Numerical Analysis of Characteristics of a Bionic Cluster Spiral Groove Dry Gas Seal
Numerical Analysis of Characteristics of a Bionic Cluster Spiral Groove Dry Gas Seal
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DOI：
10.3901/jme.2015.15.020
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发表时间：
2015
影响因子：
--
通讯作者：
Jin-bo Jiang
中科院分区：
文献类型：
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作者：
Jin-bo Jiang
针对普通单向螺旋槽干气密封在高速运行时工作稳定性差、泄漏量大的问题，基于耦合仿生理论，提出了一种新型仿生簇螺旋槽干气密封。根据气体润滑理论，建立了仿生簇螺旋槽端面的几何模型和数学模型，并进行了一系列仿真，分析了槽宽比、螺旋角、微槽数和台阶槽深比对密封性能的影响，如流体动力开启力增加率、轴向油膜刚度和刚度泄漏比，对仿生簇螺旋槽的主要几何参数进行了优化。结果表明，仿生簇螺旋槽干气密封在高速低压下的密封性能和运行稳定性明显优于普通单向螺旋槽干气密封，流体动压开启力、轴向油膜刚度和刚度泄漏比的增长率均超过20%。结果表明，基于鸟翼的端面槽仿生设计能显著提高普通单向螺旋槽干气密封的工作稳定性，可为工程设计选型提供参考。
： A new type of bionic cluster spiral groove dry gas seal is introduced to solve the problems of poor operation stability and high leakage of common unidirectional spiral groove dry gas seal when it operate at high speed based on the coupling bionic theory. Geometric model and mathematical model of bionic cluster spiral groove face are set up according to the theory of gas lubrication, and a series of simulations are carried out to analyze the influence of groove width ratio, spiral angle, microgroove number and step groove depth ratio on sealing performance, such as increase ratio of hydrodynamic open force, axial film stiffness and stiffness-leakage ratio, the optimization of the main geometric parameters of bionic cluster spiral groove is demonstrated. Numerical results show that sealing performance and operation stability of bionic cluster spiral groove dry gas seal are much better compared to common unidirectional spiral groove dry gas seal at high speed and low pressure, the growing rate of increase ratio of hydrodynamic open force, axial film stiffness and stiffness-leakage ratio are more than 20% in detail. It demonstrates that the bionic design of face groove based on bird wing could significantly improve the operation stability of common unidirectional spiral groove dry gas seal, which can provide a reference for the design and model selection in engineering.