节流孔径对静压圆弧槽干气密封端面流场影响的数值模拟

应用SolidWorks软件分别建立4种不同节流孔径静压干气密封三维几何模型,并运用Gambit软件对4种模型分别进行网格划分.利用Fluent软件对端面流场进行数值模拟,得到流场的压力分布、速度分布以及泄漏量、气膜开启力.同时对节流孔直径与气膜推力泄漏量比值进行优化,获得最佳结构参数.数值结果表明:端面压力在节流孔处最高,向四周逐渐下降,密封气在流经节流孔后形成显著的压力降,随节流孔径的增大泄漏量上升;随节流孔径的增大气膜推力增大.

Numerical simulation of influence of throttle orifice diameter on flow field near end surface of dry gas seal with static circular grooves

Three-dimensional geometric model of static pressure dry gas seal with four different throttle apertures were established by using software SolidWorks and meshed by using software Gambit.The flow field near its end surface was simulated numerically with software Fluent to obtain pressure distribution,velocity distribution,leakage,and gas film opening force.Meanwhile,the diameter of throttle orifice and the ratio of gas film thrust to leakage were optimized to get the optimal structural parameters.Numerical result showed that the pressure on the end surface was maximum and decreased gradually outward.There was a remarkable pressure drop in the gas flow across the throttle orifice.The leakage through the static pressure dry gas seal and gas film thrust would increase with the throttle aperture diameter.