ISSN   1004-0595

CN  62-1095/O4

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王衍, 葛云路, 黄国庆, 胡琼, 肖业祥, 胡鹏. 干气密封旋转流场的宏观特性与介观速度场的逻辑关系研究[J]. 摩擦学学报, 2020, 40(3): 364-377. DOI: 10.16078/j.tribology.2019189
引用本文: 王衍, 葛云路, 黄国庆, 胡琼, 肖业祥, 胡鹏. 干气密封旋转流场的宏观特性与介观速度场的逻辑关系研究[J]. 摩擦学学报, 2020, 40(3): 364-377. DOI: 10.16078/j.tribology.2019189
WANG Yan, GE Yunlu, HUANG Guoqing, HU Qiong, XIAO Yexiang, HU Peng. The Logic Relationship between Macroscopic Characteristics and Mesoscopic Velocity Field of High-Speed Rotating Flow Field of Dry Gas Seal[J]. TRIBOLOGY, 2020, 40(3): 364-377. DOI: 10.16078/j.tribology.2019189
Citation: WANG Yan, GE Yunlu, HUANG Guoqing, HU Qiong, XIAO Yexiang, HU Peng. The Logic Relationship between Macroscopic Characteristics and Mesoscopic Velocity Field of High-Speed Rotating Flow Field of Dry Gas Seal[J]. TRIBOLOGY, 2020, 40(3): 364-377. DOI: 10.16078/j.tribology.2019189

干气密封旋转流场的宏观特性与介观速度场的逻辑关系研究

The Logic Relationship between Macroscopic Characteristics and Mesoscopic Velocity Field of High-Speed Rotating Flow Field of Dry Gas Seal

  • 摘要: 旋转流场中的流体流动比较复杂,特别是在高转速、微尺度工况时,流场中的流体流态及其判断方法缺乏完备的理论模型. 选择干气密封作为高速旋转流场的研究对象,以开启力和泄漏量作为宏观特性表征指标参数,选择剪切(周向)、径向及轴向速度分量对速度流场进行介观表述,通过Fluent软件仿真计算大跨距转速(低转速至超高转速)时的宏观、介观指标参数,研究密封性能指标参数与速度场间的内在逻辑关系. 结果表明:低速旋转流场中的轴向速度分量较小,可忽略不计,转速升高会促使轴向速度分量持续增大,当转速持续增大并超过某一临界值时,轴向速度分量会出现迅速升高的情形;轴向速度分量的变化情形与微尺度流场(开启力和泄漏量)波动密切相关,是影响旋转流场流态的关键性指标参数,也是引起宏观流场特性变化的主要因素;径向速度分量的变化情形与微尺度流场泄漏量的变化规律基本一致,随着转速的增大,泄漏量的宏观性能反馈要早于开启力波动的出现. 基于以上研究,同时根据管道雷诺数、流量因子判定模型及流体力学基本理论,尝试提出了基于三维速度分量的针对旋转流场流态的椭球判定模型.

     

    Abstract: Because of the complex fluid flow in the rotating flow field, especially under the high speed and micro scale conditions, the fluid flow state and its judgment methods were lack of a complete theoretical model. This paper chose the dry gas seal as the research object of high speed rotating flow field, with its opening force and leakage rate as index parameters of macroscopic property characterization. The shear (circumferential), radial and axial velocity components were used to give mesoscopic description of the velocity field. Fluent software was used to simulate and calculate the macro and mesoscopic parameters of large-span rotation speed (from low to ultra-high rotational speed), and the internal logical relationship between sealing performance parameters and velocity field was studied. The results showed that the axial velocity component in the low-speed rotational flow field was small and negligible, but the increase of rotation speed caused the axial velocity component to increase continuously. And when the rotational speed increased and exceeded a critical value, the axial velocity component increased rapidly. The variation of the axial velocity component was closely related to the fluctuation of the micro-scale flow field (the opening force and leakage). It is a key parameter that affected the flow pattern of rotating flow field and a main factor that caused the change of macroscopic flow field characteristics. The variation of the radial velocity component was basically consistent with the variation of the leakage in the microscale flow field. With the increase of the rotation speed, the macroscopic performance feedback of the leakage was earlier than the appearance of the opening force fluctuation. Based on the above research and according to the definition of Reynolds number of pipeline, the flow factor determination model and the basic theory of fluid mechanics, an ellipsoid determination model based on three-dimensional velocity component for the rotational flow field was proposed.

     

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