Abstract The film stiffness of dry gas seal must be sufficient to keep gas film stable at high and low speed. A generalized geometric model based on triangles is proposed to characterize spiral grooves. A mathematical model is established and solved using the finite-difference method to obtain steady performance. The optimum spiral grooves for maximum opening force and film stiffness are obtained at low speed, and their steady performance is compared with conventional spiral grooves numerically and experimentally. The pressure and flow field of optimum spiral grooves and conventional spiral grooves are simulated to reveal the mechanism of the performance difference. Results show that through-combined spiral grooves outperform the other derived spiral grooves. Their film stiffness is up to 15% larger than that of conventional spiral grooves at low speed.

中文翻译：

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通过低速变形提高螺旋槽干气密封膜刚度：数值结果与实验

摘要 干气密封的油膜刚度必须足够，以保证高速和低速下的气膜稳定。提出了一种基于三角形的广义几何模型来表征螺旋槽。采用有限差分法建立并求解数学模型，以获得稳定的性能。在低速下获得了最大开启力和薄膜刚度的最佳螺旋槽，并通过数值和实验将其稳定性能与常规螺旋槽进行了比较。对最优螺旋槽和常规螺旋槽的压力和流场进行了模拟，揭示了性能差异的机理。结果表明，直通组合螺旋槽优于其他衍生螺旋槽。