IMPACT OF JET ON VANES

IMPACT OF JET ON VANES
Aim: To find the Coeffient of Impact for a given vane.
Apparatus Used: Centrifugal pump, Lever arm with balance, water meter.
Theory: Impact of jet definition, Flat vane, curved vane and Inclined vane.
Procedure:
1. Fix the Vane (Flat/Inclined/Hemispherical) inside the water chamber. Adjust the lever arm using the counterweight weight such that the balance reads Zero.
2. Note down the diameter of the nozzle and fix it to the end of the pipe inside the chamber.
3. Close the door of the chamber firmly.
4. Start the centrifugal pump. The jet starts striking the vane.
5. Adjust the delivery valve such that the discharge from the delivery pipe is 10litres per minute.
6. Note down the actual force on the balance which is placed opposite to the counter weight and on top of the chamber.
7. Repeat this procedure for 15, 20,25 and 30lpm
8. Repeat the procedure for different vanes and different nozzle diameter.

Calculations:
Coeffient of Impact, Ci= Actual force/Theoretical force
Actual force, Fa, Directly from the experiment in kgs.
Fa in Newtons= kg*9.81 N
Theoretical Force, Ft:
1. Flat vane, Ft= ρav2 N
2. For Inclined Vane, Ft = ρav2 Sin θ N
3. For Hemispherical Vane, Ft, = ρav2 N
ρ= 1000kg/m3
a= Area of the nozzle, Πd2/4; d= Dia of the nozzle in m.
V= Q/a m/s
Q= x LpM = x/(60*1000) m3/s
Ci= Fa / Ft

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