Effects of the location of the nozzle on scour due to wall jets

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Nemati Soheil; MEHRAEIN MOJTABA

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Journal: JOURNAL OF HYDRAULICS Year:2019 | Volume:14 | Issue:2 (142) Page(s): 1-15

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Title

Effects of the location of the nozzle on scour due to wall jets

Author(s)

Nemati Soheil | MEHRAEIN MOJTABA | Issue Writer Certificate

Keywords

Local scourQ2

Experimental investigationQ2

3d wall jetQ1

Wall jet locationQ2

Abstract

The scour due to jets influence the stability of the base of the dam the downstream structures and may cause them failure. In this paper the results of 40 experiments of scour due to 3D-wall jets are presented. In this research, 3 values of densimetric Froude number in the range of 3. 9-6. 6, 5 values of tailwater ratio in the range of 4-15 and 3 values of the location of the wall jet from the side wall in the range of 0. 5-17. 3 were used. In this research the mechanism of the scour is reported, then the effect of the side wall on scour due to wall jets for different values of tailwatre depth ratio and densimetric Froude number is investigated. According to the results of this research by decreasing the distance of the nozzle to the channel side wall, the jet deviates to the side wall and forms the asymmetrical shape of flow structures as the maximum scour hole depth due to the nearest jet nozzle increases 94% as compare to the jet in the middle of the channel. In addition, the length of the scour hole decreases as the jet goes to the side wall of the channel. In most of the experiments the minimum scour hole length decreases about 13% for the nearest nozzle to the channel side wall as compare to the nozzle in the middle of the channel. In some cases the tailwater depth influences the scour hole length parameters an increases them. According to this research one can concluded that the location of the nozzle affect the scour hole dimensions and should be considered as an effective parameters on scour hole due to wall jets.

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APA: Copy

Nemati, Soheil, & MEHRAEIN, MOJTABA. (2019). Effects of the location of the nozzle on scour due to wall jets. JOURNAL OF HYDRAULICS, 14(2 (142) ), 1-15. SID. https://sid.ir/paper/124176/en

Vancouver: Copy

Nemati Soheil, MEHRAEIN MOJTABA. Effects of the location of the nozzle on scour due to wall jets. JOURNAL OF HYDRAULICS[Internet]. 2019;14(2 (142) ):1-15. Available from: https://sid.ir/paper/124176/en

IEEE: Copy

Soheil Nemati, and MOJTABA MEHRAEIN, “Effects of the location of the nozzle on scour due to wall jets,” JOURNAL OF HYDRAULICS, vol. 14, no. 2 (142) , pp. 1–15, 2019, [Online]. Available: https://sid.ir/paper/124176/en

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