QUESTION 1: 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: The impeller inlet (i) diameter and inlet blade velocity. (Hint - Substitution: Vn in terms of Di and U, in terms of D, both sub into Tan of Blade inlet angle, only unknown is then solving for D?) ANS: 300 mm; 14.42 m/s 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 U. sub in Euler equation only unknown then is solve for Vwo) ANS: Vwo = 11.54 m/s; 23.1 m/s 1.1. 1.2. 1.3. Impeller outer diameter. ANS: 480 mm 1.4. If the flow through velocity is consistent through the pump find the fluid velocity at outlet. ANS: Vao = 13.06 m/s 1.5. What is the manometric head if the suction gauge shows -30kPa and the delivery gauge shows 210 kPa? ANS: 24.43 m
QUESTION 1: 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: The impeller inlet (i) diameter and inlet blade velocity. (Hint - Substitution: Vn in terms of Di and U, in terms of D, both sub into Tan of Blade inlet angle, only unknown is then solving for D?) ANS: 300 mm; 14.42 m/s 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 U. sub in Euler equation only unknown then is solve for Vwo) ANS: Vwo = 11.54 m/s; 23.1 m/s 1.1. 1.2. 1.3. Impeller outer diameter. ANS: 480 mm 1.4. If the flow through velocity is consistent through the pump find the fluid velocity at outlet. ANS: Vao = 13.06 m/s 1.5. What is the manometric head if the suction gauge shows -30kPa and the delivery gauge shows 210 kPa? ANS: 24.43 m
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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Transcribed Image Text:Complete the following tasks:
QUESTION 1:
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:
1.1.
The impeller inlet (i) diameter and inlet blade velocity.
(Hint - Substitution: Vn in terms of Di and U, in terms of D; both sub into Tan of Blade inlet angle,
only unknown is then solving for D?)
ANS: 300 mm; 14.42 m/s
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 U. sub in Euler equation only
unknown then is solve for Vwo)
ANS: Vwo = 11.54 m/s; 23.1 m/s
1.2.
1.3. Impeller outer diameter.
ANS: 480 mm
1.4.
If the flow through velocity is consistent through the pump find the fluid velocity at
outlet.
ANS: Vao = 13.06 m/s
What is the manometric head if the suction gauge shows -30kPa and the delivery
gauge shows 210 kPa?
1.5.
ANS: 24.43 m
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