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基于冠状成核机理,建立了湿蒸汽两相非均质凝结流动数值模型,对缩放喷管、汽轮机叶栅和汽轮机级内湿蒸汽两相非均质凝结流动进行了数值模拟.结果表明:与自发凝结相比,非均质凝结流动中杂质颗粒改变了凝结过程;杂质颗粒减小了喷管中凝结激波强度,改变了汽轮机叶栅中的压力分布,降低了蒸汽过冷度,减少了不平衡热力学损失;在汽轮机级内,非均质凝结流动的动、静叶进、出口汽流角接近过热蒸汽流动的动、静叶进、出口汽流角,其动叶前压力高于过热蒸汽的动叶前压力,但级反动度偏离过热蒸汽流动数值.
Based on the coronal nucleation mechanism, a numerical model of two-phase heterogeneous condensate flow in wet steam is established to simulate the two-phase heterogeneous condensate flow of scaled nozzles, steam turbine cascades and steam turbines. The results show that Compared with spontaneous condensation, the impurity particles in the heterogeneous condensation flow change the condensation process. The impurity particles reduce the condensation shock intensity in the nozzle, change the pressure distribution in the turbine cascade, reduce the supercooling degree of the steam and reduce Unbalanced thermodynamic loss. At the steam turbine stage, the inlet and outlet steam flow angles of the inlet and outlet of the inhomogeneous condensing flow are close to the inlet and outlet steam flow angles of the inlet and outlet of the inlet and outlet of the superheated steam, Steam pre-lobe pressure, but the level of reaction deviation from the superheated steam flow value.