Advanced Seals for Industrial Turbine Applications: Dynamic Seal Development

Chupp, Raymond E.; Ghasripoor, Farshad; Turnquist, Norman; Demiroglu, Mehmet; Akşit, Mahmut Faruk

doi:10.2514/2.6061

Cited by 56 publications

(22 citation statements)

References 11 publications

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“…Fiber characterization involved evaluation of tensile strength and creep strength as well as wear performance. Importance of fiber properties in brush seal design and conventional design guidelines can be found elsewhere in the literature [14][15][16].…”

Section: Fiber Characterizationmentioning

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: Fiber Characterizationmentioning

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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“…79,80 An extensive summary of brush seal research and development work through 1995 has been published 84,85 and updated in a more recent summary. 40 …”

Section: Brush Sealsmentioning

confidence: 99%

“…With increasing fuel prices and advances in materials to allow extended service periods, abradable seals are gaining popularity within the power generation industry. 40 Without abradable seals, the cold clearances between blade or bucket tips and shrouds must be large enough to prevent significant contact during operation. Use of abradable seals allows the cold clearances to be reduced with the assurance that if contact occurs, the sacrificial part will be the abradable material on the stationary surface and not the blade or bucket tips.…”

Section: B Abradablesmentioning

confidence: 99%

Turbomachinery Clearance Control

Chupp

Hendricks

Lattime

et al. 2014

Turbine Aerodynamics, Heat Transfer, Materials, and Mechanics

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“…Over the years, a large amount of information has been gathered on the long-term behaviour of brush seals as part of maintenance work and regular checks on the condition of the seals. Publications [1][2][3][4][5][6] provide examples of this in extracts. The focus in assessing the seals was primarily on the wear condition and the change in leakage rates over time.…”

Section: Introductionmentioning

confidence: 99%

Contamination of Brush Seals by Oil and Salt and Its Impact on Rubbing and Hysteresis Behaviour

Hildebrandt¹,

Schwitzke²,

Bauer³

2019

IJTPP

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The literature already contains some experimental, analytical and numerical investigations on the rubbing and hysteresis behaviour of brush seals. What the investigations have in common is that they were carried out with new and uncontaminated seals, or that such a condition was assumed. The influence of contamination has not been explicitly investigated yet. Particularly in stationary gas and steam turbines, foreign substances can accumulate on and in the bristle package during steady-state operation. In the case of a rubbing event with a contaminated brush seal, e.g., during shutdown of the machine, the process is not expected to be comparable to that assumed in the presence of a new, uncontaminated seal. The present paper is dedicated to the question of the influence of contamination on the total frictional power loss generated during rubbing and the distribution of heat fluxes in friction contact. For this purpose, rub tests with two seals were carried out on the brush seal test rig of the Institute of Thermal Turbomachinery (ITS) in new conditions. Subsequently, the sealing packages were contaminated with oil or a salt mixture. After the treatment, the rub tests were repeated and compared with the previous tests. In addition, stiffness measurements were used to assess the degree of contamination. A strong influence on the rubbing behaviour by the contamination was detected. Contamination causes the flexibility of the bristle package to be greatly reduced. As a result, especially at the beginning of the first measurements, the total power losses and rotor heat inputs are strongly increased. This flexibility is partly regained in the course of the measurements. As expected, contamination also influences the hysteresis behaviour of the seal. A highly increased leakage rate after rubbing could be observed, because the bristles remained close to their deflected positions. In the case of the salted seal, however, an improvement in the leakage performance could be observed after several repeat tests.

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Advanced Seals for Industrial Turbine Applications: Dynamic Seal Development

Cited by 56 publications

References 11 publications

Non-Metallic Brush Seals for Gas Turbine Bearings

Non-Metallic Brush Seals for Gas Turbine Bearings

Turbomachinery Clearance Control

Contamination of Brush Seals by Oil and Salt and Its Impact on Rubbing and Hysteresis Behaviour

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