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Open AccessArticle

Research on Rotordynamic Characteristics of Pump Annular Seals Based on a New Transient CFD Method

National-Provincial Joint Engineering Laboratory for Fluid Transmission System Technology, Zhejiang Sci-Tech University, Hangzhou 310018, China
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Processes 2020, 8(2), 227; https://doi.org/10.3390/pr8020227
Received: 31 December 2019 / Revised: 11 February 2020 / Accepted: 12 February 2020 / Published: 15 February 2020
(This article belongs to the Special Issue Advancement in Computational Fluid Mechanics and Optimization Methods)
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. View Full-Text
Keywords: pump annular seals; transient CFD method; rotordynamic characteristics; seal length pump annular seals; transient CFD method; rotordynamic characteristics; seal length
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Li, F.; Cui, B.; Zhai, L. Research on Rotordynamic Characteristics of Pump Annular Seals Based on a New Transient CFD Method. Processes 2020, 8, 227.

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