核主泵密封的多物理场分析

发布时间：2018-05-12 05:12

本文选题：核主泵（NRCP） + 机械密封　；参考：《西华大学》2014年硕士论文

【摘要】：核主泵流体静压型机械密封具有收敛的密封间隙，在实际工况中，动、静环端面之间形成一层微米级的介质膜，此为密封副的泄漏源，对其进行控制，能很好的控制其泄漏量。另一方面，介质膜对密封副起润滑和冷却的作用，有利于密封环长时间工作而不被磨损，且具有良好的稳定性。运用流体力学相关理论，建立了核主泵机械密封间隙流场的计算模型，并在考虑介质压力差及离心力作用的情况下，建立了机械密封端面间的泄漏量计算公式，分析了密封端面结构参数和操作参数对密封性能的影响。研究结果表明，密封端面锥角和转折半径均对密封泄漏量有显著影响，离心力对泄漏起阻碍作用。基于流体力学基本理论和传热学，分析核主泵流体静压型机械密封的连续性方程、动量方程、能量方程及粘温方程，，以及它们相应的边界条件；基于哈密顿原理及热流势最小作用原理，在双向流-固耦合的基础上，建立核主泵流体静压型机械密封流-固-热耦合场的数值分析模型。基于以往的流-固双向耦合方法，在结构分析中进行Command处理，改变单元的结构及输入输出项，使其能同时接收流场分析中的压力及温度载荷；把结构分析中的位移及热流量传递到流场分析中，在ANSYS Workbench上实现多物理场耦合分析。以核主泵机械密封组件为研究对象，对其进行流-固-热耦合分析，研究了密封间隙的压力分布和密封环的应力分布、温度分布及位移变形。本文使用的流-固-热耦合模型综合考虑了密封组件之间的预紧力及热传导作用等，能够真实反映流体和密封结构之间的相互影响。
[Abstract]:The hydrostatic mechanical seal of nuclear main pump has convergent seal clearance. In the actual working condition, a layer of micrometer dielectric film is formed between the moving and static ring end surfaces, which is the leakage source of sealing pair. The leakage amount can be controlled well by controlling it. On the other hand, the medium film can lubricate and cool the seal pair, which is beneficial to the sealing ring working for a long time without being worn out, and has good stability. Based on the relevant theory of fluid mechanics, the calculation model of the clearance flow field of the mechanical seal of the nuclear main pump is established, and the formula for calculating the leakage between the end surfaces of the mechanical seal is established considering the pressure difference of the medium and the centrifugal force. The effects of structural parameters and operating parameters on seal performance are analyzed. The results show that the cone angle and turning radius of the seal face have a significant effect on the leakage rate of the seal, and the centrifugal force hinders the leakage. Based on the basic theory of fluid mechanics and heat transfer, the continuity equation, momentum equation, energy equation and visco-temperature equation of hydrostatic mechanical seal of nuclear main pump are analyzed, and their corresponding boundary conditions are analyzed. Based on the Hamiltonian principle and the principle of minimum heat flux potential, the numerical analysis model of hydrostatic mechanical seal fluid-solid-heat coupling field of nuclear main pump is established on the basis of two-way fluid-solid coupling. Based on the previous fluid-solid bidirectional coupling method, Command is used in the structural analysis to change the structure of the unit and the input and output terms, so that it can simultaneously receive the pressure and temperature load in the flow field analysis. The displacement and heat flux in the structure analysis are transferred to the flow field analysis, and the multi-physical field coupling analysis is realized on ANSYS Workbench. Taking the mechanical seal assembly of the nuclear main pump as the research object, the pressure distribution of the seal clearance and the stress distribution, temperature distribution and displacement deformation of the seal ring are studied by fluid-solid-heat coupling analysis. The fluid-solid-heat coupling model used in this paper takes into account the pretightening force and heat conduction between the sealing components, which can truly reflect the interaction between the fluid and the sealing structure.
【学位授予单位】：西华大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TH136

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