Theoretical analysis and experiment on gas film stiffness with slip flow in a spiral-grooved dry gas seal
Theoretical analysis and experiment on gas film stiffness with slip flow in a spiral-grooved dry gas seal
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DOI：
10.1108/ilt-03-2021-0075
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发表时间：
2021-04
影响因子：
1.6
通讯作者：
Junjie Lu
中科院分区：
文献类型：
--
作者：
Junjie Lu
目的研究螺旋槽干气密封的气膜刚度。设计/方法/途径本研究首次尝试使用干气密封的新测试技术来计算考虑滑移效应的气膜刚度。首先，建立了考虑微间隙滑移效应的修正广义雷诺方程的理论模型。其次，通过建立动态测试系统，对微尺度气膜振动和静止环振动进行检测，确定气膜刚度。结果表明，螺旋角和槽深是改善气膜刚度的最佳值，螺旋角为1.34rad(76.8℃)，槽深为1×10-5m，实验中得到的最佳结构参数可以获得较高的气膜刚度。实验与理论的平均误差小于20%。创新/价值本研究首次尝试使用干气密封的新测试技术来计算考虑滑移效应的气膜刚度。
Purpose This study aims to study the gas film stiffness of the spiral groove dry gas seal. Design/methodology/approach The present study represents the first attempt to calculate gas film stiffness in consideration of the slipping effect by using the new test technology for dry gas seals. First, a theoretical model of modified generalized Reynolds equation is derived with slipping effect of a micro gap for spiral groove gas seal. Second, the test technology examines micro-scale gas film vibration and stationary ring vibration to determine gas film stiffness by establishing a dynamic test system. Findings An optimum value of the spiral angle and groove depth for improved gas film stiffness is clearly seen: the spiral angle is 1.34 rad (76.8º) and the groove depth is 1 × 10–5 m. Moreover, it can be observed that optimal structural parameters can obtain higher gas film stiffness in the experiment. The average error between experiment and theory is less than 20%. Originality/value The present study represents the first attempt to calculate gas film stiffness in consideration of the slipping effect by using the new test technology for dry gas seals.