General Studies · Fluid Machinery
In centrifugal pump design, why is the outlet vane angle usually NOT made smaller than about 20°, even though smaller angles may theoretically improve manometric efficiency?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Small outlet vane angles result in longer blades and higher flow resistance✓
- 2Large outlet vane angles help to maintain constant discharge pressure
- 3Small outlet vane angles increase suction pressure and cause cavitation
- 4Large outlet vane angles reduce impeller weight and lower cost
Correct answer
Small outlet vane angles result in longer blades and higher flow resistance
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