The Steam Turbine
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-292
2025-11-25
44
is another kind of steam engine, in which expanding steam strikes directly upon curved blades in a wheel, causing it to rotate by impact or by reaction, just as the turbine water wheel does . The principle of a simple turbine is illustrated in Fig. 1, which shows how steam is delivered to the blades of the wheel through four tubes. In each of these tubes there is a check valve which permits only the proper amount of steam to pass through. On escaping through this, the steam acquires a high velocity in expanding, and strikes upon the blades of the wheel with great force.
Another type of turbine is divided into stages; that is, there are several rotating wheels for each set of steam pipes.
Figure 2 shows how the steam may be passed from the steam nozzles N through three sets of moving blades M by the use of two sets of stationary blades S. By this arrangement the energy of the steam is used with a high degree of efficiency. The steam turbine is used to drive the dynamos in some of the largest plants for the generation of electric current.
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