The purpose of this paper is to enhance film stiffness and control seal leakage of conventional spiral groove dry gas seal (S-DGS) at a high-speed condition by introducing a new type superellipse surface groove.,The steady-state performance and dynamic characteristics of superellipse groove dry gas seal and S-DGS are compared numerically at a high-speed condition. The optimized superellipse grooves for maximum steady-state film stiffness and dynamic stiffness coefficient are obtained.,Properly designed superellipse groove dry gas seal provides remarkable larger steady-state film stiffness, dynamic stiffness coefficient and lower leakage rate at a high-speed condition compared to a typical S-DGS. The optimal values of first superellipse coefficient for maximum steady and dynamic stiffness are 1.3 and 1.4, whereas the optimal values of second superellipse coefficient for which are 1.4 and 2.0, respectively.,A new type of molded line, namely, superellipse curve, is proposed to act as the boundary lines of surface groove of dry gas seal, as an alternative of typical logarithm helix. The conclusions provide references for surface groove design with larger stiffness and lower leakage rate at a high-speed condition.

中文翻译：

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高速工况下超椭圆槽干气密封的稳态性能和动态特性

本文的目的是通过引入一种新型超椭圆曲面槽来提高常规螺旋槽干气密封（S-DGS）在高速条件下的油膜刚度和控制密封泄漏。,稳态性能和动态特性超椭圆槽干气密封和 S-DGS 在高速条件下的数值比较。获得了最大稳态油膜刚度和动态刚度系数的优化超椭圆槽。，与高速条件相比，正确设计的超椭圆槽干气密封在高速条件下可提供显着更大的稳态油膜刚度、动态刚度系数和更低的泄漏率。典型的 S-DGS。最大稳态刚度和动态刚度的第一超椭圆系数的最佳值为 1.3 和 1.4，而第二个超椭圆系数的最佳值分别为1.4和2.0。,提出了一种新型的模线，即超椭圆曲线作为干气密封表面凹槽的边界线，作为替代典型的对数螺旋。研究结论为高速工况下具有较大刚度和较低泄漏率的表面沟槽设计提供了参考。