Experimental Study of the Effect of Guide Vanes Angle on Discharge Coefficient in Triangular and Trapezoidal Labyrinth Weirs

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SHIRMOHAMMADI GHASEM; HEIDARNEJAD MOHAMMAD; PURMOHAMMADI MOHAMMAD HOSSEIN; Masjedi Alireza; Kamanbedast Amirabbas

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Journal: Iranian Journal of Soil and Water Research Year:2020 | Volume:51 | Issue:1 Page(s): 191-199

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Title

Experimental Study of the Effect of Guide Vanes Angle on Discharge Coefficient in Triangular and Trapezoidal Labyrinth Weirs

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Keywords

One-cycle labyrinth weirQ1

Discharge coefficientQ1

Guide vaneQ1

Abstract

The Discharge coefficient of labyrinth weirs increases with increasing the crest length within a certain width range. This study compares the Discharge coefficient in two types of one-cycle triangular and trapezoidal labyrinth weirs. Experiments were conducted on a laboratory flume with length of 6, width of 0. 6 and height of 0. 6 m. The hydraulic performance of one-cycle triangular and trapezoidal labyrinth weirs with two, four and 6 Guide vanes was compared. According to the results, the vanes with a placement angle of 60∘ in the trapezoidal weirs and a placement angle of 45∘ in the triangular weirs on the crests of weirs caused a further increase in the Discharge coefficients of weirs. Consequently, at a constant hydraulic head (Hd/P) of 0. 2, the Discharge coefficient of a trapezoidal weir with two and six Guide vanes increased by 38. 8 and 10. 3%, respectively, as compared to a trapezoidal weir without a Guide vane. Furthermore, at a constant hydraulic head (Hd/P) of 0. 2, the Discharge coefficient of a triangular weir with two and six Guide vanes increased 28. 3% and 11. 7%, respectively, as compared to a triangular weir without a Guide vane.

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APA: Copy

SHIRMOHAMMADI, GHASEM, HEIDARNEJAD, MOHAMMAD, PURMOHAMMADI, MOHAMMAD HOSSEIN, Masjedi, Alireza, & Kamanbedast, Amirabbas. (2020). Experimental Study of the Effect of Guide Vanes Angle on Discharge Coefficient in Triangular and Trapezoidal Labyrinth Weirs. IRANIAN JOURNAL OF SOIL AND WATER RESEARCH, 51(1 ), 191-199. SID. https://sid.ir/paper/368271/en

Vancouver: Copy

SHIRMOHAMMADI GHASEM, HEIDARNEJAD MOHAMMAD, PURMOHAMMADI MOHAMMAD HOSSEIN, Masjedi Alireza, Kamanbedast Amirabbas. Experimental Study of the Effect of Guide Vanes Angle on Discharge Coefficient in Triangular and Trapezoidal Labyrinth Weirs. IRANIAN JOURNAL OF SOIL AND WATER RESEARCH[Internet]. 2020;51(1 ):191-199. Available from: https://sid.ir/paper/368271/en

IEEE: Copy

GHASEM SHIRMOHAMMADI, MOHAMMAD HEIDARNEJAD, MOHAMMAD HOSSEIN PURMOHAMMADI, Alireza Masjedi, and Amirabbas Kamanbedast, “Experimental Study of the Effect of Guide Vanes Angle on Discharge Coefficient in Triangular and Trapezoidal Labyrinth Weirs,” IRANIAN JOURNAL OF SOIL AND WATER RESEARCH, vol. 51, no. 1 , pp. 191–199, 2020, [Online]. Available: https://sid.ir/paper/368271/en

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