Research on Rotordynamic Characteristics of Pump Annular Seals Based on a New Transient CFD Method
Research on Rotordynamic Characteristics of Pump Annular Seals Based on a New Transient CFD Method
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DOI：
10.3390/pr8020227
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发表时间：
2020-02
期刊：
影响因子：
3.5
通讯作者：
Fengqin Li;B. Cui;Lulu Zhai
中科院分区：
文献类型：
--
作者：
Fengqin Li;B. Cui;Lulu Zhai
泵的环形密封会产生流体反力，对泵系统的振动特性和稳定性有很大影响。因此，研究环形密封的转子动力学特性具有重要意义。本文提出了一种新的动网格瞬态计算流体动力学（CFD）方法来研究泵环形密封的转子动力学特性。通过与实验结果和整体流法计算结果的对比，验证了瞬态CFD方法的可靠性，并利用瞬态CFD方法研究了密封长度与转子动力特性的关系。结果表明，随着密封长度的增加，直接刚度急剧减小甚至变为负值，这一现象可能会改变作用在转子表面的流体力的方向，从而影响泵转子的支承状态。随着密封长度的增加，涡动频率比逐渐增大，削弱了泵转子系统的稳定性。
Pump annular seals can cause fluid reaction forces that have great effects on the vibration characteristic and stability of a pump system. For this reason, it is important to study rotordynamic characteristics of annular seals. In this paper, a new transient computational fluid dynamics (CFD) method with dynamic mesh is proposed to investigate rotordynamic characteristics of the pump annular seal. The reliability of the transient CFD method is validated by comparison with the results from the experiment and the bulk-flow method, and the relationship between the seal length and rotordynamic characteristics is investigated by the transient CFD method. The results indicate that direct stiffness decreases sharply even turns to negative as the seal length increases, this phenomenon may change the direction of fluid force on the rotor surface and affect supporting condition of the pump rotor. With the increasing seal length, the whirl frequency ratio gradually increases, which would weaken the stability of the pump rotor system.