines participate in ASME conferences each year. This includes authors of approximately 6,000 to 8,000 technical papers published by ASME, the majority of whom also submit video presentations for our virtual conferences. The video collection will be available as an add-on to existing product packages or as a separate subscription.