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| Dynamic analysis for vibration and impact of liquid film sealing |
| XU Lushuai1，HAO Muming2，YUAN Xiaoyang1，WANG Yunlei1，JIN Yingze1，LI Yongfan2 |
1.Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi’an JiaoTong University, Xi’an 710049, China;
2.Institute of Sealing Technology, China University of Petroleum (East China), Qingdao 266580, China |
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Abstract The instantaneous change of operating conditions, system vibration and insufficient lubrication easily cause rub-impact of sealing surface, which has serious effect on the service life of liquid film seals. Dynamic model of sealing system considering face contact was established. Then the equations of motion, Reynolds equation considering mass conservation cavitation boundary condition and asperity contact equation were solved simultaneously at each time step. Furthermore, the effects of liquid film cavitation, axial disturbance and transient operating conditions on seal stability and impact characteristics were investigated. Results show that cavitation dramatically improves the anti-disturbance ability of sealing system. The vibration frequency of liquid film is significantly larger than that of full film lubricated regime when contact occurs. The impact force and shock frequency are continuously enhanced with increase of speed and pressure. There is an obvious change of velocity direction at the instant of face impact.
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Received: 15 March 2019
Published: 28 July 2020
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