Labyrinth Seal Rotordynamic Forces Using a Three-Dimensional Navier-Stokes Code

Rhode, D. L.; Hensel, Steve J.; Guidry, M. J.

doi:10.1115/1.2920936

Cited by 35 publications

(6 citation statements)

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“…Currently, the CFD analysis for the rotordynamic characteristics of the labyrinth seal have been carried out by many authors including Rhode [13], Ishii [14], Moore [15], and Hirano [16]. Benefiting from the axisymmetric shape and the frequency-independent rotordynamic coefficients of the labyrinth seal, these authors employed a coordinate transformation to transform unsteady problem into a steady one by solving the three dimensional, eccentric flow fields in the frame of reference attached to the whirling rotor.…”

Section: Introductionmentioning

confidence: 99%

Investigations on the Rotordynamic Coefficients of Pocket Damper Seals Using the Multifrequency, One-Dimensional, Whirling Orbit Model and RANS Solutions

Feng

2012

Journal of Engineering for Gas Turbines and Power

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The numerical approach using the muitifrequency one-dimensional whirling orbit model and Reynolds-averaged Navier-Stokes (RANS) solution was proposed for prediction of rotordynamic coefficients of pocket damper seal (PDS). By conducting the multiple frequencies one-dimensional whirling orbit for rotor center as the excitation signal, the unsteady RANS solutions combined with mesh deformation method were utilized to calculate the transient response forces on the PDS rotor surface. Unlike the single frequency whirling orbit models which require a separate computation for each frequency, the muitifrequency whirling orbit model yields results for multiple frequencies and therefore requires only one computation for different frequencies. The rotor motion signal and response force signal were transformed to the frequency domain using the fast fourier transform, then the eight rotordynamic coefficients of the PDS were determined at fourteen different vibration frequencies 20-300 Hz. The numerical results of rotordynamic coefficients of the PDS were in good agreement with experimental data. The accuracy and availability of the proposed method was demonstrated. The effects of vibration frequeticies and pressure ratios on the rotordynamic coefficients of PDS were also investigated using the presented numerical method. The muitifrequency one-dimensional whirling orbit model is a promising method for prediction of the rotordynamic coefficients of the PDS.

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Section: Introductionmentioning

confidence: 99%

Investigations on the Rotordynamic Coefficients of Pocket Damper Seals Using the Multifrequency, One-Dimensional, Whirling Orbit Model and RANS Solutions

Feng

2012

Journal of Engineering for Gas Turbines and Power

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“…With the development of computer technology, computational fluid dynamics (CFD) has become an important method to predict the flow and forces in seals since the 1990s. Rhode et al [13,14] developed a three-dimensional finite difference approach and studied the influence of inlet swirl on the flow though a labyrinth seal. It was shown that the inlet swirl has a significant influence on the forces produced by the flow in seal.…”

Section: Introductionmentioning

confidence: 99%

Analysis of rotordynamic forces for high inlet pre-swirl rate labyrinth seals

Kirk

Gao

2012

10th International Conference on Vibrations in Rotating Machinery

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“…Recently the progress of computer technologies makes it possible to utilize a CFD program for predicting the rotordynamic force of rotating machinery seals. Rhode [7,8], Ishii [9] and Kwanka [10] calculated the rotordynamic force of gas labyrinth seals using the CFD programs they developed. Moore [11] used SCISEAL, a CFD code specially developed for the analysis of the seals, and compared the results with experiment results and the bulk flow programs.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Rotordynamic Stability of a Steam Turbine Due to Labyrinth Seal Force

Hirano

Sasaki

Sakakida

et al. 2008

JPES

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This paper describes the evaluation of unstable vibration caused by the seal force, which is known as "Steam Whirl" in a steam turbine. Stability of a steam turbine is evaluated by complex eigenvalue analysis of rotordynamics model considering the dynamics of seals, rotor, bearings and pedestals. A commercial CFD program is employed to estimate the dynamic coefficients of labyrinth seal. The labyrinth seal of a large scales steam turbine is taken as an object of analysis and a 3D model with eccentric rotor is solved to obtain the rotordynamic force components. The rotordynamic force is derived by integrating the pressure on the rotor surface. Evaluation formula is formed from the results of numerical calculation, which is used to predict the dynamic coefficient of each seal in a steam turbine. Then rotordynamics model of total system including seal is constructed and stability is evaluated by complex eigenvalue analysis. This procedure is applied to the design of steam turbines and enables the optimization of the turbine structure considering the efficiency and stability.

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Labyrinth Seal Rotordynamic Forces Using a Three-Dimensional Navier-Stokes Code

Cited by 35 publications

References 0 publications

Investigations on the Rotordynamic Coefficients of Pocket Damper Seals Using the Multifrequency, One-Dimensional, Whirling Orbit Model and RANS Solutions

Investigations on the Rotordynamic Coefficients of Pocket Damper Seals Using the Multifrequency, One-Dimensional, Whirling Orbit Model and RANS Solutions

Analysis of rotordynamic forces for high inlet pre-swirl rate labyrinth seals

Evaluation of Rotordynamic Stability of a Steam Turbine Due to Labyrinth Seal Force

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