Session K.pdf - Clarkson University

purities from getting into the withdrawal with help of umbrella-like strainers and a ‘hydraulicround-about’, which spins water by pumping it through tangential-oriented pipes(Shatalina, etc., 1994). The impurities getting into the flow are carried out from underthe withdrawal cap. The proposed version of a ‘hydraulic round-about’ can protect oilimpurities, frazil, whitebaits, water plants, etc from getting into withdrawals. The constructionof the ‘hydraulic round-about’ under the cap of the umbrella-like strainer isshown in fig.1.Fig.1 The construction of the ’hydraulic round-about’ under the cap of the umbrella-like:1 – the cylindrical part of the withdrawal cap; 2 – the strainer;3 – the pipe, delivering water to the ‘hydraulic round-about’; 4 – L-shaped nozzlesExperimental investigations of the ‘hydraulic round-about’. Investigations of the‘hydraulic round-about’ was performed on the withdrawal model scaled downas 1 to 23. With the diameter of the ‘umbrella’ 0,280 m and its height 0,191 m.Underthe ‘umbrella’ there were two tangential-oriented nozzles with diameters 0,012 m. Thewater discharge of the withdrawal was 0,2 – 0,5 l/sec, the discharge of the ‘hydraulicround-about’ changed from 0,1 to 0,5 l/sec. The equipment was built in the availablehydraulic test bench, which had a delivery tank (with the fall of 2 m), a supply and aworking part of 2,0 x 0,58 1,26 m in size, two centrifugal pumps with discharges 10l/sec and 3 l/sec. Water delivered both to the working part of the bench imitating a riverflow and to the ‘hydraulic round-about’. The pump with the larger discharge kept thetank water level constant and the second pump imitated the pump collecting water fromthe river. The water discharges were adjusted with help of measure diaphragms accordingto the difference of the piezometer levels. The accuracy of the discharge measurementwas 0,5 – 1,5 %.338