Page 317 - Alternative Energy Systems in Building Design
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TIDAL POWER GENERATION 291
GENERATOR
BULB HANGER
TURBINE
Figure 9.2 Diagram of a
WATERFLOW DISTRIBUTER bulb turbine.
(Fig. 9.2). In this type of system, water flows around the turbine, making access
for maintenance difficult because the water must be prevented from flowing past
the turbine.
Rim turbines Another type of mechanism, referred to as a rim turbine (Fig. 9.3),
can be seen at the Straflo turbine, in Annapolis Royal in Nova Scotia, Canada. The
turbine overcomes maintenance access problem by mounting the generator in the bar-
rage, at right angles to the turbine blades. However, this makes it difficult to regulate
the performance of the turbine, and it is unsuitable for use in pumping applications.
Another proposed turbine construction involves the use of a design where the blades
are connected to a long shaft and are orientated at an angle so that the generator is
mounted on top of the barrage. Figure 9.4 shows a tubular turbine diagram.
GENERATOR
TURBINE
Figure 9.3 Diagram of a rim
FLOWING WATER turbine.
