1. Birla Vishvakarma Mahavidhyalaya
Impact of Jet
(Fluid Power Engineering)
Project conceived by:-
Jay Postiwala( )
Ravi Prajapati( )
Punit Panara( )
Mohit Raina( )
Submitted to:-Prof. M. J. Zinjuvadia
Mechanical department,
Birla Vishvakarma Mahavidhyalaya

3. Force exerted by a jet of water on an asymmetrical curved vane when the jet strikes tangentially at one of the tips:

5. i) Vane angles, so that water enters and leaves without shock.
A jet of water impinges a curved plate with a velocity of 20 m/s making an angle of 20o with the direction of motion of vane at inlet and leaves at 130o to the direction of motion at outlet. The vane is moving with a velocity of 10 m/s.
i) Vane angles, so that water enters and leaves without shock.
ii) Work done/s
V1 = 20 m/s
U1 = U2 = 10 m/s
Assuming number loss Vr1 = Vr2
Vw1 = 20 cos 20 = m/s
Vf1 = 20 sin 20 = 6.84 m/s

7. Jet Propulsion
Jet propulsion means propulsion or movement of the bodies such as ships , rockets, aircrafts etc with the help of jet.
The reaction of the jet coming out from the nozzle attached to the bodies is used to move the bodies.
A/c Newton’s third law of motion, every action there is an equal and opposite reaction.
The fluid coming out from the nozzle exerts a force on the nozzle in the opposite direction.

8. Jet Propulsion of Ships
By the application of jet propulsion,
the ship is driven through a water.
jet of water is discharged at the back of ships, exerts a propulsive force on the ship.
The ship carries a centrifugal pump which draws a water from surrounding sea.
The water is discharged through the orifice which is fitted at the back of the ship in the form of jet.

9. Case-1 Jet propulsion of the ship, when inlet orifice is at right angle to the direction of motion of ship
V = velocity of jet coming out at the back of ship. U = velocity of ship = relative velocity of jet w.r.t ship V and U are in opposite direction . Relative velocity of jet w.r.t ship = V +U Mass of jet issuing from nozzle at the back of ship = ρa (V +U) Force exerted by the jet on the ship = mass of water issuing/s x change in velocity F = ρa (V +U) x ( - u ) = ρa (V +U) x ((V +U) –u) F = ρaV (V +U) Work done = F x u = ρaV (V +U) x u

11. Case-2 Jet propulsion of the ship, when inlet orifice facing the direction of motion of ship

13. REFERENCES www.creativelabengineers.com
staff.fit.ac.cy/eng.fm/.../Fluids%20Lab%20Impact%20of%20 a%20Jet.
A text book of fluid mechanics and hydraulic machines by Dr.R.K.Bansal
A text book of fluid mechanics and hydraulic machines by R.K.Rajput
A text book of fluid mechanics and hydraulic machines by D.S.Kumar