A backward-facing centrifugal pump (PKM-P01BF) has be pump operates at 1500 rpm. The impeller inlet radius, r₁ radius, r2 = 160 mm. The inlet and outlet blade widths, enters the pump radially at a rate of 0.4 m³/s. The exit blad a) the inlet blade angle, B₁, b) the tangential velocity at the exit, V2.1, and

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A backward-facing centrifugal pump (PKM-P01BF) has been used for almost 10 years. The
pump operates at 1500 rpm. The impeller inlet radius, r₁ = 40 mm, and the impeller outlet
radius, r2 = 160 mm. The inlet and outlet blade widths, b₁ and b2 are both 50 mm. Water
enters the pump radially at a rate of 0.4 m³/s. The exit blade angle, ₂= 25° Determine:
a) the inlet blade angle, ₁.
b) the tangential velocity at the exit, V2.1, and
c) the power transferred to the shaft, Wshaft.
d) An engineer is tasked to replace the old pump (PKM-P01BF) with a new forward-facing
centrifugal pump (PKM-P01FF). Both pumps are similar in size and rotates at 1500 rpm.
Water also enters the new pump radially at a rate of 0.4 m³/s and the exit blade angle, 2
= 120°. Determine if the new pump will produce a better head. Show proof of calculation.
Take density of water, p = 1000 kg/m³
Transcribed Image Text:A backward-facing centrifugal pump (PKM-P01BF) has been used for almost 10 years. The pump operates at 1500 rpm. The impeller inlet radius, r₁ = 40 mm, and the impeller outlet radius, r2 = 160 mm. The inlet and outlet blade widths, b₁ and b2 are both 50 mm. Water enters the pump radially at a rate of 0.4 m³/s. The exit blade angle, ₂= 25° Determine: a) the inlet blade angle, ₁. b) the tangential velocity at the exit, V2.1, and c) the power transferred to the shaft, Wshaft. d) An engineer is tasked to replace the old pump (PKM-P01BF) with a new forward-facing centrifugal pump (PKM-P01FF). Both pumps are similar in size and rotates at 1500 rpm. Water also enters the new pump radially at a rate of 0.4 m³/s and the exit blade angle, 2 = 120°. Determine if the new pump will produce a better head. Show proof of calculation. Take density of water, p = 1000 kg/m³
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