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从机组功率和涡轮效率观点来看,汽轮机末级叶片是一个关键的部件,因为末级提供的功率往往占整个汽轮机输出功率的10%左右或更多,末级叶片出口的环状面积决定了最大的蒸汽流量。排汽面积也决定了排汽损失值,该损失对装置效率有很大影响。为此,为了增加机组的功率并提高汽轮机装置的热效率必须研制具有大的排气面积和高效率的末级叶片。众所周知,无论是常规动力还是核动力的大功率汽轮机由于巨大的蒸汽流量和蒸汽经多级膨胀,其末级叶片往往是在跨音速区
From the standpoint of unit power and turbine efficiency, the last stage of the turbine blade is a critical component because the power supplied by the final stage tends to account for about 10% or more of the total turbine output power and the annular area at the exit of the final stage blades determines Maximum steam flow. The exhaust area also determines the value of exhaust loss, which has a significant impact on plant efficiency. For this reason, it is necessary to develop a final stage blade having a large exhaust area and high efficiency in order to increase the power of the generating unit and improve the thermal efficiency of the steam turbine unit. As we all know, whether it is conventional or nuclear power turbine due to huge steam flow and steam through the multi-stage expansion, the last stage of the blade is often in the transonic zone