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

为了提高密封的稳定性，对蜂窝孔阻尼密封的静、动态特性进行了试验研究。用于测试的密封件是具有不同孔深度的三种类型的阻尼器密封件（阻尼器密封件I：30 μ m，阻尼器密封件II：400 μ m，阻尼器密封件III：500 μ m深度）和环形平面密封件（光滑表面）。结果表明：（1）泄漏流量Q随密封进出口压差的增大而增大，而转子转速ω对Q的影响不显著;在相同条件下，阻尼密封的Q值仅为环形密封的2/3左右，且随孔深的增加而减小。(2)阻尼密封Ⅱ的径向反力与环形密封的径向反力基本相同，但大于环形密封的径向反力。 关于我们 e用于其他阻尼器密封件。所有阻尼密封产生的切向反作用流体力都比环形平面密封大。(3)阻尼器密封的Ω/Ω（Ω：转子旋转速度）的不稳定范围不受Ω的显著影响，而环形平面密封的不稳定范围随Ω的增加而增加。这表明，与环形平面密封相比，阻尼器密封的进口涡流对密封间隙中周向流的影响在性质上较小。(4)与环形密封件相比，阻尼器密封件I的主阻尼系数增加了约70%，阻尼器密封件II增加了约20%，阻尼器密封件III增加了约40%。(5)阻尼密封比环形密封具有更好的泄漏性能。此外，从产生更高的转子稳定性的角度来看，阻尼器密封II显示出比其他阻尼器密封和环形平密封更好的动态特性。这表明，一个合适的孔深度存在的阻尼器密封与蜂窝孔模式。少

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