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大功率汽轮机的高压级隔板处于高压差下工作,容积流量小使静叶的叶高较小,为保证隔板的强度和刚度的安全性要求,必须采用宽的静叶型。这样导致叶型弦长大,相对叶高更小,端损增加,大大增加静叶损失,级效率下降。为减少高压级中的短静叶片对级效率的影响,一般采用加长型的静叶型或带加强筋的窄静叶型。前者在高、中压缸采用除了能保证隔板的强度、刚度要求外,同时还可满足调频的要求。国产大功率汽轮机高压级采用加强筋结构的有上海汽轮机
High-pressure steam turbine high-pressure level diaphragm in the work under high pressure, low volume flow so that leaves the blade height is small, in order to ensure the strength and stiffness of the diaphragm safety requirements, must be wide vane type. This led to leaf-type chord length, the relative leaf height smaller, increased end-loss, greatly increasing the static leaf loss, grade efficiency decline. In order to reduce the effect of the short stator blades on the stage efficiency in the high-pressure stage, longer stator blades or narrow stator blades with stiffeners are generally used. The former in high and medium pressure cylinder used in addition to ensuring the strength of the separator, the stiffness requirements, but also to meet the requirements of FM. China-made high-power steam turbine with high-pressure structure of the Shanghai steam turbine structure