V型槽开口角度对端面干气密封稳态特性的数值分析

Numerical Analysis of the Steady-state Characteristics of V-groove Opening Angle on End Face Dry Gas Seals

端面干气密封已广泛应用于化工旋转机械中,但对于其密封副的双向旋转槽型缺少系统的研究。针对V型槽端面干气密封运行原理和结构特点,在气膜润滑理论的基础上,建立了相应的数学模型。采用中心差分法对压力和气膜厚度控制方程进行了耦合求解,并验证了编制程序的正确性。随后利用验证后的代码对端面干气密封的稳态特性参数展开了计算,并分析讨论了工况参数改变时V型槽不同的开口角度对端面干气密封稳态特性参数的影响。研究表明:本研究所数学模型具有一定的普适性,而且V型槽开口角度为α=15°的密封性能最好,四种开口角度所产生的密封效果优劣排序为α=15°>α=60°>α=30°>α=45°。V型槽端面干气密封在所讨论的工况参数范围内,气膜开启力和气膜摩擦力随转速和压力的增大而提高;泄漏量随转速的增大略微下降,随压力的增大而呈线性增大。此研究结果为端面干气密封的双向旋转槽型的设计与研究提供了参考依据。

End face dry gas seals have been widely used in chemical rotating machinery,but there is a lack of systematic research on the bi-directional rotating groove type of its sealing sub.The corresponding mathematical model is established based on the theory of gas film lubrication for the operating principle and structural characteristics of V-groove face dry gas seal.The coupled solution of the pressure and gas film thickness control equations was carried out using the central difference method,and the correctness of the prepared program was verified.Then,the steady-state charac-teristics of the end face dry gas seal are calculated using the validated code,and the effect of different opening angles of the V-groove on the steady-state characteristics of the end face dry gas seal when the operating parameters are changed is analyzed and discussed.The study shows that the mathe-matical model is universal and the best sealing performance is achieved with the opening angle of V-grooveα=15°,and the sealing effect of the four opening angles is ranked as followsα=15°>α=60°>α=30°>α=45°.The leakage volume decreases slightly with the increase of rotational speed and increases linearly with the increase of pressure.The results of this study provide a reference for the design and research of bi-directional rotating groove type of end face dry gas seal.