Physics · 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 angles result in longer blades and higher flow resistance.✓
- 2Small angles cause severe cavitation at the inlet.
- 3Small angles increase the impeller weight and cost.
- 4Small angles reduce the discharge pressure significantly.
Correct answer
Small angles result in longer blades and higher flow resistance.
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