0107 Lecture8_PumpsandFansFull

0107 Lecture8_PumpsandFansFull - Systems PumpsandFans...

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    1 MER 439 - Design of Thermal Fluid  Systems Pumps and Fans Professor Anderson Winter Term 2010
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    2 Outline Curves Avoiding Cavitation (Tuesday) Flow Meters (Tuesday)
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    3 Machines for Extracting Work (Power) from a Fluid Hydraulic Turbines (Impulse and Reaction) Gas Turbines (Impulse and Reaction)
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    4 Pumps, Fans, Blowers, Compressors Machines for Doing Work on a Fluid
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    5 A pump is a machine that expends energy to  increase the pressure of a fluid (liquid or gas)  and move it from one point to another.  Pumps => Liquids Fans => Air In this lecture we will learn about pump types,  pump performance curves and some general  guidelines for selecting a pump. Introduction
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    6 Pump Types – 2 General Categories (1)  Dynamic  Pumps :  These  pumps  use  a rotating component to impart energy to the fluid  in  the  form  of  high  velocity,  high pressure or high temperature. (2)  Positive  Displacement  Pumps :  Have  a fixed  volume  chamber  that  takes  in  and discharges the pumped fluid. 
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  7 Dynamic Pumps Dynamic Pumps can be classified according to  the  direction  of  the  flow  with  respect  to the rotation axis. (1) Radial Flow  (2) Axial Flow (3) Mixed Flow
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  8 Radial Flow (Centrifugal) Pumps Two main components:  The  impeller  consists of a number of blades  (vanes) arranged in a regular pattern about the  shaft. The  casing  (housing) encloses the impeller
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  9 Radial Flow (Centrifugal) Pumps Energy is added to the fluid by the rotating blades Both pressure and absolute velocity are  increased The casing is designed to slow the fluid and  convert the KE of the fluid to an increase in  pressure.
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  10 Axial Flow Pumps Used in low pressure  drop applications.  The motor rotates on a shaft onto which the 
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This note was uploaded on 01/07/2011 for the course ENGLISH 1303 taught by Professor May during the Spring '10 term at HKU.

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0107 Lecture8_PumpsandFansFull - Systems PumpsandFans...

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