摘要
基于多重参考系下的雷诺时均N-S方程和RNGk-ε湍流模型,对核主泵导叶在不同周向位置缩比模型的内部流动进行全三维非定常数值计算.分析导叶周向位置对核主泵叶轮径向力的影响,基于数值计算结果表明:导叶位置变化对核主泵能量性能有明显的影响,扬程、效率的最大变化率分别为2.47%、1.52%,扬程和效率的最大值均出现在导叶周向位置角为5°时,说明此时核主泵性能最优;在设计工况下随着导叶周向位置的变化作用在叶轮上的径向力随时间呈周期波动,径向力脉动频率以叶片通过频率为主,其中导叶周向位置在5°时径向力分布比较集中,有利于核主泵的安全运行;导叶处于最佳周向位置时随着流量的变化作用在叶轮上的径向力先减小后增大.在非设计工况下,作用在叶轮上的径向力分布随机性较强,故在设计工况下可以降低核主泵在运行过程中的振动.
Based on the Reynolds time average equation in multiple reference frame and the RNG k-ε tur bulent mode, the full three dimensional unsteady numerical calculation is conducted for the internal flow in a proportionally shrunk model of nuclear main pump with differently disposed circumferential position of vaned diffuser. The influence of circumferential position of the diffuser on impeller radial force of the nu clear main pump is analyzed. The numerical calculation result shows that thediffuser＇s circumferentialpo sition change will have a remarkable effect on the energy performance of nuclear main pump, the maxi mum change rate of pump head will be 2.47°, the maximum change rate of the efficiency will be 1.52%, and they will appear at 5° of diffuser＇s position, illustrating that when circumferential position of guide vane is 5°, the nuclear main pump will have optimal performance. Under design working conditions and with the change of circumferential position of the diffuser, the radial force on the impeller will periodically oscillate basically with the passing frequency of the impeller blade. Meantime, when the guide vane posi tion is 5°, the distribution of the radial force will be of concentrated form that benefiting to the safe opera tion of the nuclear main pump. When the guide vane is at its optimal circumferential position, the impeller radial force will decrease at first and then increase with the change of the flow rale. And under of Ldesign working condi tions, however, the distribution of the radial force on the impeller will have a stronger randomness, Therefore, under design working conditions, the vibration of nuclear main pump during its operation can be alleviated.
作者
程效锐
许彪
叶小婷
刘贺
CHENG Xiao-rui;XU Biao;YE Xiao-ting;LIU He(College of Energy and Power Engineering,Lanzhou Univ.of Tech.,Lanzhou 730050,China;Key Laboratory of Fluid Machinery and Systems of Gansu Province,Lanzhou Univ.of Tech.,Lanzhou 730050,China)
出处
《兰州理工大学学报》
CAS
北大核心
2018年第4期52-59,共8页
Journal of Lanzhou University of Technology
基金
国家自然科学基金(51469013)
关键词
核主泵
周向位置
径向力
数值模拟
nuclear main pump
circumferential position
radial force
numerical simulation
