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Published bySherilyn Spencer Modified over 9 years ago
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Fluid Mechanics LAB: Dynamic Pumps and Cavitation
ENTC - 303 ENTC-303 PROF. ALVARADO
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Dynamic Pumps Kinetic or dynamic pumps add energy to the fluid by accelerating it through the action of a rotating impeller. ENTC-303 PROF. ALVARADO
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Classification of dynamic pumps
Kinetic or dynamic Pumps Radial Flow (Centrifugal) Axial flow (propeller) Mixed flow ENTC-303 PROF. ALVARADO
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Performance of Centrifugal Pumps
ENTC-303 PROF. ALVARADO
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System and Pump Operating Point
The operating point of the system is changed by flow control valve ENTC-303
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If below vapor pressure, cavitation occurs
Cavitation is the formation of vapor cavities due to the decrease of the suction pressure to a value below the vapor pressure. If below vapor pressure, cavitation occurs ENTC-303 PROF. ALVARADO
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Net Positive Suction Head
ENTC-370 PROF. ALVARADO
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Pump efficiency The overall pump efficiency is a product of the volumetric efficiency and the mechanical efficiency ENTC-303 PROF. ALVARADO
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Pump efficiency (P is in Pa; QA and QT are in m3/s; T is in N-m; N is in Rev Per Second (RPS)) ENTC-303
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Overall Efficiency = Vol.Efficiency x Mech.Efficiency
Pump efficiency Overall Efficiency = Vol.Efficiency x Mech.Efficiency Actual Power Out = P x QA Actual Power In = Electrical Power Input (Watts) ENTC-303 PROF. ALVARADO
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Suction Pressure (psig) Discharge Pressure (psig)
Trail No. Flow Rate (GPM) Suction Pressure (psig) Discharge Pressure (psig) Pressure Difference (psig) Input Current (Amps) Input Voltage (V) 1 2 3 4 5 ENTC-303 PROF. ALVARADO
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Suction Pressure (psig) Discharge Pressure (psig)
Trail No. Frequency (Hz) Flow Rate (GPM) Suction Pressure (psig) Discharge Pressure (psig) Pressure Difference (psig) 1 15 2 20 3 25 4 30 5 35 6 40 ENTC-303 PROF. ALVARADO
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References Applied Fluid Mechanics, Robert L. Mott www.gewater.com
ENTC-303 PROF. ALVARADO
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