Based on 100MW solar thermal steam turbine,618mm low pressure last stage blade was developed.Combined with the characteristics of frequent operating conditions and low load operation,the basic idea,blade profile design and structure design of last stage blade of solar thermal steam turbine are summarized and put forward.The analysis of finite element numerical calculation method shows that the root reaction degree of 618mm blade is high,and a small amount of negative reaction degree occurs until 30%load,and the performance of variable working conditions is good.It has low dynamic stress characteristics under low-flow extreme working conditions,which can ensure the economy and safety of variable working conditions and low-load operation,and provides useful guidance for the development of solar thermal steam turbines.
aast stage bladessolar thermal steam turbinevariable working conditionslow-load
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