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Open AccessArticle

Numerical Investigation of Vertical Crossflow Jets with Various Orifice Shapes Discharged in Rectangular Open Channel

1
Southwest Research Institute for Water Transport Engineering, Chongqing Jiaotong University, Chongqing 400074, China
2
State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
3
Changjiang Chongqing Waterway Bureau, Chongqing 400074, China
4
School of Shipping and Naval Architecture, Chongqing Jiaotong University, Chongqing 400074, China
*
Author to whom correspondence should be addressed.
Energies 2020, 13(6), 1505; https://doi.org/10.3390/en13061505
Received: 6 February 2020 / Revised: 14 March 2020 / Accepted: 15 March 2020 / Published: 22 March 2020
(This article belongs to the Special Issue Engineering Fluid Dynamics 2019-2020)
Vertical jet in flowing water is a common phenomenon in daily life. To study the flow and turbulent characteristics of different jet orifice shapes and under different velocity ratios, the realizable k-ε turbulent model was adopted to analyze the three-dimensional (3D) flow, turbulence, and vortex characteristics using circular, square, and rectangular jet orifices and velocity ratios of 2, 5, 10, and 15. The following conclusions were drawn: The flow trajectory of the vertical jet in the channel exhibits remarkable 3D characteristics, and the jet orifice and velocity ratio have a significant influence on the flow characteristics of the channel. The heights at which the spiral deflection and maximum turbulent kinetic energy (TKE) occur for the circular jet are the smallest, while those for square jets are the largest. As the shape of the jet orifice changes from a circle to a square and then to a rectangle, the shape formed by the plane of the kidney vortices and the region above it gradually changes from a circle to a pentagon. With the increase in the velocity ratio, the 3D characteristics, maximum TKE, and kidney vortex coverage of the flow all gradually increase. View Full-Text
Keywords: orifice shape; vertical jet; velocity ratio; numerical investigation; hydraulic characteristics orifice shape; vertical jet; velocity ratio; numerical investigation; hydraulic characteristics
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MDPI and ACS Style

Yuan, H.; Hu, R.; Xu, X.; Chen, L.; Peng, Y.; Tan, J. Numerical Investigation of Vertical Crossflow Jets with Various Orifice Shapes Discharged in Rectangular Open Channel. Energies 2020, 13, 1505.

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