为研究水力机械过流部件表面粗糙度对离心泵性能的影响机理，利用ANSYS CFX软件在0.4Qd、0.6Qd、0.8Qd、和1.0Qd工况下5组不同的粗糙度时进行离心泵流场数值模拟。研究表明：进口压力为25.019 kPa和工况为0.4Qd时，粗糙度对同一监测点的影响程度最大；在粗糙度Ra=12.5～36.27 μm时，可减少轴向速度的减小速率；在粗糙度Ra=0～12.5 μm时，粗糙度有一定的减阻作用，且可以降低回流漩涡强度，使速度趋于均匀化，同时改善空化性能，在Ra=6.3 μm时的抗空化效果最好。

In order to explore the influence of the surface roughness of the wetted parts of hydraulic machinery on the performance of centrifugal pumps,numerical simulation calculations were carried out under 0.4Qd,0.6Qd,0.8Qd,and 1.0Qd conditions and with five different sets of roughness by using ANSYS CFX software.Conclusions were drawn: when the inlet pressure was 25.019 kPa and the working condition was 0.4Qd,the roughness had the greatest influence on the same monitoring point.When the roughness Ra was 12.5 μm to 36.27 μm,the rate of decrease of the axial velocity could be reduced.When the roughness Ra was 0 μm to 12.5 μm,the roughness had a certain drag reducing effect,and the back flow vortex intensity could be reduced,the speeds tend to be uniform,and the cavitation performance was improved,with the best anticavitation effect at Ra=6.3 μm.

TH311

四川省科技厅项目（2016JY0187）；四川省教育厅重大培育项目 （14CZ0013）