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As environmental issues have been attracting increasing
attention in recent years, the demand for increasing
the efficiency of steam turbines has also been growing
stronger and stronger. To increase the efficiency of steam
turbines, Shin Nippon Machinery Co., Ltd. (SNM) has
developed a long blade, reduced the leakage loss in
stages, and developed an exhaust diffuser. In developing
the long blade, SNM optimized the entrance and discharge
angles by adopting the "twist" rule. SNM has confirmed
that the long blade has no problem in natural frequency
and strength. In reducing the leakage loss, SNM
decreased the end leakage loss by increasing the number
of blade tip fins, and reduced the mixing loss by using
the blade tip fins. In the development of the exhaust diffuser,
SNM has designed it so that the discharge speed
energy from the final stage is appropriately recovered
in terms of pressure. |
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