| 三自由度微扰下箔片端面气膜密封动态特性分析 |
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| 引用本文： | 王庆港,陈源,彭旭东,李运堂,李孝禄,王冰清,金杰.三自由度微扰下箔片端面气膜密封动态特性分析[J].中国机械工程,2022,33(15):1828-1840. |
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| 作者姓名： | 王庆港 陈源 彭旭东 李运堂 李孝禄 王冰清 金杰 |
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| 作者单位： | 1.中国计量大学机电工程学院，杭州，310018
2.浙江省智能制造质量大数据溯源与应用重点实验室，杭州，310018
3.浙江工业大学机械工程学院，杭州，310032 |
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| 基金项目： | 国家自然科学基金（51905513，52005470）；浙江省高校基本科研业务费专项资金（2021YW77）；浙江省博士后科学基金（ZJ2020084） |
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| 摘 要： | 提出一种新型箔片端面气膜密封方式，基于气体润滑与弹性力学理论，应用小扰动法建立箔片端面气膜密封的微扰膜压控制方程。对比分析了不同箔片变形力学模型下的动态特性系数变化规律，探究了不同工况及结构参数对气膜动态特性的影响规律，以最大动态主刚度和阻尼作为综合优化目标，确定了结构参数的优选范围。结果表明：随着激振频率、转轴转速的提高，气膜动态主刚度与动态主阻尼的动态互补变化，抑制了润滑膜厚的激变，同时作为气膜不稳定诱因的动态交叉系数的变化放缓，降低了因工况突变引起气膜振荡、失稳的风险；此外，介质压力的增大能够显著提升密封维稳、抗振性能。当楔形高度取5～8 μm，节距比取0.2～0.4，箔坝比取0.5～1.1，箔片数取4～6，箔片结构阻尼取5×107～8×107 Pa·s/m时，箔片端面气膜密封综合动态抗扰性能较优。
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| 关 键 词： | 箔片端面气膜密封 小扰动法 动态特性 参数优化 |
Analysis on Dynamic Characteristics of Compliant Foil Face Gas Seals with Three Degrees of Freedom Perturbation |
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| Affiliation: | 1.College of Mechanical and Electrical Engineering，China Jiliang University，Hangzhou，310018
2.Key Laboratory of Intelligent Manufacturing Quality Big Data Tracing and Analysis of Zhejiang Province，Hangzhou，310018
3.College of Mechanical Engineering，Zhejiang University of Technology，Hangzhou，310032 |
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| Abstract: | A new type of compliant foil face gas seal was proposed. Based on the theory of gas lubrication and elasticity mechanics， small perturbation method was applied to establish the perturbation film pressure governing equations of compliant foil face gas seals. The variation laws of dynamic characteristic coefficients were compared and analyzed under different foil deformation mechanical models， and the influence laws of different operating and structural parameters on the dynamic characteristics of the gas films were investigated. Taking the maximum dynamic main stiffness and damping as comprehensive optimization objectives， the optimal range of structural parameters was determined. Results show that with the increasing of excitation frequency and rotational speed， the dynamic complementary changes of dynamic main stiffness and dynamic main damping of the gas film suppress the radical change of film thickness， while the change of dynamic cross coefficients of gas film instability causes slows down， which reduces the risk of gas film oscillation and instability caused by the sudden changes of operating conditions. In addition， the increase of medium pressure may significantly improve the seal stability and vibration resistance performance. When the wedge height is in 5～8 μm， the slope ratio is in 0.2～0.4， the foil-dam ratio is in 0.5～1.1， the number of foil is in 4～6， and the structural damping is in 5×107～8×107 Pa·s/m， the comprehensive dynamic immunity performance of compliant foil face gas seal is optimal. |
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| Keywords: | compliant foil face gas seal small perturbation method dynamic characteristic parameter optimizationv |
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