541 OF ENGINEERING FOKMULÆ.
Foürneyron’s Turbines—continued.
GUIDES.
Radius of curve m .. .. = Internal radius of
turbine.
Length of curve m .. .. — Distance of guides
apart on their
periphery.
Angle of radius of curve m = 18° with internal
radius of turbine.
Radius of curve n .. .. = | internal radius
of turbine.
IIigh-pressuek Turbines.
h = Head of water in feet.
Q = Quantity of water required for each 10 horse-power.
V = Velocity of turbine at periphery in feet per second.
h = 30 40 50 60 70 80 90 100 120 140 160 180 200
Q= 4’2 3-1 2-5 2*1 1*8 1-6 1-41-2T 1-05 0-9 -8 '63
V= 36 42 47 51 55 59 63 66 73 78 84 89 94
Hydraulic Ram.
Q = Quantity of water used in’ cube feet per
minute.
h — Head of water in feet.
P — Effective horse-power.
OOI p
q = ^1±.. P=-00113QA.
h
The length of the supply-pipe should not be
less than |ths of the height to which the water is
to be raised. .
Diameter of supply-pipe = 1 • 45 VQ.
Ditto of rising pipe .. = '75 VQ.
Contents of air-vessel = contents of rising pipe.
|th of the water may be raised to about 4 times
the head of supply, or eight times, or -J^th
sixteen times, &c.