Chapter 14
IMPULSE OF JETS
Force exerted by the jet normal to the plate
Pn = ρaV2
a = area of jet
V = velocity of jet
u = plate velocity
Pn = ρa(V – u)2
Work done per second (W) = Pn × u = ra[V – u]2 × u
Pn = ρaV(V – u)
Work done by the jet = Pn × U
W = ρaV(V – u)u
Efficiency of the work done of wheel h =
at ,
Pn = ρaV2 (1 + cos q)
Force exerted by a jet in its direction of flow on a curved vane is always greater than that exerted on a flat plate.
Force Exerted By a jet on a Hinged Plate