Journal ArticleDOI
Rotordynamic Force Prediction of Whirling Centrifugal Impeller Shroud Passages Using Computational Fluid Dynamic Techniques
J. Jeffrey Moore,Alan Palazzolo +1 more
TLDR
In this article, the rotordynamic forces arising from shrouded centrifugal impellers were analyzed using finite element stress analysis and computational fluid dynamics (CFD) techniques, and the results showed good correlation with experiment for both performance and rotord dynamic forces.Abstract:
The demand for higher efficiencies and performance of modern centrifugal turbomachinery requires improved knowledge of critical design factors in strength of materials, aerodynamics, and rotordynamics. While tremendous strides in finite element stress analysis and computational fluid dynamics (CFD) have addressed the first two areas, the lack of accurate prediction tools for centrifugal impellers typically leaves rotordynamics out of the design loop. While several authors have analyzed the rotordynamic forces arising from shrouded centrifugal impellers, there has been no study to couple the secondary shroud passage with the three-dimensional primary flow model. The strong interaction between these domains makes this approach advantageous. The current study utilizes CFD techniques to analyze the full three-dimensional viscous, primary/secondary flow field in a centrifugal pump impeller to determine rotordynamic forces. Multiple quasisteady solutions of an eccentric three-dimensional model at different precessional frequency ratios yield the rotordynamic impedance forces. Performing a second order least-squares analysis generates the skew-symmetric stiffness, damping, and mass matrices. The results show good correlation with experiment for both performance and rotordynamic forces.read more
Citations
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Journal ArticleDOI
Three-Dimensional CFD Rotordynamic Analysis of Gas Labyrinth Seals
TL;DR: In this article, the authors used 3D computational fluid dynamics (CFD) to model the labyrinth seal flow path by solving the Reynolds Averaged Navier Stokes equations.
Journal ArticleDOI
Numerical Study of Pressure Fluctuation and Unsteady Flow in a Centrifugal Pump
TL;DR: In this paper, a numerical study of the influence of pressure fluctuations and unsteady flow patterns was undertaken in the pump flow channel of three configurations with different diffuser vane numbers, and the amplitude of pressure fluctuation in the diffuser was increased gradually with the increase in number of diffuser vanes.
Journal ArticleDOI
Numerical Modeling of Fluid-Induced Rotordynamic Forces in Seals With Large Aspect Ratios
TL;DR: In this paper, the linearized rotordynamic coefficients for a seal with a large aspect ratio were calculated by means of a three-dimensional CFD analysis performed to predict the fluid-induced forces acting on the rotor.
Journal ArticleDOI
Hole-Pattern and Honeycomb Seal Rotordynamic Forces: Validation of CFD-Based Prediction Techniques
TL;DR: In this paper, the rotordynamic forces are obtained by means of a time-dependent perturbation of the rotor position with respect to the stator, and a sequence of perturbations frequencies is utilized to obtain the frequency dependence of the rotor dynamic force coefficients.
Journal ArticleDOI
On the Dynamic Properties of Pump Liquid Seals
Alexandrina Untaroiu,Vahe Hayrapetian,Costin D. Untaroiu,Houston G. Wood,Bruno Schiavello,James McGuire +5 more
TL;DR: In this article, the authors presented the linearized rotordynamic coefficients for a liquid seal with large aspect ratio subjected to incompressible turbulent flow, and used these coefficients to predict the rotor dynamic behavior of an industrial pump.
References
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Proceedings ArticleDOI
Robustness of coupled Algebraic Multigrid for the Navier-Stokes equations
TL;DR: The feasibility of using Algebraic Multigrid as the linear equation solver for an implicit CFD method that must handle diverse applications is shown.
Journal ArticleDOI
Analyses of hydrodynamic radial forces on centrifugal pump impellers
TL;DR: In this article, the authors investigated the hydrodynamic interactions between a centrifugal pump impeller and a volute and found that the inability of the blades to perfectly guide the flow through the impeller, and also included a quasi-one dimensional treatment of flow in the volute.
Journal ArticleDOI
Calculating Rotordynamic Coefficients of Seals by Finite-Difference Techniques
F. J. Dietzen,R. Nordmann +1 more
TL;DR: In this paper, the Navier-Stokes equations in connection with a turbulence (kappa-epsilon) model are solved by a finite-difference method, where a motion of the shaft round the centered position is assumed.
Journal ArticleDOI
Fluid-Structure Interaction Forces at Pump-Impeller-Shroud Surfaces for Rotordynamic Calculations
Journal ArticleDOI
Measurement of Hydrodynamic Interaction Matrices of Boiler Feed Pump Impellers
TL;DR: Evaluation des matrices d'interactions hydrodynamiques dans les rotors de pompes d'alimentation de chaudieres is presented in this article.
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