瞬变工况下叶片数对核主泵径向力影响的研究

Effect of number of blades on reactor coolant pump radial force under variable flow transition conditions

为研究核主泵在变流量过渡过程中叶片数与导叶片数对径向力的影响,应用计算流体力学软件CFX对核主泵分别改变叶片数与导叶片数时,叶轮与导叶所承受的径向力变化规律进行数值模拟计算与试验,将数值模拟结果与试验进行验证,试验数据与数值模拟数据在误差控制范围之内。结果表明:变叶片数时,随着流量增大,核主泵叶轮所承受的径向力值随叶片数的增加而增大,在叶片数为7片时达到最大值,叶轮所承受的径向力的周期性趋于规律性;径向力的平衡性趋于最佳工况。随流量变小时,叶轮所承受的径向力位置随旋转周期有规律性地偏移和旋转,其偏移和旋转的变化梯度不同,叶轮所承受的径向力偏移和旋转的变化梯度明显大于向大流量增加时所对应的变化梯度。通过综合对比可知:在变流量过程中,当叶片数为5片、导叶片为11片时,叶轮承受的径向力是最小。

To study the effect of number of blades and guide vanes on a reactor coolant pump’s radial force under variable flow transition conditions,the computational fluid dynamics software CFX was applied in the numerical simulation and test for the radial force variation law with number of blades or guide vanes changed.Compared the numerical simulation results with the experimental ones,both of them were within the error control range.The results showed that with flow rate increasing,the radial force of the reactor coolant pump impeller increases with increase in number of blades,and reaches the maximum value with the blade number of 7,the periodicity of the radial force tends to regularity, the radial force balance tends to the optimum working condition;with flow rate decreasing,the position of the impeller radial force offsets and rotates regularly in its rotating cycle,and the variation gradients of offset and rotation are different;the variation gradients of the impeller radial force offset and rotation are obviously greater than those corresponding to a larger flow increasing.Through the comprehensive comparison,it was shown that when the number of blades is five and the guide vanes is 11,the radial force on the impeller is the minimum.