微间隙高速流体效应对箔片柱面气膜密封性能的影响  

Influence of micro-gap high-speed fluid effects on compliant foil cylindrical gas film seal performance

作　　者：江澳翔 陈源 李运堂 江锦波[2] 彭旭东[2] 章聪 王冰清 JIANG Aoxiang;CHEN Yuan;LI Yuntang;JIANG Jinbo;PENG Xudong;ZHANG Cong;WANG Bingqing(College of Mechanical and Electrical Engineering,China Jiliang University,Hangzhou 310018,Zhejiang,China;College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310032,Zhejiang,China)

机构地区：[1]中国计量大学机电工程学院,浙江杭州310018 [2]浙江工业大学机械工程学院,浙江杭州310032

出　　处：《化工学报》2024年第10期3691-3704,共14页CIESC Journal

基　　金：浙江省自然科学基金重点项目(LZ23E050002);国家自然科学基金青年基金项目(51905513);浙江省属高校基本科研业务费专项资金项目(2021YW07)。

摘　　要：以超临界二氧化碳为润滑介质,考虑湍流、阻塞、惯性等高速流体效应建立箔片柱面气膜密封润滑理论模型,研究不同高速流体效应组合下密封端面流场、箔片变形的变化规律,揭示了高速高压超临界二氧化碳箔片柱面气膜密封的运行机理,进一步分析工况和结构参数对密封性能的影响规律,获得了结构参数的优选范围。结果表明:湍流效应对超临界二氧化碳箔片柱面气膜密封润滑界面流场和密封性能影响较大,阻塞效应和惯性效应影响相对较小;各流体效应之间存在交互作用,湍流效应会使阻塞出口边界压力减小,惯性效应会使阻塞出口边界压力增大,湍流效应条件下惯性效应对气膜浮升力的影响作用更为显著;当长径比取2.0~2.5、柔度系数取0.001~0.003时,密封性能较优。Using supercritical carbon dioxide as the lubrication,a theoretical model of foil cylindrical air film seal lubrication is established considering the high-speed fluid effects such as turbulence,blockage and inertia.The study investigates the variations in the seal end flow field and foil deformation under different combinations of high-speed fluid effects,revealing the operational mechanism of high-speed,high-pressure supercritical carbon dioxide compliant foil cylindrical gas film seal.Furthermore,the impact of operating conditions and structural parameters on sealing performance is analyzed,providing an optimal range for structural parameters.The results show that turbulent effects have a significant impact on the flow field and sealing performance of the supercritical carbon dioxide compliant foil cylindrical gas film seal lubrication interface,while blockage and inertia effects are relatively minor.There are interactions among various fluid effects:turbulent effects reduce the pressure at the blockage exit boundary,while inertia effects increase it.Moreover,under turbulent conditions,inertia effects have a more significant impact on the float force.Optimal sealing performance is achieved when the length-to-diameter ratio is between 2.0—2.5 and the flexibility coefficient is between 0.001—0.003.

关 键 词：箔片密封 超临界二氧化碳 高速流体效应 密封性能 数值分析 

分 类 号：TH117.2[机械工程—机械设计及理论]