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中南大学学报(英文版)

Journal of Central South University

Vol. 24    No. 8    August 2017

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Numerical simulation on rotordynamic characteristics of annular seal under uniform and non-uniform flows
WU Da-zhuan(吴大转)1, 2, JIANG Xin-kuo(姜新阔)1, CHU Ning(初宁)3, WU Peng(武鹏)1, WANG Le-qin(王乐勤)1

1. College of Energy and Engineering, Zhejiang University, Hangzhou 310027, China;
2. State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China;
3. Department of Engineering, Swiss Federal Institute of Technology in Lausanne, Lausanne 1024, Switzerland

Abstract:Currently, the flow field of annular seals disturbed by the circular whirl motion of rotors is usually solved using computational fluid dynamics (CFD) to evaluate the five rotordynamic coefficients. The simulations are based on the traditional quasi-steady method. In this work, an improved quasi-steady method along with the transient method was presented to compute the rotordynamic coefficients of a long seal. By comparisons with experimental data, the shortcomings of quasi-steady methods have been identified. Then, the effects of non-uniform incoming flow on seal dynamic coefficients were studied by transient simulations. Results indicate that the long seal has large cross stiffness k and direct mass M which are not good for rotor stability, while the transient method is more suitable for the long seal for its excellent performance in predicting M. When the incoming flow is non-uniform, the stiffness coefficients vary with the eccentric directions. Based on the rotordynamic coefficients under uniform incoming flow, the linearized fluid force formulas, which can consider the effects of non-uniform incoming flow, have been presented and can well explain the varying-stiffness phenomenon.

 

Key words: long pump seal; rotordynamic coefficients; transient computational fluid dynamics (CFD); dynamic mesh; non-uniform incoming flow

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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