Page 295 - Centrifugal Pumps Design and Application
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Hydraulic Power Recovery Turbines 263
Figure 14-11. Typical performance characteristics for an HPRT with fixed guide
vanes.
Figure 14-12. Typical performance characteristics for an HPRT with an adjust-
able guide vane assembly.
The typical performance characteristic curves for an HPRT with an ad-
justable guide vane assembly are shown in Figure 14-12. The adjustable
guide vane assembly performs, as one can see, as a variable orifice in a
large number of fixed-pressure-differential systems. The vane setting
will control the flow at a certain differential pressure.
In Figure 14-13, the best efficiency points of each vane setting or open-
ing are connected to a single line and compared with the efficiency curve
of a hydraulic turbine with fixed inlet vanes. Because the runner is de-
