Page - 188 - in Book of Full Papers - Symposium Hydro Engineering

Figure 7 Areas for vane insertion on the basin floor Figure 8 Radial distance of vanes from each other  Initial tests of sediment injection in the no-vane mode showed that no sediment remains at a distance of the first ¼ of the radius around the orifice (area 1) (Figure 9). However, at a distance of the next ¾ of the vortex basin radius (areas 2, 3 and 4), most sediments are accumulated. So vane insertion was ignored in area 1. Submerge vanes were inserted in six arrangements. Each arrangement was named according to the vane position area. Since the insertion of several submerge vanes besides each other can affect a larger area, they first were placed separately in the desired radial section in a circle with triplet bunches in areas 2, 3 and 4 called R2, R3, R4, respectively. Then, vane insertions in circles were combined (R2 3, R3 4, R2 3 4 arrangements) to broaden the area affected by one. The effect of this widening was investigated on the sediment removal efficiency. The used arrangements are shown in Figure 10. Figure 9 Initial test of sediment injection in the no-vane mode Figure 10 Arrangements of curvature submerge vanes 3 An Experimental Program In this research, for starting tests, water was entered into the system by pumping. Water flow entered into the vortex settling basin from the inlet channel through the inlet opening under 188