离心叶轮回转流面流动数值计算方法研究-流体机械及工程专业论文.docxVIP

”肃T业大学硕士毕业论文 ”肃T业大学硕士毕业论文 AbSttact Abstract This paper is supported by Natural Science Foundation of Gansu Province． Based on the analysis of many numerical computation methods applied to revolutionary Sl stream surface in the paper，it is discovered that the indirect boandary element methodI(singularity method)is not perfected，and the finite difference method in body fitted coordinate(BFC) has not been adopted to analyze the ideal fluid flow on revolutionary Sl stream in centrifugal pump impellers．Therefore，the indirect boundary element method and the finite difference method in BFC are applied to comprehensively research the flow on revolutionary Sl stream surface in centrifugal impellers，and the following results ale obtained： (1)The indirect b0咖幽fy element method is modifled，and the stream function equations corresponding to the method a∞derived．and the ideal fluid flow on revolutionary Sl stream surface in a centrifugal compressor impeller is analyzed． (2)The stream function equations corresponding to the finite difference method in BFC黜derived,and the ideal fluid flow on revolutionary SI stream surface in centrifugal compressor and centrifugal pump impellers is analyzed． (3)The thickness of stream surface sheet has large influence on the results． (4)Based on comparison the results computed by other numerical methods and test data with the results of the paper，the finite difference meth6d in BFC is eorreet，and the results are also exact,and it Call be used to analyze the flow on revolutionary S．stream surface．The indirect boundary element method is needed to improve in future． Keywords：centrifugal impeller revolutionary Sl stream surface CFD Ir肃工业大学硕士毕业论文 Ir肃工业大学硕士毕业论文 第一章绪论 第一章绪论 1．1前言 随着叶轮机械向大功率、高速、高效率等方向的发展，传统 的一元、二元设计计算方法已逐渐被准三元和完全三元流动的设 计计算方法所代替。采用三元流动的计算方法于设计和校和已成 为叶轮设计的一个必要步骤。为了提高设计的精确性和缩短设计 周期．对叶轮流道内复杂的流场进行数值计算分析是一种经济和 有效的方法。 叶轮内流体的流动是十分复杂的，实际的流动是非定常的、 三维的、可压缩的粘性流动，因此用解析的方法求解是不可能的。 用