Question

Question of a Question 3 16 points The impeller of a centrifugal pump has the outer diameter of 0.7m the rotational speed 100 rpm, area of the outer periphery 014 m? and angle of the war ovet 2 18the urgereine drawn to the impeller circumference. The flow at the pumpinietis radial and the radial flow velocity is uniform throughout the pump. The pump shapes of water Find - The radial flow velocity at the pump outlet in A4512 3763 - The specific work input in kg) 1235 DM43 E. 5.35 6.7.34 G2534 H325

Answer 1

& the impeller of a centrifugal pump has the cutes diameter of o.Tm, the rotational speed 8000pm, area of outes periphery 0.14 m² and angle of the rane at outlet ₂ = 180 to the tangent dine drawn to the impeller circumference the flow at the pump inlet is radial and the radial flow relocity is uniform throughout the pump. The pump discharges 0.75 m3 / see of water. solution : sketch of impeller to draw the nelocity diagram Von - Una = 7 U2 is reedial Component of relocity at exit B2 To Cemiya kote => Flow rate through Vario pump is Q = 0.75m3 flow rate at enit = @= (Area of outer perphery) x (Radial relocity Component at L Q = (A) (Vn2) enit) Papon I Norme 0.75 = 0.14 Una 0705 resby New edoni Vn₂ = 0.75 0.14 = 5.35m/ see Well M₂ = 5.35m/see option is E is correct, auswes for part one Can ED KEN MOR MOZA TYAN IKIS RAGU

(Velocity triangle at inlet for impeller) [1, = Vn ] as there is no whirl component at inlet to the pump. ---- ( velocity triangle at the outlet for impeller) B2 A in problem it is given that fluid enters the impeller with a purely radial absolute velocity, then fluid entering the impeller has no angular momentum and it is zero. " H = U₂ Vez [read developed by pump] bee Specific work output = U₂ Vtz Vta = U₂ - Vr, cosßa and Vrz sink = Vn2 . Vt2 = U₂ - Vn. Cos B2 sinß2

How U2 = WR₂ = cox2R = (80424 )x (0:1) ₂ = 29.321 ml see Vtz = 4 - Vn cosp2 Sink2 - U₂ - Vn2 tamBz V+z = (29.321)< – (5.352 t2 = 12.85539 m/see So specific work output developed by pump W = UaVt2 = (29.321) (12.855) So, Answes in B w = 316.932 J/kg for part &