Experimental Study on Static and Dynamic Characteristics of Damper Seals Yieding High Rotor-Stability

转子高稳定性阻尼密封件静态和动态特性的实验研究

• 批准号: 08650169
• 负责人: KANEKO Satoru
• 金额: $ 1.41万
• 依托单位: Nagaoka University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650169/
• 关键词: Damper seals; Honeycombed-Holes-Pattern; Hole depth; Leakage flow rate; Dynamic fluid force; Dynamic coefficients

In order to improve the seal stability characteristics, the experimental investigation of the static and dynamic characteristics has been developed for the damper seals with honeycombed-holes-pattern. The seals used for the tests are three types of the damper seals with different hole depth (damper seal I : 30mum, damper seal II : 400mum, damper seal III : 500mum in depth) and an annular plain seal (smooth surface). All test seals have approximately the same minimum redial clearance.The results obtainded rea as follows :(1) The leakage flow Q increases with the pressure difference between the inlet and outlet end of the seal, whereas the effect of rotor spinning velocity omega on Q is not significant. Under the same condition, Q for the damper seals is only about 2/3 that of the an nular plain seal, and it decreases with an indrease in the hole depth.(2) The radial reaction fluid-force for the damper seal II is almost the same as that for the annular plain seal, and is larger than thos … More e for the other damper seals. All damper seals yield larger tangenial reaction fluid-force than the annular plain seal.(3) The instability range of OMEGA/omega (OMEGA : rotor whirling velocity) for the damper seals is not significantly affected by omega, while that for the annular plain seal increases with omega. This suggests that the effect of the inlet swirl on the circumferential flow in the seal clearance is qualitatively small for the damper seals as compared to that for the annular plain seal.(4) As compared to the annular seal, an increase in the main damping coefficient has been obtained by approximately 70 percent for the damper seal I,by approximately 20 percent for the damper seal II and by approximately 40 percent for the damper seal III.(5) The damper seals have better leakage performance than the annular plain seal. Furthemore, the damper seal II shows better dynamic characteristics than the other damper seals and the annular plain seals from the viewpoint of yielding higher rotor-stability. This suggests that a suitable hole depth exists for the damper seals with the honeycombed-holes-pattern. Less

为了提高密封稳定性能，对蜂窝孔型阻尼器密封件进行了静态和动态特性的实验研究，试验所用的密封件是三种不同孔深的阻尼器密封件。阻尼密封 I：30mum，阻尼密封 II：400mum，阻尼密封 III：500mum 深度）和环形平面密封（光滑表面）。所得结果如下：(1)泄漏流量Q随着密封件进出口端压差的增大而增大，而转子旋转速度omega对Q的影响并不显着。相同条件下，阻尼密封件的 Q 值仅为环形滑动密封件的 2/3 左右，并且随孔深的增加而减小。 (2) 阻尼密封件 II 的径向反作用力几乎为与环形滑动密封相同，并且比其他阻尼密封更大。所有阻尼密封产生比环形滑动密封更大的切向反作用力。(3) OMEGA/omega 的不稳定性范围。阻尼器密封件的 OMEGA（转子涡动速度）不受 omega 的显着影响，而环形平面密封件的转子涡动速度则随着 omega 的增加而增加，这表明入口涡流对转子涡流的影响。与环形滑动密封件相比，阻尼密封件的密封间隙中的周向流量很小。(4) 与环形密封件相比，阻尼器的主阻尼系数增加了约 70%密封件 I 的泄漏性能比阻尼密封件 II 的泄漏性能高约 20%，阻尼密封件 III 的泄漏性能约高 40%。 (5) 阻尼密封件比环形滑动密封件具有更好的泄漏性能。从产生更高的转子稳定性的角度来看，阻尼器密封件 II 表现出比其他阻尼器密封件和环形滑动密封件更好的动态特性，这表明具有较小蜂窝孔图案的阻尼器密封件存在合适的孔深度。