多重效应下超高速干气密封流场模拟及密封性能试验  

Flow simulation and sealing performance test of ultra-high speed dry gas seal under multiple effects

作　　者：丁俊华 俞树荣[1] 王世鹏 洪先志 包鑫 丁雪兴[1] DING Junhua;YU Shurong;WANG Shipeng;HONG Xianzhi;BAO Xin;DING Xuexing(College of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu,China;Chengdu Yitong Seal Co.,Ltd.,Chengdu 610100,Sichuan,China)

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050 [2]成都一通密封股份有限公司,四川成都610100

出　　处：《化工学报》2023年第5期2088-2099,共12页CIESC Journal

基　　金：国家重点研发计划项目(2020YFB2010001)。

摘　　要：为探究重大关键设备中超高速干气密封的气膜流场规律,考虑超高转速产生的湍流效应、惯性效应、真实气体效应、阻塞流效应对气膜流场和密封性能的影响,构建多重效应下湍流计算模型。试验验证理论模型的正确性和有效性,并探索超高速条件下不同工况参数和结构参数对密封性能的影响。研究结果表明:湍流效应下,泄漏率随转速和介质压力的增大而增大;开启力随转速的增大先略微减小后逐渐增大,而随介质压力的增大非线性提升。本实例超高速工况下(50000 r/min、11 MPa),优化结果表明螺旋角选择16°,槽深则在6~7μm范围内选择。这为设计和制造超高速干气密封提供了理论支撑。In order to investigate the law of gas film flow field of ultra-high speed dry gas seals in major key equipment,considering the turbulence effect,inertia effect,real gas effect,and choked flow effect caused by ultra-high speed on the gas film flow field and sealing performance,a turbulence calculation model under multiple effects was constructed.The test verifies the correctness and validity of the theoretical model,and explores the influence of different operating conditions and structural parameters on the sealing performance under the ultra-high speed condition.The results show that the leakage rate increases with the increase of rotational speed and medium pressure under the turbulence effect;the opening force decreases slightly with the increase of rotational speed and then gradually increases,while the opening force increases nonlinearly with the increase of medium pressure.In this example,under ultra-high speed working conditions(50000 r/min,11 MPa),the optimization results show that the spiral angle should be selected as 16°,and the groove depth should be selected in the range of 6—7μm.This provides theoretical support for the design and manufacture of ultra-high speed dry gas seals.

关 键 词：超高速 干气密封 湍流效应 数值模拟 试验研究 

分 类 号：TH136[机械工程—机械制造及自动化]