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queiia turbina de reaccicin y una pequefia turbina de
impulsos.
Caracteristicas de Desempefio
Ruedas de Imgulsos. Los tipos tipicos de ruedas
de impulsos se ilustran en las figuras 7 y 8. Una in-
stalaci6n tipica se presenta en la figura 13. La op-
timizacicin de cualquier instalaci6n dada, es un pro-
ceso de dos pasos. Primer0 se optimiza la potencia
disponible de1 chorro;
Vj2 V.3
(27) Pj = YQ - = .2 J
29
Y=dJ qj-
a)
b)
that the flow leave at essentially zero velocity.
Under ideal conditions, this occurs when the
peripheral speed of the wheel is one-half the jet
velocity. In practice, optimum power occurs at
speed coefficient + somewhat less than 0.5.
Where
(28) 4, = -L-
fi;i
In fact, best efficiency will occur when + g Cv12
where C, is the velocity coefficient for the nozzle
(29) c,=_----
Vi
i&ii
1 I I I I
I 2 3 4 5
Relative Nozzie Size
Dimenskh Relativa de boquilla
Figura 13 Instalacih de Rneda Pekon
Figure 13 Pelton Wheel Installation
a gruesa en la planta