Centrifugal pump impeller design: Typical maximum vane exit angle at outlet. Select the most appropriate range for the maximum vane exit angle (degrees) used in practice. Choose the correct range.
Mechanical Engineering
Hydraulic Machines
Difficulty: Easy
Choose an option
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A10° to 15°
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B15° to 20°
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C20° to 25°
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D25° to 30°
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E30° to 40°
Answer
Correct Answer: 25° to 30°
Explanation
Rule of thumb
- For radial-flow centrifugal pumps, the outlet (vane exit) angle is commonly in the range of ~20°–30° to balance head, efficiency, and cavitation performance.
Why 25°–30°Angles smaller than ~20° may increase recirculation losses; much larger angles can cause shock and higher losses. Designers often cap the maximum near 30°.
Final Answer25° to 30°