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一、前言近年来随着汽轮机的大功率化,低压末级叶片的尺寸越来越长,汽轮机低压缸的尺寸也越来越大.目前在运行的三菱公司制造的一百万千瓦火电汽轮机和一百十七万五千千瓦核电站汽论机采用44时低压末级叶片(叶片长1120毫米),其低压缸为高约七米轴向长约十米的大型构件.再者,由于核电机组所占的比例增大,所以最近甚至对一百万千瓦级的大功率火电
I. INTRODUCTION In recent years, with the increase of steam turbine power, the size of the low-pressure last-stage blades has become longer and longer, and the size of the steam turbine’s low-pressure cylinders has become larger and larger. Currently, one million kilowatts of thermal power turbines manufactured by Mitsubishi Corporation One hundred and seventeen five thousand kilowatts nuclear power plant steam theory using 44 hours low pressure last stage blades (blade length 1120 mm), the low pressure cylinder is about seven meters high axial length of about ten meters of large components.Furthermore, due to the nuclear power unit The proportion of the increase, so even for a million kilowatts of high-power thermal power