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清华大学学报(自然科学版)  2023, Vol. 63 Issue (1): 71-77    DOI: 10.16511/j.cnki.qhdxxb.2022.26.043
  机械工程 本期目录 | 过刊浏览 | 高级检索 |
盾构主驱动密封性能流固耦合仿真
项冲1, 龙伟漾2, 郭飞1, 张新异2, 蒋杰1
1. 清华大学 机械工程系, 摩擦学国家重点实验室, 北京 100084;
2. 中铁工程装备集团有限公司, 郑州 450000
Fluid-structure interaction simulation of sealing shield main drive seal properties
XIANG Chong1, LONG Weiyang2, GUO Fei1, ZHANG Xinyi2, JIANG Jie1
1. State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China;
2. China Railway Engineering Equipment Group Co., Ltd., Zhengzhou 450000, China
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摘要 该文针对盾构主驱动密封唇口开启,通过反向介质流动实现密封效果的特殊工作原理,建立了一种流固耦合(fluid-structure interaction,FSI)计算方法。该方法基于固体力学有限元计算方法及计算流体动力学(computational fluid dynamics,CFD),通过互相传输变形、压力数据,解决了传统双向FSI在材料超弹性特性、两相流和非Newton流体等复杂计算条件下的不收敛问题,并通过试验验证了该方法的有效性。计算结果表明:初始密封间隙较大时,由于第2道腔室(P2)内油脂压降较大,不会产生回流现象;主驱动密封在设计参数下随着流动逐渐达到稳态且唇形密封不再产生变形时,第1道腔室(P1)油脂有向P2回流的趋势,但是最终不产生回流现象,这对密封失效分析具有重要指导意义。该FSI模型及结论为主驱动密封的密封结构性能研究提供了理论基础。
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项冲
龙伟漾
郭飞
张新异
蒋杰
关键词 盾构主驱动密封流固耦合两相流非Newton流体    
Abstract:The shield main drive seal is composed of a labyrinth seal and four lip seals. The use process of the first seal of the shield machine main drive includes multiple stages. The lip seal will be greatly deformed during assembly and pressurization. Therefore, the sealing leakage process is actually a two-way fluid-structure interaction (FSI) process. However, the traditional two-way FSI finite element method must have a continuous flow field because the current dynamic mesh technology cannot solve the problem of the topological filling of the discontinuous flow field. In the initial interference assembly condition of the shield main drive seal, the seal flow fields are independent of each other, which makes the leakage simulation calculation process extremely complicated. Furthermore, the deformation process of the main drive seal under the fluid pressure difference not only involves a flow field calculation under large deformation but also includes complex calculation conditions such as the hyperelasticity of the main drive seal, two-phase flow, and non-Newtonian fluids. To analyze the leakage characteristics of the shield main drive sealing system, an FSI calculation method is established. The method is based on Abaqus and Fluent, and it can solve complex calculation conditions such as the hyperelasticity of the main drive seal, two-phase flow, and non-Newtonian fluids. First, the method calculated the assembly process of the sealing ring by Abaqus and given the initial boundary pressure on both sides of the sealing ring to make the clearance slightly open, which is the precondition for calculating the flow field. Second, we extracted the deformed solid model and rebuild the model. Then, the deformed model was used to calculate the flow field in Fluent, and when the flow field reaches a steady state, the fluid pressure on both sides of the sealing ring was collected. Because the grease flows slowly, the dynamic pressure and static pressure differ by an order of magnitude, so the calculation used static pressure in this paper. Then, the flow field pressure was transferred to the solid model, and the deformation of the seal ring was recalculated by Abaqus. Finally, the above calculation process was repeated until the calculation results of the two models converge. The shield main drive sealing experimental system is built, and the effectiveness of the method is experimentally verified. Through the calculation and analysis, it is concluded that when the initial sealing gap is large, the backflow will not produce because of the large pressure drop of the grease in the second chamber. Under the design parameters, the flow gradually reaches a steady state, and the seal is no longer deformed. The grease in the first chamber tends to flow back to the second chamber, but finally, the backflow phenomenon is not produced. A complete simulation calculation method is proposes for the study field of shield main drive sealing. The FSI model and results provide a theoretical basis and reference for research on the sealing structure performance of the main drive seal.
Key wordsshield main drive seal    fluid-structure interaction    two-phase flow    non-Newtonian fluid
收稿日期: 2022-06-17      出版日期: 2023-01-11
基金资助:郭飞,助理研究员,E-mail:guof2014@tsinghua.edu.cn
引用本文:   
项冲, 龙伟漾, 郭飞, 张新异, 蒋杰. 盾构主驱动密封性能流固耦合仿真[J]. 清华大学学报(自然科学版), 2023, 63(1): 71-77.
XIANG Chong, LONG Weiyang, GUO Fei, ZHANG Xinyi, JIANG Jie. Fluid-structure interaction simulation of sealing shield main drive seal properties. Journal of Tsinghua University(Science and Technology), 2023, 63(1): 71-77.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2022.26.043  或          http://jst.tsinghuajournals.com/CN/Y2023/V63/I1/71
  
  
  
  
  
  
  
  
  
  
  
  
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