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Lecture%2022_Fluid%20Machinery_2

Lecture%2022_Fluid%20Machinery_2 - ME309 Fall 2009 Lecture...

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ME309 Fall 2009 Lecture 22: Fluid Machinery Andrew Lee Maurice J. Zucrow Laboratories Purdue University West Lafayette, Indiana
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11/2/2009 Andrew Lee 2 Performance Characteristics Typical centrifugal (radial flow) pump test setup Model 49635KXX McMaster-Carr P P Hydraulic power, W h Pump head, H p Motor power output, W m Pump efficiency, uni0220 p Best efficiency point, BEP
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11/2/2009 Andrew Lee 3 Performance Characteristics
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11/2/2009 Andrew Lee 4 Performance Characteristics Typical pump test procedures: 1. Valve is closed (‘shutoff’ or zero flow) 2. Pump speed is set to a fixed value 3. Measurements (pressure, motor power input, etc) are made between the shutoff and maximum flow rate
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11/2/2009 Andrew Lee 5 Performance Characteristics Q Hp uni0220 p Common experimental observations for pump tested at a constant speed Hp is the highest at shutoff and decreases slowly with Q uni0220 p is zero at shutoff, increases gradually to BEP, and decreases at higher Q
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11/2/2009 Andrew Lee 6 Performance Characteristics Example: Find the pump efficiency at the following operating condition Q(gpm): 550 Hp (ft): 200 Power input (hp): 40
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