Question

QUESTION 3 n angle of 220 to the tangent as shown in the figure 1. The area of the outer periphery is 0.65 m, the pump discharges Centrifugal pump impeller has an outer diameter of 15 m and rotating at 210 RPM The outlet vane angle 1550 L/s and the flow at inlet is radial. The exit velocity triangle of this question is shown in Figure 2. set back at Centrifugal impeller with backward facing vane Figure (ы 2 W. (a) Us W2 (d) (c) W Figure 2: Velocity triangles Which one of the velocity triangles shown in figure 2 represents the one at the exit of a centrifugal impeller with backward curved vanes? (U2. peripheral velocity. V2 absolute velocity. W2 relative velocity) 7.64 B.3 08 CA D.5 64 m/s) is The peripheral velocity U2 E 148.6 The relative velocity W2 (in m/s) is F 182 The whil velocity Vu2 (in m/s) is G. 13.19 The power developed (in kW) Н.с JB K 162 5

Answer 1

Puestion Solution Given Pata Disthosye 1-550 m3 sec 1550 L Sea Diamelu (D) 15m (A2) at Outiet - ° Outer 0.65m2 Adea Outeu 2.2 Vame 2 loR PM Sped Flou at Radial the nlet V2 Veleity Buing is Cor Outtet oR eacit op Tiem 니2 VaTiye Inlet Caroreot op Tien U2 is TT D2 N Penouiphesal Velecity 60 2TTX 15x 210 6 0 6.5m Isic

"ext Velety ge VF = Flous VF2 p-22 B VF2 Vur A C-BC Vu22 VF2 tonp 1550 VF2 = A2 2.3846 mlsec O. 65

Relative Velsaty The 2 VF2 2.3846 Sm 22 6.3656 mlsco Co2= tehid Velocity V dhe Vu, = VF2 16.5 2.3846 tan 22 Vuz 0o 6 m COD Power duelo ped Ihe m V h PrC l0.6x 165- o PE Flous s Rodaf 16-5) (106 ct X 6.5 100ox O.65 113-685X103 uw P P 113.685 kw