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在湿蒸汽汽轮机设计中评估湿蒸汽偏离热力学平衡态的程度及其对透平级几何、气动参数设计的影响具有重要意义。本文发展了湿蒸汽非平衡凝结流动的流线曲率法通流设计程序,对某300 MW汽轮机低压缸六级透平内的流动进行了分析,并与平衡凝结流动流线曲率法程序的计算结果进行了对比。结果表明:与平衡凝结流动相比,非平衡凝结流动中叶栅后的压力、出口汽流角、湿度以及级的反动度和效率发生了明显变化,非平衡凝结流动的效率降低2 08%,功率降低1.05 MW。本文发展的非平衡凝结流动流线曲率法通流设计程序为我国大功率火电汽轮机低压缸和核电汽轮机的通流设计提供了工具。
It is of great importance to assess the extent to which wet steam deviates from the thermodynamic equilibrium state in wet steam turbine design and its effect on geometry and aerodynamic parameters of the turbine stage. In this paper, the flow-through curvature design method of non-equilibrium condensation flow in wet steam is developed. The flow in a six-stage turbine with a low-pressure cylinder of a 300 MW steam turbine is analyzed and compared with the results of the flow curvature method in a balanced condensing flow Contrast. The results show that the pressure, the exit steam flow angle, the humidity and the reaction and efficiency of the cascade flow change obviously in the unbalanced coagulation flow compared with that of the balanced coagulation flow. The efficiency of the non-equilibrium coagulation flow decreases by 208% and the power Reduce 1.05 MW. The non-equilibrium condensing flow streamline curvature flow-through design procedure developed in this paper provides a tool for the design of the through-flow of low-pressure and nuclear-powered turbines for high-power thermal power turbines in China.