CAJ | 학술논문

采用三维雷诺平均N-S方程和S-A湍流模型对多种不同叶片安装角的喷水推进轴流泵动叶流场和性能进行数值研究。计算结果表明，增大动叶进、出口安装角可以提高动叶的水力性能；设计工况下，进口安装角增大2°，出口安装角增大6°时动叶的水力性能最优；非设计工况下，动叶进口安装角的增加会增大小流量工况时动叶吸力面的分离区，而出口安装角的增大会拓展动叶大流量工况时高效工作区的范围，并充分发挥动叶做功能力，但在小流量工况下动叶的流动比较紊乱，会产生较大的角区分离。
채용삼유뢰낙평균N-S방정화S-A단류모형대다충불동협편안장각적분수추진축류빙동협류장화성능진행수치연구。계산결과표명，증대동협진、출구안장각가이제고동협적수력성능；설계공황하，진구안장각증대2°，출구안장각증대6°시동협적수력성능최우；비설계공황하，동협진구안장각적증가회증대소류량공황시동협흡력면적분리구，이출구안장각적증대회탁전동협대류량공황시고효공작구적범위，병충분발휘동협주공능력，단재소류량공황하동협적류동비교문란，회산생교대적각구분리。
Three dimensional Reynolds averaged N-S equation and S-A turbulent model were adopted to simulate the flow field and hydraulic performance of the impeller in a waterjet axial-flow pump.Numerical research results show that the hy-draulic performance of the impeller can be improved by in-creasing the inlet and outlet blade stagger angle .In the design condition, the best hydraulic performance of the impeller can be obtained when the inlet and outlet blade stagger angle re-spectively increases 2°and 6°.In off-design condition, the blade suction separation zone increases in low flow rate condi-tion when the inlet blade stagger angle increases .The high ef-ficiency zone of the impeller can be extended by increasing the outlet blade stagger angle in large flow rate condition , and the working capacity of the impeller can also be enhanced .But the flow is relatively disordered in flow rate condition , which results in the larger zone of corner separation .