1000 MW核主泵叶轮型线检测方法

为了检测核主泵水力部件数控加工完成后叶片型线的偏离程度,提出了1套水力部件的检测和评定方法.采用逆向工程点云分析软件(PolyWorks)与三维扫描设备相结合,测量叶轮模型叶片与产品叶片进出口压力、吸力面三坐标,同时计算叶片型线偏离的均方根偏差.通过对叶片进出口型线测量数据的统计处理和理论分析,提出叶片进出口型线偏离角度Δβ的计算公式、叶片间叶距角Δφ的偏离公式以及部分叶片型线偏离的修正公式K.结果表明:该方法能够准确有效地检测水力机械叶片型线的分布,保证了各型线有相同的包角.以国内田湾核电站扩建工程5,6号机组以及秦山一期扩建工程方家山核电站主泵叶轮翼型的检测与评定分析为例,经主泵全流量试验验证表明,与数值分析结果相比,主泵流量满足规范偏离设计流量的±2.5%、扬程偏离±1.5%的要求.

Checking method on 1000 MW RCP impeller profile

To check the deviation of profiles of the blade profiles after the numerical processing of parts of RCP hydraulic parts is finished, one set of checking and evaluation methods was proposed. Through adopting a reversal engineering analysis software PolyWorks, together with a three-dimensianal measu-ring machine, three coordinates for pressure and suction at the ingress and egress side of impeller model blades and product blades were measured. At the same time, the root mean square of the deviation of profiles of the blade profiles was calculated. Through statistic and theoretical analysis on the measured data of profiles at the ingress side and egress side of blades, a calculation formula for deviating angle Δβ of profiles at the ingress and egress side of blades, the deviation formula for the angle between blades Δφ, and the modifier formula K for the part of deviation of profiles of blade profiles were proposed. This method can accurately and effectively check the scattering of profiles of hydraulic blade profiles and ensure the same wrap angle for each profile. Based on the checking and evaluation on the airfoil profiles of the impeller of the RCP impeller for Tianwan 5,6 and Fangjiashan Nuclear Plant, full load test has shown that compared with the result of numerical analysis, RCP flow meets the design deviation flow ±2.5% and pump lift deviation±1.5% required by the specification.