中国机械工程2026，Vol.37Issue(8)：1824-1831,8.DOI:10.3969/j.issn.1004-132X.2026.08.002
减磨槽深度对石墨圆周密封泄漏流动特性影响研究
Effects of Wear-reducing Groove Depth on Leakage and Flow Characteristics of Graphite Circumferential Seal
摘要
Abstract
During the operation of graphite circumferential seals,degradation in tracking performance may cause contact between the inner sealing surface and the rotor runway,leading to wear and subsequent failure of the dynamic-pressure wear-reducing groove.However,a theoretical basis for determining the groove depth in engineering applications remains lacking.In this study,a numerical model of leakage and flow characteristics for the graphite circumferential seal is established and validated through experiments.Based on the validated model,the airflow evolution and leakage variation through the seal clearance are comparatively analyzed under different inlet/outlet pressure differences and groove depths,aiming to reveal the influence mechanism of groove depth on the leakage and flow characteristics.The results indicate that as the groove depth increases to 150 μm,the area of the local high-pressure zone around the groove gradu-ally decreases,suggesting a weakening of the hydrodynamic pressure effect.However,this decreasing trend becomes less pronounced with increasing inlet/outlet pressure difference.The airflow velocity near the groove wall decreases significantly with increasing groove depth.Notably,when the groove depth ex-ceeds 100 μm,a local high-velocity region appears near the groove bottom,and its area expands with both increasing groove depth and increasing pressure difference.When the groove depth exceeds 25 μm,reverse flow is observed at the groove end due to the obstruction of the step wall.Further increase in groove depth intensifies the reverse flow velocity,which consequently reduces the hydrodynamic pressure effect of the graphite circumferential seal.关键词
石墨圆周密封/减磨槽/泄漏流动特性/流体动压效应/槽深Key words
graphite circumferential sealing/wear-reducing groove/leakage flow characteristics/hy-drodynamic pressure effect/groove depth分类
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王壮,赵欢,孙丹,张立静,王鑫宇,温帅方,樊汝凤..减磨槽深度对石墨圆周密封泄漏流动特性影响研究[J].中国机械工程,2026,37(8):1824-1831,8.基金项目
国家自然科学基金(52375195) （52375195）
辽宁省自然科学基金(2022-MS-301) （2022-MS-301）
辽宁省属本科高校基本科研业务费专项资金(20240241) （20240241）
