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

为了提高密封的稳定性，对蜂窝孔结构的阻尼器密封进行了静、动态特性的试验研究。试验所用的密封是三种不同孔深的阻尼器密封(阻尼器密封I：30微米，阻尼器密封II：400微米，阻尼器密封III：深度500微米)和环形平面密封(表面光滑)。结果表明：(1)泄漏量Q随密封进出口端压差的增大而增大，而转子转速对Q的影响不明显。在相同的条件下，阻尼器密封的Q值仅为环形平面密封的2/3左右，并且随着孔深的增加而减小。(2)阻尼器密封II的径向反力与环形平面密封基本相同，而大于…。其他阻尼器密封圈的更多e。所有阻尼器密封产生的切向反作用力均大于环形平面密封。(3)阻尼器密封的omega/omega(omega：转子旋转速度)不稳定范围受omega的影响不大，而环形平面密封的不稳定范围随omega的增大而增大。这表明，与环形密封相比，阻尼器密封的入口涡流对密封间隙内周向流动的影响较小。(4)与环形密封相比，阻尼器密封I的主阻尼系数增加了约70%，阻尼器密封II增加了约20%，阻尼器密封III增加了约40%。(5)阻尼器密封的泄漏性能好于环形密封。此外，从产生较高转子稳定性的角度来看，II阻尼器密封比其他阻尼器密封和环形平面密封具有更好的动态特性。这表明蜂窝孔型阻尼器密封存在一个合适的孔深。较少

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