ISSN   1004-0595

CN  62-1095/O4

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尹露, 张万福, 姜广政, 潘渤, 李春. 超临界二氧化碳高低齿梳齿密封动力稳定性研究[J]. 摩擦学学报, 2021, 41(1): 115-124. DOI: 10.16078/j.tribology.2020060
引用本文: 尹露, 张万福, 姜广政, 潘渤, 李春. 超临界二氧化碳高低齿梳齿密封动力稳定性研究[J]. 摩擦学学报, 2021, 41(1): 115-124. DOI: 10.16078/j.tribology.2020060
YIN Lu, ZHANG Wanfu, JIANG Guangzheng, PAN Bo, LI Chun. Dynamic Stability of Staggered Labyrinth Seals with Supercritical Carbon Dioxide[J]. TRIBOLOGY, 2021, 41(1): 115-124. DOI: 10.16078/j.tribology.2020060
Citation: YIN Lu, ZHANG Wanfu, JIANG Guangzheng, PAN Bo, LI Chun. Dynamic Stability of Staggered Labyrinth Seals with Supercritical Carbon Dioxide[J]. TRIBOLOGY, 2021, 41(1): 115-124. DOI: 10.16078/j.tribology.2020060

超临界二氧化碳高低齿梳齿密封动力稳定性研究

Dynamic Stability of Staggered Labyrinth Seals with Supercritical Carbon Dioxide

  • 摘要: 建立超临界二氧化碳(supercritical carbon dioxide,SCO2)高低齿梳齿密封三维数值计算模型,应用基于微元理论的密封动特性识别方法,研究凸台宽度及密封间隙对超临界二氧化碳梳齿密封动静特性的影响,并与传统梳齿密封进行对比. 研究表明:高低齿梳齿密封的交叉复合刚度系数对有效阻尼系数影响较小,主阻尼对其占主要影响. 在低涡动频率下(<160 Hz),传统梳齿密封动力稳定性较好;而涡动频率高于160 Hz时,高低齿梳齿密封的有效阻尼系数约为传统梳齿密封的105%~113%;且存在1个最佳凸台宽度使密封系统稳定性最好(本文最佳值为5.13 mm);随着密封间隙的减小,有效阻尼系数的大小与频率依赖性分别增大、增强. 高低齿梳齿密封泄漏量较传统梳齿密封降低约45.5%;凸台宽度5.13 mm、密封间隙0.4 mm时较原始模型(b=4 mm、c2=0.5 mm)泄漏量分别降低约5%和19%,高低齿梳齿密封泄漏量随密封间隙的减小而降低.

     

    Abstract: Numerical analysis model of the staggered labyrinth seal with supercritical CO2 as working fluid was established. The dynamic and static characteristics of the staggered labyrinth seal for different width of rotor convex plate, clearance of seal and compared with the conventional labyrinth seal were studied based on infinitesimal theory. Results showed that the cross-coupled complex dynamic stiffness of staggered labyrinth seals had little effect on the effective damping coefficient, and the main damping had a major influence on it. At low whirling frequency (<160 Hz), the conventional labyrinth seal had better dynamic stability. When the whirling frequency was higher than 160 Hz, the effective damping coefficient of the staggered labyrinth seal was about 105% to 113% of the conventional labyrinth seal. The optimal value of the convex plate width to make the sealing system the best stability was 5.13 mm in this paper. With the decrease of seal clearance, the effective damping coefficient increased and the frequency dependence increased. The leakage flow rate of staggered labyrinth seal was 45.5% lower than that of conventional labyrinth seal. Compared with the original model (b=4 mm, c2=0.5 mm), the leakage flow rate of 5.13 mm convex plate width and 0.4 mm seal clearance was reduced by about 5% and 19%, respectively. The leakage flow rate of staggered labyrinth seal decreased with decreasing of seal clearance.

     

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