Thus for steady,
uniform flow the principle of angular impulse and angular momentum for
pumps simplifies
to: let
1 denote the entrance and 2 denote the exit on the vanes of the impeller
ρ Q [ r2 Vt2 ˗
r1 Vt1
] =
Tz
|
where ρ Q
is the mass flow rate crossing the control surface (It will be the same
entering and leaving the
control surface.) ρ
Q = dm/dt
r2 Vt2 where
r2 is the radial distance on the vane at the exit and Vt2
is the tangential
component of the
absolute fluid velocity of the fluid particle at the exit
r1 Vt1 where
r1 is the radial distance on the vane at the entrance and
Vt1 is the tangential
component of the
absolute fluid velocity of the fluid particle at the entrance
Tz is the net torque driving the pump Click here to continue discussion. |