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The industrial steam turbine market is facing substantially increased demand for efficiency improvements, which are the results from consideration of environmental problems, as well as the reduction of plant initial investment cost. To cope with such market trends, Shin Nippon Machinery Co., Ltd. (SNM) is working on developments to reduce various losses in the turbine. Developments have already been completed with respect to, for example, long blades that offer optimum inlet and outlet angles through the application of the twist rule, and blade chip fins and root fins that can reduce the leakage loss in stages. These components have already been installed to actual steam turbines and demonstrated the expected performance. The reduction of profile loss had not been studied for a long period. However, SNM succeeded in establishing the profile loss reduction methodologies thanks to the development of analysis tools in recent years. This paper reports these profile loss methodologies specifically for high-pressure and middle-pressure stages.
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