The initial blade angle and the relative velocity of the water flows onto the blades of the impeller.
Explanation of Solution
Given:
Mean radius
Discharge
Angular speed of the impeller
Calculation:
Calculate the velocity at the midpoint of the impeller
Calculate the axial velocity of the water through the impeller
Draw the kinematic diagram of the water at the lead of the blade as shown in Figure (I).
Calculate the initial blade angle
Thus, the initial blade angle is
Calculate the relative velocity of the water
Thus, the relative velocity of the water flows on to the blades of the impeller is
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Chapter 14 Solutions
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