二次水断供核主泵屏蔽电机冷却水瞬态热分析  

Transient Thermal Analysis of Cooling Water of a Canned Motor for the Nuclear Main Pump Under Secondary Water Supply Outage Condition

作　　者：路义萍[1] 艾丽昆[2] 孙海锋 索文旭 LU Yiping;AI Likun;SUN Haifeng;SUO Wenxu(School of Mechanical and Power Engineering,Harbin University of Science and Technology,Harbin 150080,Heilongjiang Province,China;School of Mechanical and Electronic Engineering,Qiqihar University,Qiqihar 161000,Heilongjiang Province,China;Harbin Electric Power Equipment Co.,Ltd.,Harbin 150040,Heilongjiang Province,China)

机构地区：[1]哈尔滨理工大学机械动力工程学院,黑龙江省哈尔滨市150080 [2]齐齐哈尔大学机电工程学院,黑龙江省齐齐哈尔市161000 [3]哈尔滨电气动力装备有限公司,黑龙江省哈尔滨市150040

出　　处：《中国电机工程学报》2024年第14期5756-5763,I0027,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(52101352);黑龙江省省属高等学校基本科研业务费项目(145309104)。

摘　　要：核主泵屏蔽电机在热态极端环境参数额定(简称热态额定)工况下,二次水突然断供(secondary water supply outage,SWSO)300 s时刻,一次下导轴承润滑水温不超过警报温度95℃是产品出厂的重要指标,研究该情况下热流场计算方法及各种参数随时间演变特性对于电机热安全非常重要。首先,以北方工厂冷态环境参数下额定(简称冷态额定)工况该电机SWSO前后稳/瞬态厂内测量入出口试验数据为边界条件,采用有限体积法,进行流场和温度场的流固耦合数值模拟,模拟值与试验值300 s时的误差为5.97%,验证了计算方法准确性。然后,数值反演热态额定工况SWSO一/二次冷却水的温度场随时间变化规律。结果表明:SWSO 300 s内,二次水流速及对流传热系数随时间变化存在特征明显不同的2个阶段,二次水与螺旋槽壁面间对流换热系数h由稳态时7808.06 W/(m^(2)⋅K),13 s内减少到480.07 W/(m^(2)⋅K),随后h变化很小;热态额定参数时,下导轴承润滑水温远低于报警值95℃。为核主泵屏蔽电机轴承润滑水热安全计算提供参考。The lubricating water temperature of the lower guide bearing is not more than 95℃within 300 s of the secondary water supply outage(SWSO)fault under the extreme thermal ambient parameters of the rated(thermal rated)conditions,which is an important index for the product of canned motor for the nuclear main pump.It is very important for the thermal safety of the motor to study the calculation method of the temperature field and the evolution characteristics of various parameters with time.First,the finite volume method is used to carry out the fluid-solid coupling simulation of flow and temperature field,and the boundary conditions are based on the inlet and outlet test data measured in the steady state and transient state of the motor SWSO fault under the cold ambient parameters of the rated(cold rated)conditions in the north factory.The error between the simulated and experimental values is+5.97%at 300 s.The model is proven to be accurate.Then,the transient temperature field of the SWSO under the extreme ambient parameters of the thermal-rated conditions is numerically inverted.The results show that there are two stages in which the characteristics of secondary cooling water flow velocity and convective heat transfer coefficient between secondary water and spiral groove wall variation with time are obviously different within 5 min in the SWSO state.The value of h decreases from 7808.06 W/(m^(2)⋅K)at t=0 s to 480.07 W/(m^(2)⋅K)within 13 s,and then h changes little.When the ambient parameters are extremely high under the rated operating conditions,the lubricating water temperature of the lower guide bearing is much lower than the alarm value of 95℃.It provides a reference for the thermal safety calculation of the bearing lubricating water of the nuclear main pump canned motor.

关 键 词：屏蔽电机 二次水断供故障 瞬态模拟 流固耦合 冷却水温升 有限体积法 

分 类 号：TM346[电气工程—电机]