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: ln in terms of D and U, in terms of D, both sub into Tan of Blade inlet angle, only unknown is then solving for Dz) 1.2. If the pump has a mechanical efficiency of 80%, calculate the blade velocity at outlet (U.) and outlet whirl velocity Vw.. Assume the blade exit angle equal to the guide vane angle. (Hint - Substitution: Write Vw in terms of U, sub in Euler equation only
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: ln in terms of D and U, in terms of D, both sub into Tan of Blade inlet angle,
only unknown is then solving for Dz)
1.2.
If the pump has a
outlet (U.) and outlet whirl velocity Vw.. Assume the blade exit angle equal to the
guide vane angle. (Hint - Substitution: Write Vw in terms of U, sub in Euler equation only
unknown then is solve for Vwo)
1 3
Impeller outer diameter.
1.4,
If the flow through velocity is consistent through the pump find the fluid velocity at
outlet
1 5
What is the manometric head
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