Question
Download Solution PDFAmong the following impeller arrangements, which impeller of the centrifugal pump offers the maximum efficiency ?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Centrifugal pump:
- Centrifugal pumps are classified as rotodynamic type of pumps in which a dynamic pressure is developed which enables the lifting of liquids from a lower to a higher level.
- The action of a centrifugal pump is just the reverse of radially inward flow reaction turbines (i.e. Radially outward flow) which takes water from the tailrace and delivers it to the head race.
- The centrifugal pump works on the principle of forced vortex flow which means that when a certain mass of liquid is rotated by an external torque, the rise in pressure head of the rotating liquid takes place.
- The rise in pressure head at any point of the rotating liquid is proportional to the square of the tangential velocity of the liquid at that point
- Thus at the outlet of the impeller, where the radius is greater, the rise in pressure head will be greater, and liquid will be discharged at the outlet with a high pressure head.
- Due to this high-pressure head, the liquid can be lifted to a high level.
- Backward curved blades are slightly better in efficiency and are stable over a wide range of flow. While forward-curved blades are used for higher pressure ratio.
- Radial vanes are useful for medium to high-pressure ratios.
Last updated on Jul 15, 2025
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