Brush seals and labyrinth seals in gas turbine applications

Aslan-zada, F; Mammadov, Vugar A; Dohnal, Fadi

doi:10.1177/0957650912464922

Cited by 36 publications

(29 citation statements)

References 52 publications

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“…Solution: Firstly, SCR is calculated as 0.01, using equation (1). Secondly, from Figure 8(a), CGR is obtained as 0.029 for the given speed, which corresponds to a centrifugal growth of 14 mm.…”

Section: Design Guidelines and Proceduresmentioning

confidence: 99%

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On the choice of initial clearance and prediction of leakage flow rate for a rotating gas turbine seal

Subramanian

Sekhar

Prasad

2015

Proceedings of the Institution of Mechanical Engineers, Part C:

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The present work proposes a design procedure along with guidelines for the choice of initial clearance of a typical rotating gas turbine seal in a secondary air system. The basis for the design is to prevent seal rubbing against stator, by ensuring that the centrifugal and thermal growths of the seal are within the safe operating limits. As a case study, a six-tooth straight-through rotating labyrinth seal configuration is considered with wide ranging seal parameters, namely the seal inner radius (25-700 mm), speed (1000-5000 rad/s), temperature (200-650 C) and pressure ratio (1.1-2.5). By means of an iterative process, which involves computational fluid dynamics and finite element analysis techniques, and with a choice of initial clearance, an extensive database is generated. The results are presented in terms of nondimensional variables, namely seal clearance ratio, centrifugal growth ratio, thermal growth ratio, operating clearance ratio due to centrifugal growth and operating clearance ratio due to thermal growth. It is found that the value of clearance ratio depends significantly on the dimensionless radial position. For a seal clearance ratio of 0.01, at 3000 rad/s, the leakage flow rate gets reduced by 18 and 4%, respectively for pressure ratios of 1.1 and 2.5, when the centrifugal growth alone is considered. When both centrifugal and thermal growths are considered, the percentage reduction becomes about 70% for the same seal operating at 3000 rad/s and 204 C, and it is as high as 95% at 426 C.

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Section: Design Guidelines and Proceduresmentioning

confidence: 99%

“…1 Seals help in reducing air leakage and provide control over the secondary air for cooling the critical components in a predesigned manner. When the engine is in operation, the seals are subjected to mechanical loads due to high rate of rotation and thermal loads due to elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

On the choice of initial clearance and prediction of leakage flow rate for a rotating gas turbine seal

Subramanian

Sekhar

Prasad

2015

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Therefore, the similar feed velocities are recommended among different sectors, while steady conversion patterns are preferred to minimize the pressure field variation within the reactor. Effective sealing systems (brush seals, labyrinth seals [28]) from gas turbines can be readily adapted to the rotary reactor to avoid the spinning-driven dilution between the fuel and the air zones.…”

Section: Carbon Separationmentioning

confidence: 99%

“…The residual metal oxide in the OC also controls carbon deposition risk in the fuel sector. Thus, the size of the fuel sector should satisfy: (28) On the other hand, the size of the air sector should be large enough such that the OC on the walls are sufficiently exposed to and re-oxidized by the flowing air. Complete oxidation of the OC may not be necessary due to the fact that the oxidation rate may decrease significantly as the OC approaches complete oxidation state, as noted in Part 2.…”

Section: Design Parametersmentioning

confidence: 99%

Design of a rotary reactor for chemical-looping combustion. Part 1: Fundamentals and design methodology

Zhao

Iloeje

Chen

et al. 2014

Fuel

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Chemical-looping combustion (CLC) is a novel and promising option for several applications including carbon capture (CC), fuel reforming, H 2 generation, etc. Previous studies demonstrated the feasibility of performing CLC in a novel rotary design with micro-channel structures. In the reactor, a solid wheel rotates between the fuel and air streams at the reactor inlet, and depleted air and product streams at exit. The rotary wheel consists of a large number of micro-channels with oxygen carriers (OC) coated on the inner surface of the channel walls. In the CC application, the OC oxidizes the fuel while the channel is in the fuel zone to generate undiluted CO 2 , and is regenerated while the channel is in the air zone. In this two-part series, the effect of the reactor design parameters is evaluated and its performance with different oxygen carriers (OC) is compared. In Part 1, the design objectives and criteria are specified and the key parameters controlling the reactor performance are identified. The fundamental effect of the OC  Corresponding author. Tel.: +1 617 253 2295. E-mail address: ghoniem@mit.edu (A.F. Ghoniem) 2 characteristics, the design parameters, and the operating conditions are studied. The design procedures are presented on the basis of the relative importance of each parameter, enabling a systematic methodology of selecting the design parameters and the operating conditions with different OCs. Part 2 presents the application of the methodology to the designs with the three commonly used OCs, i.e., nickel, copper, and iron, and compares the simulated performances of the designs.

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“…Flexible bristles have strong adaptability to the eccentric operation of the rotor. Therefore, brush seals are widely used in turbomachinery (Aslan-zada, 2012;Schur, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Effect of the Fence Height on the Leakage Flow Characteristics of Brush Seals

Zhang¹,

Ma²,

Li³

et al. 2019

Proceedings of Global Power &Amp; Propulsion Society

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Effect of the fence height on the leakage flow characteristics of brush seals is investigated by means of experimental measurements and numerical simulations. The leakage flow rate of brush seal with three sizes of fence height is measured at six rotor surface velocities ranged from 0m/s to 62.8m/s among pressure differences 9.64kPa to 192.8kPa and the working fluid is air. The detailed leakage flow field of the experimental brush seals is numerically analyzed using threedimensional Reynolds-Averaged Navier-Stokes (RANS) and SST turbulence model based on the Non-Darcian porous medium. The accuracy of the numerical method is validated by comparison of experimental data. The obtained results show that the effective clearance of brush seal decreases with the fence height decreases at the fixed rotor surface velocity and pressure difference. The effective clearance of brush seal with three sizes fence height increases significantly with the increases of pressure differences at the fixed rotor surface velocity. The effective clearance of interference brush seals slightly decrease with the increasing rotor surface velocity due to the friction heat generation. Effect of the rotor surface velocity on the effective clearance of brush seal is limited when the bristles wear and friction heat generation is not considered. The detailed leakage flow field of the brush seal is also illustrated.

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Brush seals and labyrinth seals in gas turbine applications

Cited by 36 publications

References 52 publications

On the choice of initial clearance and prediction of leakage flow rate for a rotating gas turbine seal

On the choice of initial clearance and prediction of leakage flow rate for a rotating gas turbine seal

Design of a rotary reactor for chemical-looping combustion. Part 1: Fundamentals and design methodology

Effect of the Fence Height on the Leakage Flow Characteristics of Brush Seals

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