%0 Journal Article
%T Experimental Study of the Effect of Guide Vanes Angle on Discharge Coefficient in Triangular and Trapezoidal Labyrinth Weirs
%J Iranian Journal of Soil and Water Research
%I University of Tehran
%Z 2008-479X
%A Agha Shirmohammadi, Ghasem
%A Heidarnejad, Mohammad
%A Pourmohammadi, Mohammad Hossein
%A Masjedi, Alireza
%A Kamanbedast, Amirabbas
%D 2020
%\ 03/20/2020
%V 51
%N 1
%P 191-199
%! Experimental Study of the Effect of Guide Vanes Angle on Discharge Coefficient in Triangular and Trapezoidal Labyrinth Weirs
%K One-cycle labyrinth weir
%K discharge coefficient
%K Guide vane
%R 10.22059/ijswr.2019.273671.668093
%X 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.
%U https://ijswr.ut.ac.ir/article_72340_bb02acf9e292d40d7ada8b5b076b672a.pdf