摘要
Abstract
The tubular centrifuge is taken as the research object,and based on the numerical simulation method of fluid-structure interaction,mainly focuses on the simulation research of two aspects of the tubular centrifuge:one is the study of flow field characteristics,the other hand,there is research on rotordynamics issues.In these two aspects of research,five working speeds(12 000,13 000,14 000,15 000,and 16 000 r/min)are selected for analysis.In the first aspect,the main research content is the pressure distribution and phase distribution of the flow field.The Mixture multiphase flow model and RNG k-ε turbulence model are used for steady-state analysis.The final maximum pressure value of the flow field is positively correlated with the working speed,which is 1.85,2.14,2.44,2.76,and 3.10 MPa,respectively.The function relationship between speed and maximum pressure is further fitted by a quadratic polynomial.The second aspect mainly focuses on the strength and critical speed of the rotor structure.In the strength analysis,the structural strength using 316 stainless steel as the main material is verified,and the results show that it meets the strength requirements.In the critical speed analysis,the pre stress modal analysis method is used to calculate the first six natural frequencies of the rotor structure at different operating speeds.It is found that the critical speed is 13 172.175 r/min,and the critical speed is closed to the third natural frequency:219.104,219.471,219.850,220.245,and 220.658 Hz.The numerical simulation model and research results established have certain reference value and guiding significance for the design and practical application of tubular centrifuges.关键词
离心分离/流固耦合/Mixture多相流模型/强度分析/临界转速Key words
centrifugal separation/fluid-structure interaction/Mixture multiphase flow model/strength analysis/critical speed分类
机械制造
