基于模糊评价的人字槽流体动压指尖密封结构参数灵敏度分析

Structural Parameters Sensitivity Analysis of Hydrodynamic Finger Seal with Herringbone-grooved Rotor Based on Fuzzy Valuation

建立人字槽流体动压指尖密封三维流固耦合分析模型,基于ANSYS-CFX软件计算密封的泄漏率和气膜承载力。采用正交试验方法确定密封性能仿真试验方案,针对多指标正交仿真试验结果,采用模糊评价方法建立人字槽流体动压指尖密封性能指标的满意度函数,并运用模糊向量单值化法形成多指标综合满意度。根据综合满意度进行直观分析,得到人字槽流体动压指尖密封结构参数对其性能影响的灵敏程度。结果表明,指尖梁宽度角、动压靴轴向长度和密封片厚度对密封性能影响较大,在结构优化设计中应优先考虑。

Three dimensional solid-fluid interaction numerical analysis model of hydrodynamic finger seal with herringbone-grooved rotor was established. The leakage and load carrying capacity of the seal were calculated by using the software ANSYS-CFX. The performance simulation experiments of hydrodynamic finger seal with herringbone-grooved rotor were designed by the orthogonal method. The contentment degree functions of the seal performance were presented by fuzzy analysis. The multi-index synthesis contentment degree was calculated by the method of uniformization of fuzzy vector. According to the directly analysis method for multi-index synthesis contentment degree, the structural parameters sensitivity to the performance of hydrodynamic finger seal with herringbone-grooved rotor was obtained. It is concluded that the finger stick width angel, the pad length in axial direction and the thickness of finger slice will influence the performance of the seal greatly. These three parameters should be considered firstly in optimization design of hydrodynamic finger seal with herringbone-grooved rotor.