浸液式核主泵惰转飞轮间隙流道力热综合优化设计方法

第三代核主泵为避免叶轮转轴与主管道动密封间的放射性液体泄漏，用定子壳体和主管道将主泵转子封装为浸液转子；转子上用于提供断电惰转动能的大惯量飞轮，充液腔隙上端衔接高温一回路，下端联通低温水润滑轴承；飞轮带动间隙液体旋转产生显著流体阻力、能耗及传热效应，给核主泵的有效惰转输出、稳态运行效率及内部温差控制都带来严峻挑战。拟先通过复合湍流模拟揭示高雷诺数间隙环流动量输运机理及阻力特性；探索飞轮盘面/柱面间隙流动阻力转矩分解测试方法；构建等温条件下盘面/柱面间隙环流无量纲阻力矩和附加轴向力与流动雷诺数及无量纲间隙宽度的数学模型；再研究半封闭腔室基于泰勒涡的间隙环流轴向传热机理，探索间隙环流在生热耦合条件下轴向传热系数实验测试方法。最后基于间隙环流阻力、生热、传热特性与粘温效应，综合间隙环流泰勒涡、定转子传导、流固对流换热建立飞轮等效热阻网络模型，形成面向力能温度协同控制的飞轮结构与流道优化设计方法。

In third generation nuclear power plant, the coolant in primary loop is conducted into the annular gap between rotor and stator of reactor coolant pump (RCP), to avoid the leakage of radioactive coolant by means of substituting the dynamic sealing between the impeller shaft and the primary loop with static sealing between the motor shell and the primary loop, however bringing with additional force and viscous dissipation effects at the same time. To improve the efficiency of RCP on the basis of safe running, the optimal design of flywheel and annular gap parameters is essential. Since the heat transfer from the upper disc cavity next to the primary loop with high temperature to the bottom close to the journal bearing is accompanied with strong viscous-heating, the control of temperature distribution in the upper-flywheel annular gap faces great challenge. With the aim to establish the prediction model of torque resistance and additional axial force as well as heat-transfer coefficient in disk and cylindrical annular flow, respectively, the scaled-model of numerical simulations and experimental tests on the flow and heat-transfer in the annular gap around flywheel are to be conducted with iso-thermal condition based on the similarity criterion. According to the heat-transfer characteristics around flywheel, an equivalent thermal resistance network will be established to obtain the algebraic governing equations on temperature distribution, based on those torque resistance and heat-transfer coefficient models. Then, the temperature distributions around the flywheel are reconstructed from the governing equations by iterating to consider the effects of temperature on fluid viscosity. Constrained with rotational inertia and the boundary condition of top and bottom temperature, the optimal design with flywheel parameters will be developed.