Abstract
Based on the 3D mechanical model for a large gap annular flow developed by authors, the zero-order perturbation equations of 3D non-linear partial differential equations of the motion of an eccentric rotor in a finite-length large gap annular flow are derived in this paper. The zero-order perturbation equations are also 3D non-linear partial differential equations, and it is a little difficult to get their solutions. Therefore, a simplified numerical method, which is based on the analysis results of a finite-length concentric large gap annular flow done by authors before, is put forward in order to analyze the dynamic coefficients of the eccentric rotor in the finite-length large gap annular flow. Comparing with existing numerical results and testing results, this method is sufficient and accurate. Numerical results show that the dynamic coefficients of the eccentric rotor in the finite-length large gap annular flow have still not the features: the main terms are equal, the couple terms are equal and opposite, comparing with that of the concentric rotor in the finite-length large gap annular flow. All main terms of dynamic coefficients increase exponentially in different degrees with the increase of eccentricity ratio, this shows that the dynamic coefficients of an eccentric rotor in a finite-length large gap annular flow will increase greatly in a large eccentricity.
Key words
eccentric /
finite-length /
large gap annular flow /
dynamic characteristics /
numerical method
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Sun Qi-guo .
Study on the dynamic characteristics of an eccentric finite-length large gap annular flow [J]. Journal of Vibration and Shock, 2011, 30(10): 228-230，
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