Eccentricity Effects on the Rotordynamic Coefficients of Plain Annular Seals: Theory Versus Experiment
Eccentricity Effects on the Rotordynamic Coefficients of Plain Annular Seals: Theory Versus Experiment
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DOI：
10.1115/1.2833515
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发表时间：
1997-07
影响因子：
2.5
通讯作者：
O. Marquette;D. Childs;L. Andrés
中科院分区：
文献类型：
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作者：
O. Marquette;D. Childs;L. Andrés
给出了中心位置和偏心位置处普通环形密封泄漏和转子动力学系数的可靠高速数据。对L/D = 0.45的密封进行了测试，测试结果具有良好的信噪比。研究了压力降、转速和静偏心对转子动力系数的影响。有一个很好的协议之间的实验和理论结果的中心位置，即使是直接的惯性条款，在过去的研究中没有表现出良好的一致性与预测。然而，转子动力系数对偏心率的变化比预测的更敏感。这些结果表明，在某些情况下，泵的环形密封可能需要更像流体动力轴承一样处理，转子动力学系数对于围绕静态平衡位置的小运动有效，而不是当前的偏心率独立系数。
Reliable high-speed data are presented for leakage and rotordynamic coefficients of a plain annular seal at centered and eccentric positions. A seal with L/D = 0.45 was tested, and measured results have good signal-to-noise ratios. The influence on rotordynamic coefficients of pressure drop, running speed, and static eccentricity was investigated. There is an excellent agreement between experimental and theoretical results in the centered position, even for direct inertia terms, which have not shown good agreement with predictions in past studies. However, the rotordynamic coefficients are more sensitive to changes in eccentricity than predicted. These results suggest that, in some cases, annular seals for pumps may need to be treated more like hydrodynamic bearings, with rotordynamic coefficients which are valid for small motion about a static equilibrium position versus the present eccentricity-independent coefficients.