Design an Axial flow pump impeller 60 cm ,for 50 hp 400 rpm

Driving up water in bulk quantities by axial flow impeller fitted pumps
The water enter the vane gap by running along with rotor and jump into it.
Thereby a powerfull water path is generated around the suction end .
I order to avoid the energy loss due to this circulation and expenditure of energy , we have to introduce a deflected.
It is essential to give at least a taper impeller in downward direction.
so that the water enter through low energy region having less velocity.
Design of an impeller start with the calculation of theoretical output based on simple calculation .
HP =KG _M.
1 HP =75 KG M.
30 HP AT 3 M = 30 X 75 /3= 750 liter pe second.
Area of flow is determined by a elicits of 4 m per second .
Area =750/0.4 =3000 cm2 .
velocity of impeller is equal to1.5 mhead per second at hub .And head at impeller tip is 4 times .
v=root of 2gh.
2x 9.81 x7.=root of 140 =11.7 m per sc.
Hub diameter is 40 percent of blade diameter .
Area of pipe = area of flow plus area of hub.
3000+25 %=3750 cm2 .
Diameter is root of 3750/pi/4=60 cm approx .
circumference of pipe =pi. D =188 cm or 1.88 m
speed of impeller =12/1.88=7 rps.
Rpm = 7x60 =420.Rpm

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