叶片正面 meaning in English

blade face
face of blade
pressure side of the blade
thrust face

Based on the comparison made among the characteristics of different kinds of the blade materials , the relationship between the material characters and the flow attack angle is explained , and then the breakage mechanism of the combined effects from both the clearance - cavitations and the erosion of leakage flow are expounded comprehensively
通过对不同材料的特性比较，解释了材料特性与冲角之间的关系，综合阐述了泄漏流动所引起叶片正面头部空蚀与磨损联合作用产生破坏的机理。