Page - 187 - in Book of Full Papers - Symposium Hydro Engineering

Figure 4 Profile of curvature submerge vanes Figure 5 Vanes submerge with six types of curvature To place vanes in the basin floor and achieve the ordered and optimum arrangement, various conditions were considered:  To evaluate the effect of longitudinal distances of vanes on the vortex basin efficiency, its floor was divided into radial sections with the same angle. The longitudinal distance was examined in three modes with 4, 6 and 8 radial sections with identical angles which were 90, 60 and 45 degrees, respectively. The radial sections are called S4, S6 and S8, as shown in Figure 6. Figure 6 Radial sections of vanes  To evaluate the radial distance of vanes from the flushing orifice, the basin floor was divided into four equal-interval concentric circles. Figure 7 shows circles with the number of areas intended for them.  For vanes to affect vortex flow more, another vane was placed between the vanes. The radial distance of vanes from each other considered the constant δn=3Hv (Odgaard and Kennedy 1983). 187