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考虑核电站汽轮机所具有的水膜闪蒸和水膜与壁面换热后，核电汽轮机动态模型和常规火电机组的差别仅在于容积方程。研究表明，两者的差别在于核电汽轮机动态模型中的容积方程增加了水膜蓄热和壁面蓄热两项传递函数。文中给出了核电汽轮机的容积方程。
Considering the flashover of the water film and the heat exchange between the water film and the wall in the steam turbine of a nuclear power plant, the difference between the dynamic model of the nuclear steam turbine and the conventional thermal power unit lies only in the volumetric equation. The research shows that the difference between the two is that the volumetric equation in the dynamic model of nuclear power turbine increases the two transfer functions of water film thermal storage and wall thermal storage. The paper gives the volume equation of nuclear power turbine.