ALIP泵非定常流动特性的三维建模

R. Zhao, Heng Miao, Desheng Zhang, Huang Jun, Xiongfa Gao
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摘要

环形线性感应泵(ALIP)是一种理想的钠冷快堆(SFR)核冷却剂泵。但是,当泵的尺寸增大并在一定的工况下运行时,会出现严重的不稳定问题。本文基于有限元方法,建立了泵流道的三维数值模型,研究了泵流道内的流动不稳定性。结果表明,该模型能较准确地预测不同工作流量下的泵扬程以及双电源波动和低频波动等常见现象。在不稳定条件下的结果表明,泵通道内的液钠会随着外定子位置的变化而发生分离。由于磁场在方位方向上的不均匀性,在两个外定子之间的通道中经常发生反流和涡旋。与此同时,不稳定流动首先出现在管道外表面附近的子午面。最后,在不稳定流区后部出现一波状的流动摆动,导致压力的低频波动。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
3D Modeling of Unsteady Flow Characteristics in ALIP Pump
Annular linear induction pump (ALIP) is an ideal type of pump applied as the nuclear coolant pump for the sodium-cooled faster reactor (SFR). However, the operation will suffer from serious unstable problems when the pump size is increased and run at certain working conditions. A 3d numerical model of an ALIP based on the Finite Element method is built in this work to study the flow instability in the pump channel. The results show that the model can accurately predict the pump head at different working flow rate and some common phenomena, such as double supply fluctuation (DSF) and low frequency fluctuation. The results under unstable condition show that the liquid sodium in pump channel will separate in term of the outer stator position. Reversed flow and vortices always occur in the channel between two outer stators because of the non-uniform magnetic field in the azimuthal direction. Meanwhile the unstable flow is first presented in the meridian plane near the outer duct surface. Finally, a wave-like swing of the flow is presented at the rear of the unstable flow region, resulting in low frequency fluctuation in pressure.
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