Flow visualization and motion analysis for a series of four sequential brush seals

Braun, M. J.; Canacci, Victor A.; Hendricks, R. C.

doi:10.2514/6.1990-2482

Cited by 11 publications

(6 citation statements)

References 4 publications

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“…Coking may result in generation of carbon deposits that stick on the blades of the compressor causing performance degradation as well as increased maintenance cost. Early studies of brush seals in liquid flow were performed by Braun et al [3][4][5][6]. Carlile et al [7] and Hendricks et al [8] have studied brush leakage performance with liquid helium and have reported improved performance when a lubricant is applied to the bristles.…”

Section: Introductionmentioning

confidence: 99%

Non-Metallic Brush Seals for Gas Turbine Bearings

Bhate

Thermos

Akşit

et al. 2004

Volume 4: Turbo Expo 2004

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A non-metallic brush seal has been developed as an oil seal for use in turbomachinary. Traditionally labyrinth-type seals with larger clearances have been used in such applications. Labyrinth seals have higher leakage rates and can undergo excessive wear in case of rotor instability. Brush seals reduce leakage by up to an order of magnitude and provide compliance against rotor instabilities. Brush seals are compact and are much less prone to degradations associated with oil sealing. This paper describes the benefits and development of the non-metallic brush seals for oil sealing application.

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Section: Introductionmentioning

confidence: 99%

Non-Metallic Brush Seals for Gas Turbine Bearings

Bhate

Thermos

Akşit

et al. 2004

Volume 4: Turbo Expo 2004

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“…Gunter and Shaw (16) The unique feature of brush seals is that most of the flow friction surface lies within the brush itself and the other areas are usually less than 10 percent of the total area. fl was estimated from flow observations associated with Braun et al (11).…”

Section: Bulk Flow Modelmentioning

confidence: 99%

A Bulk Flow Model of a Brush Seal System

Hendricks

Schlumberger

Braun

et al. 1991

Volume 1: Turbomachinery

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Fibers such as fabric and bristles can be readily fabricated into a variety of seal configurations that are compliant and responsive to high speed or lightly loaded systems. A linear, circular, or contoured brush seal system is a contact seal consisting of the bristle pattern and hardened interface. When compared to a labyrinth seal the brush seal system is superior and features low leakage, dynamic stability, and permits compliant structures. But in turn the system usually requires a hardened smooth interface, permits only limited pressure drops. Wear life and wear debris for operations with static or dynamic excitation are largely undetermined. A seal system involves control of fluid within specific boundaries. The brush and rub ring (or rub surface) form a seal system. In this paper, design similitudes, a bulk flow model, and rub ring (interface) coatings are discussed. The bulk flow model calculations are based on flows in porous media and filters. The coatings work is based on our experience and expanded to include current practice.

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“…1A. Recently, amongst others, Chupp(1991a) and Braun et al(1990aBraun et al( , 1992 have published extensive experimental information concerning the nature of the flow and pressure drops in a brush, and advanced theoretical formulations that explain the physical concept of sealing and the functionality of the brush seal (Braun et al, 1990b).…”

mentioning

confidence: 99%

“…Applying the Full Flow Field Tracking(FFFT) method, Braun et al(1990aBraun et al( , 1992 studied non-intrusively the fundamental flow patterns and reconstructed graphically the fluid velocities inside a cascade of brushes. The flow field that was visualized by means of a light sheet, and FFFT, revealed regions that are characteristically river jetting, vortical, crossflow, and exist upstream, downstream or within the seal.…”

mentioning

confidence: 99%

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A Numerical Simulation of a Brush Seal Section and Some Experimental Results

Braun

Kudriavtsev

1993

Volume 3C: General

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The brush seal technology represents quite a promising advance in the effort of construction of more efficient, and possibly smaller size engines. Conclusions of recent workshops determined that while the brush seals works well, there is a need to improve its performance characteristics. The considerable amount of experimental work performed to date has indicated the importance of the local flow phenomena in the global sealing process performance of the brush (Braun et al., 1990a, 1991b, 1992, Hendricks et al., 1991a). The distributed flow and pressure fields are thus of vital importance for the prediction of the possible sudden failure of the brush seal under unexpected local “pressure hikes”. It is in this context that the authors developed a numerical, two dimensional time dependent formulation of the Navier-Stokes equations with constant properties, and included the effects of inertia, viscous and pressure terms. The algorithm is applied to a set of non-compliant multirow, multicolumn pin configurations that are similar to the ones found in an idealized brush seal configuration. While the numerical parametric investigation aims to establish the occurrence of major flow patterns and associated pressure maps, the experimental portion of the paper is aimed at gaining further insight into the relevant flow structures, and thus guide the development of the mathematical and numerical model.

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Flow visualization and motion analysis for a series of four sequential brush seals

Cited by 11 publications

References 4 publications

Non-Metallic Brush Seals for Gas Turbine Bearings

Non-Metallic Brush Seals for Gas Turbine Bearings

A Bulk Flow Model of a Brush Seal System

A Numerical Simulation of a Brush Seal Section and Some Experimental Results

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