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一、绪言六十年代初期由上海汽轮机厂设计,并由上海汽轮机厂、北京重型电机厂、武汉汽轮发电机厂等制造厂、长春等电修造厂生产的31—25—7(N25—35)型汽轮机,是一种效率高的中压机组。据不完全统计,截自1984年底已运行的有101台,大部份分布在华北、西北、西南、中南等中小型火电厂发电用,少部分做为拖动用。该型机组是上海汽轮机厂新设计,末三级采用叉型叶根的自由叶片。尽管自由叶片效率高、加工简单,设计计算也较准确等优点,因设计制造缺少经验,试验研究工作落
I. INTRODUCTION The Shanghai Steam Turbine Plant was designed by the Shanghai Steam Turbine Plant in the early 1960s and was constructed by Shanghai Steam Turbine Works, Beijing Heavy-duty Electric Works, Wuhan Turbine-Generator Works and other electrician repair factories and Changchun Electric Power Manufacturing Plant, such as 31-25-7 (N25-35 ) Turbine, is a high efficiency medium voltage unit. According to incomplete statistics, there are 101 units that have been operating since the end of 1984, most of which are for power generation in small and medium-sized thermal power plants in North China, Northwest China, Southwest China, Central South China, and a few of them are used as power plants. This type of unit is the new design of Shanghai Steam Turbine Works, the last three leaves with free-leaf prongs. Despite the high efficiency of free blades, simple processing, design calculations are more accurate, due to lack of experience in the design and manufacture, experimental research work