作　　者： ; ; ;

机构地区： 西华大学机械工程与自动化学院

出　　处： 《西南交通大学学报》 2007年第5期568-573,共6页

摘　　要： 为深入了解干气密封的端面流场特性,提高其运行稳定性,基于Navier-Stokes方程、层流模型和SIMPLEC算法,对干气密封端面流场进行了数值模拟,考察了不同端面间隙和转速情况下端面气膜压力分布和开启力情况.数值模拟结果表明,端面气膜压力总是在槽坝交界处产生较大变化,在气体流出的槽坝交界处产生流体动压,在气体流入的槽坝交界处局部存在负压;流体动压效应随端面间隙增大迅速减弱,在间隙较小(约小于3μm)时动压效应显著;进出口压力差的存在将提高密封端面的气膜开启力和刚度;增大正压区域的同时减小负压区域,可提高端面开启力和气膜刚度,从而提高密封的稳定性. Based on the Navier-Stokes equation, the laminar model and the SIMPLEC algorithm, the numerical simulation of face flow filed under different face clearances and rotational speeds was carried out to obtain more details about the fluid field and high stability of dry gas seal. The distribution of film pressure and the variety of opening force were investigated emphatically. The numerical result shows that there is a clear change in film pressure at the intersection of groove and dam. Hydrodynamic pressure produces at the outlet, and a negative pressure zone is formed at the inlet. Hydrodynamic pressure decreases rapidly with the increase of face clearance and changes acutely when the clearance is less than 3μm. The difference pressure of inlet and outlet will raise opening force and film stiffness. Opening force and film stiffness can be raised through enlarging the positive pressure zone and reducing the negative zone, and as a result, the stability of dry gas seal is increased.

关 键 词： 干气密封 压力分布 气膜刚度 开启力 数值模拟 端面间隙

领　　域： [机械工程]