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考虑涡动工况的螺旋槽液膜密封性能分析
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国家重点研发计划项目(2018YFB2000800);青岛市博士后应用研究项目(BY201802006)


Performance Analysis of the Spiral Groove Liquid Film Seals Considering Whirling of Rings
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    摘要:

    为进一步探索液膜密封性能影响机制,以上游泵送螺旋槽液膜密封为研究对象,基于满足质量守恒的Schnerr-Sauer空化模型,建立密封环涡动模型并基于圆形涡动轨迹,探讨了不同操作工况如压差、转速和膜厚时,涡动方向对密封性能和液膜空化影响。结果表明:正向涡动在变压差和变转速时均可提升液膜承载能力但加剧了泄漏量,反向涡动虽减小泄漏量但较大幅度降低液膜承载能力,不利于密封稳定性;变膜厚时,反向涡动显著降低液膜承载能力,而较大膜厚时正向涡动提升液膜承载能力相对较小;正向涡动有效促生液膜空化,而反向涡动在变压差时有助于抑制液膜空化但低速时对其无影响,并且受膜厚影响较小

    Abstract:

    In order to further explore the impact mechanism of sealing performance of liquid film seals, taking the upstream pumping spiral groove liquid film seals as a research object, the whirling model of rings was established based on the Schnerr-Sauer cavitation model complying with the conservation of mass. On account of the circular whirling trajectory, the effects of whirling directions on the sealing performance and cavitation of spiral groove liquid film seals were discussed under different operational conditions such as pressure difference, rotating speed and liquid film thickness. The results indicate that, the positive whirling can promote the loadcarrying capacity but aggravate leakage, the reverse whirling decreases the leakage but greatly lowers the loadcarrying capacity, the latter being not conductive to the stability of liquid film seals. When the liquid film thickness is changed, the reverse whirling significantly reduces the loadcarrying capacity,but the positive whirling can promote the loadcarrying capacity relatively smaller in case of larger film thickness.For the liquid film cavitation, the positive whirling acts as a catalyzer, while the reverse whirling inhibits it in the case of changing pressure difference and does not work at lower rotating speed, not being affected by the liquid film thickness.

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李振涛,汪艳红,刘馥瑜,郝木明,赵英杰.考虑涡动工况的螺旋槽液膜密封性能分析[J].机床与液压,2020,48(22):1-5.
LI Zhentao, ANG Yanhon, LIU Fuyu, HAO Muming, ZHAO Yingjie. Performance Analysis of the Spiral Groove Liquid Film Seals Considering Whirling of Rings[J]. Machine Tool & Hydraulics,2020,48(22):1-5

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  • 在线发布日期: 2021-04-22
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