Dynamic Performance of Dry Gas Seals and Analysis of Interactions among Its Influencing Factors
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摘要: 在考虑转轴轴向振动的情况下，基于气体润滑和动力学相关理论，建立了微扰膜压控制方程和挠性安装静环运动方程. 研究了介质压力、螺旋角对干气密封动态特性和瞬态响应的影响；定义了膜厚扰动的突变峰和周期峰，并以突变峰或周期峰最小作为动态性能的优化目标，基于完全析因设计法，开展了高参数螺旋槽干气密封动态性能影响因素间的交互作用分析. 研究结果表明：高速条件下，膜厚振动型态受介质压力影响较大，当介质压力较小时，气膜动态阻尼较小，气膜振动初始阶段易发生波幅逐渐衰减的振荡，而当介质压力增大到一定程度时较大的气膜动态阻尼使膜厚振动迅速衰减，振荡现象消失；高速高压条件下，除挠性环质量和弹簧刚度对周期峰的影响存在显著交互作用外，其余各影响因素对突变峰和周期峰均不存在明显的交互作用，可独立开展优化而不牺牲其结果精度.Abstract: The perturbation gas film pressure governing equations and motion equation of spiral groove dry gas seals with flexibly mounted stator, which took the axial vibration of rotor into consideration, were presented based on gas film lubrication and kinetic theories. The influences of sealed pressure and spiral angle on dynamic characteristics and transient responses were researched under the condition of high-speed. It is shown that gas film sharply oscillated along a certain path when the sealed pressure was relatively low. Saltation peak and period peak of gas film thickness disturbance were defined, and their minimum values were considered as the optimization objects of seal dynamic performance. The interactions among spiral angle (typical representative of structure parameters of spiral groove), spring stiffness, secondary seal damping and stator mass were analyzed under high-speed and high-pressure conditions based on the method of full factorial design. The results show that there was an obvious interaction between spring stiffness and stator mass for period peak, and the other factors affecting dynamic performance of dry gas seal systems can be treated as independent variables to be optimized without affecting the precision of the results of seal dynamic performance.
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Keywords:
- high parameters /
- dry gas seal /
- mechanical system /
- dynamic performance /
- interactions
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图 1 FMS结构S-DGS截面图
Figure 1. Schematic cross section of S-DGSs with flexibly mounted stator
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图 4 介质压力对气膜动态特性系数及膜厚扰动峰值的影响
Figure 4. The influence of sealed pressure on dynamic characteristics coefficients and gas film thickness disturbance peaks
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图 5 螺旋角对气膜动态特性系数及膜厚扰动峰值的影响
Figure 5. The influence of spiral angle on dynamic characteristics coefficients and gas film thickness disturbance peaks
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图 6 介质压力对瞬态密封性能的影响
Figure 6. Influence of sealing pressure on transient sealing performance
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图 7 螺旋角对瞬态密封性能的影响
Figure 7. Influence of spiral angle on transient sealing performance
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图 9 螺旋角与弹簧刚度的交互作用分析(Arz=100 μm)
Figure 9. Interactions between spiral angle and spring stiffness (Arz=100 μm)
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图 10 螺旋角与密封圈阻尼的交互作用分析(Arz=100 μm)
Figure 10. Interactions between spiral angle and secondary seal damping (Arz=100 μm)
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图 11 螺旋角与挠性环质量的交互作用分析(Arz=100 μm)
Figure 11. Interactions between spiral angle and stator mass (Arz=100 μm)
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图 12 挠性环质量与弹簧刚度的交互作用分析(Arz=100 μm)
Figure 12. Interactions between stator mass and spring stiffness (Arz=100 μm)
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图 13 挠性环质量与辅助密封圈阻尼的交互作用分析(Arz=100 μm)
Figure 13. Interactions between stator mass and secondary seal damping (Arz=100 μm)
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