Answered: A centrifugal pump consists out of an…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

A centrifugal pump consists out of an impeller, diffuser and casing and is powered by 300
kW (shaft power) and rotates at 96.3 rad/s. The flow rate generated by the machine is
54.7 Kilo-litres/min. The impeller blade inlet angle and width is 23° and 180 mm
respectively. The blades occupy 12% of the impeller area and the water is assumed to
enter the impeller radially. Suction and delivery pipes are equal in size.
Determine:

a) If the pump has a mechanical efficiency of 80%, calculate the blade velocity at
outlet (Uo) and outlet whirl velocity Vwo. Assume the blade exit angle equal to the
guide vane angle. (Hint - Substitution: Write Vwo in terms of Uo sub in Euler equation only
unknown then is solve for Vwo)

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