混流式核主泵内部复杂流动结构分析

发布时间：2018-06-28 23:23

本文选题：核主泵 + 数值模拟　；参考：《流体机械》2017年10期

【摘要】：以混流式核主泵水力模型为研究对象,基于三维不可压缩流体的N-S方程和RNG k-ε湍流模型,采用流体计算软件ANSYS-Fluent对不同工况下的混流式核主泵水力模型的三维湍流流场进行数值模拟。通过分析不同特征面上的流动状态,构建该泵内的典型时均流谱,为性能优化及内部流动控制提供参考。计算结果表明:高涡量区域主要分布在固体壁面、径向导叶流道以及球型压水室内出液管附近;靠近出液管附近存在旋涡,导致流动损失增加,但随着流量减小,此处的流动情况趋于稳定,旋涡减弱甚至消失;靠近球型压水室出液管段的旋涡及其相近的径向导叶流道内的复杂流动情况与球型压水室出液管的位置有一定关系,因此减小出液管附近的流动损失,对实现混流式核主泵流动控制具有重要意义。
[Abstract]:Based on the N-S equation of three-dimensional incompressible fluid and RNG k- 蔚 turbulence model, the hydraulic model of Francis nuclear main pump is studied. The numerical simulation of three dimensional turbulent flow field of the hydraulic model of Francis nuclear main pump under different working conditions was carried out by using the fluid calculation software ANSYS-Ffluent. By analyzing the flow state on different characteristic surfaces, the typical time-averaged flow spectrum in the pump is constructed, which provides a reference for performance optimization and internal flow control. The results show that the high vorticity region mainly distributes near the solid wall, the diameter guide vane passage and the outlet tube of the spherical water pressure chamber, and there is vortex near the outlet tube, which leads to the increase of the flow loss, but with the decrease of the flow rate. The flow situation here tends to stabilize, the vortex weakens or even disappears, and the vortex near the outlet section of the spherical pressure chamber and the complex flow in its adjacent radial guide vane passage are related to the position of the outlet tube of the spherical chamber. Therefore, it is of great significance to reduce the flow loss near the outlet tube to realize the flow control of the Francis nuclear main pump.
【作者单位】：中核集团中国中原对外工程有限公司;江苏大学;
【分类号】：TH313

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