ISSN   1004-0595

CN  62-1224/O4

高级检索

机械密封动环外周表面织构换热机理及结构优化

Heat Transfer Mechanism and Optimization of Circumferential Texture of Mechanical Seal

  • 摘要: 本文中以接触式机械密封为研究对象,考虑端面摩擦热,建立了包含密封环及密封腔的三维轴对称传热模型,并采用Fluent软件进行了传热分析,得到了密封环及密封腔的流场、温度场、速度场和Nusselt Number(Nu数)分布情况. 通过分析织构及其周边的流场、流态和温度场,揭示了织构的对流换热机理,主要研究了等边三角形织构的深径比、排数、排间距、排列方式和方向角等几何因素对端面温度的影响,并对等边三角形的结构参数进行了优选. 结果表明:动环外周表面织构具有增强对流换热效果和降低密封环整体温度的能力;织构的型式、深径比、个数以及排列方式均会对其换热效果产生影响,其中织构个数和旋转角影响较大,且三角形织构具有较强的换热能力,为今后高性能机械密封的优化设计及应用提供了理论依据.

     

    Abstract: In this paper, the contact mechanical seal was taken as the research object. Considering the friction heat of the end face, a three-dimensional axisymmetric heat transfer model including the sealing ring and the seal chamber was established. The heat transfer analysis was carried out by Fluent software. The flow field, temperature field, velocity field and Nusselt Number (Nu) distribution of the sealing ring and the seal chamber were obtained. By analyzing the flow field, flow pattern and temperature field of the texture and its surroundings, the convective heat transfer mechanism of the texture was revealed. The influence of geometric factors such as depth-to-diameter ratio, row number, row spacing, arrangement and direction angle of the equilateral triangle texture on the temperature of the end face were studied, and the structural parameters of the equilateral triangle were optimized. The results showed that the texture of outer circumferential surface of the rotating ring enhanced the convective heat transfer and reduce the overall temperature of the sealing ring. The type, depth-to-diameter ratio, number and arrangement of the texture affected the heat transfer effect, among which the number of textures and the rotation angle had a great influence, and the triangular texture had a strong heat transfer ability, which provided a theoretical basis for the optimization design and application of high performance mechanical seals in the future.

     

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