核电汽轮机侧齿汽封流动特性的数值研究

Numerical Simulation of Flow Characteristics about Lateral Tooth Steam Seal on the Turbine of Nuclear Power Plant

核电站汽轮机汽封系统的蒸汽泄漏量对电厂经济性有重要影响,采用数值求解方法,用有限体积法对控制方程进行离散,并求解湍流模型的封闭方程组,分析了核电厂汽轮机上不同形式侧齿汽封的流动特性和泄漏情况。结果表明:在不同的进口压力下,单低齿侧齿汽封的泄漏量低于双低齿侧齿汽封的泄漏量,有底齿的双低齿侧齿汽封和单低齿侧齿汽封的泄漏量都略高于没有底齿的。为优化核电厂二回路汽封系统提供了理论参考。

The leakage rate of the turbine steam seal system have an important impact on the economy of the nuclear power plant. Control equations are dissociated by the finite volume method, and the closed turbulence model equations are solved, and the different forms of flow characteristics and leakage condition in lateral tooth seal in turbine of nuclear power plant are analyzed by using numerical methods. The results show that the leakage rate of the lateral tooth steam seal with a single low tooth is less than that of the lateral tooth steam seal with double low teeth under different import pressure. And the leakage rate of the lateral tooth steam seal with a single low tooth or double low teeth and bottom teeth are slightly more than those without bottom teeth. It provides theoretical reference for optimizing the steam system of the second loop on the nuclear power plant.