流体机械

2017, v.45;No.541(07) 17-21+87

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基于流固耦合的接触式机械密封端面泄漏率的研究
Study on the Fluid-solid Coupled of the Leakage Rate of Seal Face for Contacting Mechanical Seal

张鹏;李双喜;王梁;蔡纪宁;
ZHANG Peng;LI Shuang-xi;WANG Liang;CAI Ji-ning;Beijing University of Chemical Technology;

摘要(Abstract):

由于没有考虑密封环端面变形的影响,采用经验公式计算接触式机械密封端面的泄漏率存在较大的误差。本文考虑了密封端面泄漏率受密封环端面变形的影响,采用ANSYS和MATLAB软件对密封端面泄漏率进行流固耦合数值求解。研究了密封介质压力pi、密封端面压差Δp、弹簧比压psp和密封端面综合粗糙度σ对接触式机械密封泄漏率Q的影响。通过试验,验证了不同密封介质压力下,密封端面泄漏率数值解的正确性。结果表明,考虑密封环端面变形的数值解比经验公式解更接近测量值。密封端面泄漏率随密封端面综合粗糙度和密封端面压差的增大而加速增大,随介质压力的增大而增大,随弹簧比压的增大而减速增大。本文通过对密封端面泄漏率数值求解,分析泄漏率的影响因素,以期为完善接触式机械密封失效机理起到一定的指导意义。
As a result of not considering the influence of seal face deformation,large error will appear while the leakage rate of contacting mechanical seal is calculated by empirical formula.The influence of deformation of seal face was taken in account of and the fluid-solid coupling method was adopted to calculate the leakage rate of seal face by using ANSYS and MATLAB software.The influencing factors of the leakage rate Q of seal face were studied,including pressure of sealed media pi,pressure-difference of seal face Δp,spring pressure psp and comprehensive roughness of seal face σ.Based on experiment,the accuracy of numerical solution was verified under the different sealing medium pressure.The results showed that the errors between numerical solutions and experimental values were smaller than empirical formula solution and experimental values.The leakage rate accelerates with the increase of comprehensive roughness and pressure-difference of seal face,increases with the increase of sealed media and decelerates increasing with the increase of spring pressure.The leakage rate of seal face with numerical method was applied and the influencing factors was analysed,expecting to provide certain guiding significance for competing the theory study of failure analysis on contacting mechanical seal.

关键词(KeyWords): 流固耦合;接触式机械密封;泄漏率;密封端面变形
fluid-solid coupled;contacting mechanical seal;leakage rate;seal face deformation

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基金项目(Foundation): 国家重点基础研究发展计划(973)项目(2012CB026000)

作者(Author): 张鹏;李双喜;王梁;蔡纪宁;
ZHANG Peng;LI Shuang-xi;WANG Liang;CAI Ji-ning;Beijing University of Chemical Technology;

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