ISSN   1004-0595

CN  62-1095/O4

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彭旭东, 金杰, 孟祥铠, 江锦波, 赵文静, 李纪云. 汽液两相流机械密封的研究进展[J]. 摩擦学学报, 2019, 39(5): 643-655. DOI: 10.16078/j.tribology.2018093
引用本文: 彭旭东, 金杰, 孟祥铠, 江锦波, 赵文静, 李纪云. 汽液两相流机械密封的研究进展[J]. 摩擦学学报, 2019, 39(5): 643-655. DOI: 10.16078/j.tribology.2018093
PENG Xudong, JIN Jie, MENG Xiangkai, JIANG Jinbo, ZHAO Wenjing, LI Jiyun. Research Progress on the Liquid Face Seal of Vapor-Liquid Two-Phase Flow[J]. TRIBOLOGY, 2019, 39(5): 643-655. DOI: 10.16078/j.tribology.2018093
Citation: PENG Xudong, JIN Jie, MENG Xiangkai, JIANG Jinbo, ZHAO Wenjing, LI Jiyun. Research Progress on the Liquid Face Seal of Vapor-Liquid Two-Phase Flow[J]. TRIBOLOGY, 2019, 39(5): 643-655. DOI: 10.16078/j.tribology.2018093

汽液两相流机械密封的研究进展

Research Progress on the Liquid Face Seal of Vapor-Liquid Two-Phase Flow

  • 摘要: 液体润滑端面机械密封是流程工业用机泵轴端密封的主要形式,且大量应用于航空航天、海洋工程装备和高端制造装备中,实际运行过程中其端面间液体膜常常发生相变,由此产生端面变形、干磨和密封失稳等现象,甚至完全失效,严重影响了有关设备或整个装置的安全可靠与稳定运行,因此开展汽液两相流端面机械密封研究具有重要意义. 本文中综述了近50年来汽液两相端面机械密封的研究现状,归纳出了机械密封的典型热源及其热传播途径,阐述了机械密封的相变原理,总结了端面流体膜参数的测量技术与方法;在试验研究方面,提出机械密封的端面液膜汽化主要与操作工况、几何尺寸和表面形貌或表面织构有关,其中端面液体入口和出口工况、平衡比和端面变形程度等受到关注,但缺少关于端面形貌或织构的深度研究,也缺少端面摩擦副合理配对的系统研究;在理论研究方面,提出了机械密封相变稳定性判据,以及间断沸腾模型、连续沸腾模型和薄膜均相沸腾模型等3种理论模型,比较了3种模型的优缺点并指出其适用范围. 指出建立合理的相变理论模型,实现相变密封的稳定运行,突破相变密封监控关键技术,构建智能型液体润滑机械密封是未来两相流机械密封的研究重点.

     

    Abstract: Liquid face seals are the main form of shaft end seal used in process industry, which are widely applied to aerospace, marine engineering equipment and high-end manufacturing equipment. A phase change may take place as the liquid flows through the seal clearance, which leads to the seal either face deformation, dry friction or even failure. It is of great significance to carry out the research on the liquid face seal of vapor-liquid two-phase flow because phase changes may affect the safe, reliable and stable operation of relevant equipment or even the whole device. This paper summarized the research status of the liquid face seal of vapor-liquid two-phase flow in the past 50 years. Typical heat sources and heat transfer in the seal plates were concluded. The principle of the phase change of liquid face seals was expounded in this paper. The measurement techniques of end-face fluid film parameters were summarized. On experimental research, the influences of the operation condition, geometrical dimensions, surface morphology or surface texture on a phase change to vapor were significant. Attention to inlet and outlet conditions, balance ratio and face deformation was attached, however, not enough to surface morphology, surface texture and friction pairs. On theoretical research, criteria for stability of face seals and three models (Discontinuous Boiling Model, Continuous Boiling Model, Film Homogenous Boiling Model) of analyzing the phase change and of advantages, disadvantages and suitable ranges were presented. It was proposed that establishing a more accurate theoretical model of vaporization of the fluid between the faces of a mechanical seal, realizing the stable operation and breaking through the key monitoring technology of mechanical face seals with a phase change, and building an intelligent liquid face seals were the emphases for research in the future.

     

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