填料密封阻塞下气体螺旋密封的数值模拟研究

针对填料密封阻塞下的气体螺旋密封泄漏问题,利用多孔介质概念对填料密封阻塞下的气体螺旋密封做了计算流体力学(CFD)数值模拟,用多孔介质概念来类比填料密封泄漏的机理,建立了相应的计算模型,并分析了该方法的可行性。数值模拟的计算结果表明,在给定的泄漏量条件下,填料密封渗透率分别随着螺旋密封的螺旋角,螺旋结构与壁面间隙及螺旋结构本身的槽深增大而减小,成反比例关系。当螺旋结构的螺旋角,螺旋结构与壁面间隙及螺旋结构本身槽深增大到一定范围时,螺旋密封的效果大大降低,这时填料密封在整个密封装置中起主要的密封作用。该研究结果为填料密封作用下的螺旋密封设计提供了一定的理论基础。

Numerical simulation of spiral sealing with an additional gland seal on gas

Aiming at leakage of spiral sealing with an additional gland seal on gas,computational fluid dynamics（CFD） simulations of gas spiral sealing with an additional gland seal were conducted using the concept of porous media for modeling the gland seal,the model was established.The results indicate that the permeability of the gland seal decreases with increasing angle of spiral sealing,its groove depth and gap thickness if a given leakage condition is defined.When the angle,gap thickness and groove depth reach a certain range,spiral sealing effect is reduced,then the gland seal plays a dominant role in the whole sealing structure.The results are very helpful for researching and designing the spiral sealing with an additional gland seal.