固液两相流泵叶轮用Cr26高铬铸铁的冲蚀率模型及影响因素

采用正交试验方法对Cr26高铬铸铁进行了冲蚀试验,基于冲蚀率理论计算模型对试验数据进行多元非线性回归,得到了Cr26高铬铸铁的冲蚀率计算模型并进行了验证;通过试验和模型计算对冲蚀率随其影响因素的变化规律进行了定量描述。结果表明:所建立的Cr26高铬铸铁冲蚀率计算模型具有较高的准确性;冲蚀率随冲蚀角度的增大先增大后减小再略微增大,最大冲蚀率出现在冲蚀角度40°附近,在低冲蚀角度下磨损形式以切削磨损为主,在高冲蚀角度下磨损形式以变形磨损为主;随着固体颗粒粒径的增大,冲蚀率增大,切削磨损占比增大,变形磨损占比减小;随着冲蚀速度的增加,切削磨损占比减小,变形磨损占比增大。

Erosion Rate Model and Influencing Factors of Cr26 High Chromium Cast Iron for Solid-Liquid Two-Phase Flow Pump Impellers

Erosion tests were conducted on Cr26 high chromium cast iron by orthogonal testing method.The erosion rate calculation model of Cr26 high chromium cast iron was obtained by multiple nonlinear regression of testing results on basis of erosion rate theory calculation model,and the accuracy of the model was verified.The rule of erosion rate vs influencing factors was described quantitatively by tests and model calculation.The results show that the erosion rate calculation formula of Cr26 high chromium cast iron had high accuracy.With the increase of erosion angel,the erosion rate increased first,then decreased and finally increased slightly,and reached the maximum value near the erosion angle of 40°.The main wear form was cutting wear at low erosion angle and deformation wear at the high erosion angle.With the increase of solid particle size,the erosion rate increased,the proportion of cutting wear increased,and the proportion of deformation wear decreased.With the erosion velocity increasing,the proportion of cutting wear decreased,and the proportion of deformation wear increased.