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

Hao Yuan, Ruichang Hu, Xiaoming Xu, Liang Chen, Yongqin Peng and Jiawan Tan
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Hao Yuan: Southwest Research Institute for Water Transport Engineering, Chongqing Jiaotong University, Chongqing 400074, China
Ruichang Hu: State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
Xiaoming Xu: Changjiang Chongqing Waterway Bureau, Chongqing 400074, China
Liang Chen: Southwest Research Institute for Water Transport Engineering, Chongqing Jiaotong University, Chongqing 400074, China
Yongqin Peng: Southwest Research Institute for Water Transport Engineering, Chongqing Jiaotong University, Chongqing 400074, China
Jiawan Tan: School of Shipping and Naval Architecture, Chongqing Jiaotong University, Chongqing 400074, China

Energies, 2020, vol. 13, issue 6, 1-15

Abstract: 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.

Keywords: orifice shape; vertical jet; velocity ratio; numerical investigation; hydraulic characteristics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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