Interactive Development of Seals, Bearings, andSecondary Flow Systems with the Power Stream

Hendricks, R. C.; Steinetz, Bruce M.; Athavale, M. M.; Przekwas, A. J.; Braun, M. J.; Dozozo, M. I.; Choy, F. K.; Kudriavtsev, V. V.; Mullen, Robert L.; Pragenau, G. L. Von

doi:10.1155/s1023621x95000054

Cited by 9 publications

(6 citation statements)

References 18 publications

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“…3). The experimental setup consists of a stepped rotor (4), casing (5), flexible coupling (7), flexible supports (1, 2, 3, 6, 10, and 11), high speed angular contact ball bearings (3 and 6), and the motor (9). The stiffness and damping of the support structure can be changed by adjusting the length of the support beams.…”

Section: Methodsmentioning

confidence: 99%

“…Some numerical studies are available in the literature for the calculation of the rotordynamic coefficients (added mass, stiffness, and damping terms), including the inertia effects [8][9][10][11]. Coupling this approach to a structural model could be cumbersome, because the fluid numerical model should be applied for different geometries and material properties to obtain the fluid forces and, as a result, the rotordynamic coefficients.…”

Section: Introductionmentioning

confidence: 99%

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Flow-Induced Instability on High-Speed Mini Rotors in Laminar Flow

Dikmen¹,

Hoogt²,

Boer

et al. 2013

Journal of Vibration and Acoustics

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In this study, a modeling approach is developed to examine laminar flow effects on the rotordynamic behavior of high-speed mini rotating machinery with a moderate flow confinement. The existing research work mostly focuses on the flow-induced forces in small gap systems, such as bearings and seals, in which the flow is mostly laminar and inertia effects are ignored. In other studies, medium gap systems are analyzed, taking the inertia effects into consideration, but the surrounding flow is considered as turbulent. However, in high speed mini rotating machinery, the large clearances and the high speeds make the inertia effects significant, even in the laminar flow regime. In the current study, the flow-induced forces resulting from the surrounding fluid are analyzed and these models are combined with the structural finite element (FE) models for determining the rotordynamic behavior. The structure is analyzed with finite elements based on Timoshenko beam theory. Flow-induced forces, which include inertia effects, are implemented into the structure as added mass-stiffness-damping at each node in the fluid confinement. The shear stress is modeled with empirical and analytical friction coefficients, and the stability, critical speeds, and vibration response of the rotor is investigated for different friction models. In order to validate the developed modeling approach, experiments were conducted on a specially designed setup at different support properties. By comparing the experiments with the theoretical models, the applicability of the different friction models are examined. It was found that the dynamic behavior is estimated better with empirical friction models compared to using the analytical friction models.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flow-Induced Instability on High-Speed Mini Rotors in Laminar Flow

Dikmen¹,

Hoogt²,

Boer

et al. 2013

Journal of Vibration and Acoustics

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“…Compliant foil gas seal was one of the advanced cylindrical gas seals and first introduced by Mohsen and Heshmat [5]. It can be used to reduce leakage in extremely small gaps of the secondary flow system of the areo-engine, including in compressors, turbine, and even other turbomachinery [6,7]. The compliant foil gas seal can increase the seal efficiency and reliability of the aero-engine, and its main role is flexible ability in dynamic deformation [6].…”

Section: Introductionmentioning

confidence: 99%

“…It can be used to reduce leakage in extremely small gaps of the secondary flow system of the areo-engine, including in compressors, turbine, and even other turbomachinery [6,7]. The compliant foil gas seal can increase the seal efficiency and reliability of the aero-engine, and its main role is flexible ability in dynamic deformation [6]. Therefore, the numerical evaluation of the compliant foil gas seal is analyzed in this paper, and it is beneficial to predict the performance of the compliant foil gas seal in a complex environment by meeting the steady requirements of the gas seal.…”

Section: Introductionmentioning

confidence: 99%

Numerical Evaluation of Rotordynamic Coefficients for Compliant Foil Gas Seal

et al. 2020

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Compliant foil gas seal is one of the advanced cylindrical gas seal technologies and can be commonly used in the secondary flow system of an aero-engine. It can enhance the dynamic stability of the aero-engine by meeting the steady requirements of the aero-engine seal system. To evaluate the performance of compliant foil gas seal, the steady performance of the gas seal is firstly analyzed to predict the sealing efficiency and obtain the pressure distribution of the gas seal in the compressible flow field. Then, the effects of the operating parameters on the rotordynamic coefficients are analyzed using the finite differential method. It can be used to predict the operation performance of the aero-engine and prepare for the optimization and test rig of compliant foil gas seal on the T-shaped groove.

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“…Agreement between experimental evidence and numerical results for single cavities can provide good first order estimates of mass, heat, and momentum distributions. (Hendricks, et al, 1994 (a), Chew, others) For multiple cavity experiments such as UTRC simulation of the space shuttle main engine high pressure fuel turbopump (SSME/HPFTP) (Daniels and Johnson 1993) the interactive effects of the power stream and secondary flow streams are simulated. Intercavity feedback affect pressure balancing and stator/blade stage pressures throughout the entire turbomachine.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Intra-Cavity and Power-Stream Flow Interaction in Multiple Gas-Turbine Disk-Cavities

Athavale

Przekwas

Hendricks

et al. 1995

Volume 1: Turbomachinery

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A numerical analysis methodology and solutions of the interaction between the power stream and multiply-connected multi-cavity sealed secondary flow fields are presented. Flow solutions for a multi-cavity experimental rig were computed and compared with experimental data of Daniels and Johnson. The flow solutions illustrate the complex coupling between the main-path and the cavity flows as well as outline the flow thread that exists throughout the subplatform multiple cavities and seals. The analysis also shows that the de-coupled solutions on single cavities is inadequate. The present results show trends similar to the T-700 engine data that suggests the changes in the CDP seal altered the flow fields throughout the engine and affected the engine performance.

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Interactive Development of Seals, Bearings, andSecondary Flow Systems with the Power Stream

Cited by 9 publications

References 18 publications

Flow-Induced Instability on High-Speed Mini Rotors in Laminar Flow

Flow-Induced Instability on High-Speed Mini Rotors in Laminar Flow

Numerical Evaluation of Rotordynamic Coefficients for Compliant Foil Gas Seal

Numerical Analysis of Intra-Cavity and Power-Stream Flow Interaction in Multiple Gas-Turbine Disk-Cavities

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