Influence of Friction on the Blow-Down Behavior of an Aramid Fiber Brush Seal

Ruggiero, Eric J.

doi:10.1115/gt2012-69329

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…Franceschini et al 20 developed a large radial movement brush seal to accommodate a much larger range of rotor excursion avoided excessive bristles wear. Ruggiero 21 reported that the grooves in upstream cover plate could enhance the bristle blow-down in an aramid fiber brush seal.…”

Section: Literature Reviewmentioning

confidence: 99%

Investigation into the flow behavior of multi-stage brush seals

Qiu

Yan

2014

Proceedings of the Institution of Mechanical Engineers, Part A:

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Brush seals have found increasing use in turbomachinery within the past decade due to their superior sealing performance and flexible nature. The flow characteristics and fundamental behavior of single brush seal are known. However, the flow behavior of multi-stage brush seal combined with labyrinth teeth still requires further research. This article presents a detailed investigation into flow behavior of multi-stage brush seal combined with labyrinth teeth for turbine applications. The leakage rate through a two-stage brush seal combined with labyrinth teeth was measured using the rotating test rig at three operating clearances and four rotational speeds. The leakage rate through the seal was also numerically predicted using Reynolds-averaged Navier–Stokes solutions coupled with non-Darcian porous medium approach. To predict the seal leakage more accurately, the clearance reduction resulted from rotor centrifugal growth was considered in brush seal flow calculations. The effects of rotational speeds and sealing clearance on the leakage performance of the two-stage brush seal were evaluated based on the experimental and numerical results. In addition, to obtain an insight into flow mechanisms of multi-stage brush seals, the leakage rate, flow field, pressure distribution of bristle pack, and aerodynamic force acting on bristle pack of four different types of multi-stage brush seals were also analyzed and compared.

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Section: Literature Reviewmentioning

confidence: 99%

Investigation into the flow behavior of multi-stage brush seals

Qiu

Yan

2014

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…To overcome the abrasive nature and undesired structural effect of bristles, novel materials have been studied. 12,13 However, Haynes 25 is still preferred for steam turbine brush seals where high temperature tolerance and resilient bristles are needed. 14 Heat generation effects arising from friction were investigated numerically 15 and experimentally, suggesting a theoretical heat generation model.…”

Section: Introductionmentioning

confidence: 99%

Estimation of the rotordynamic characteristics of a single brush seal using least-squares and instrumental variable methods under super-heated steam environment

Byun

et al. 2020

Advances in Mechanical Engineering

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The exact understanding of the dynamic characteristic of the seal is a crucial parameter for designing the system. This article presents an experiment that estimates the dynamic characteristics of a brush seal under a super-heated steam environment for a steam turbine. The super-heated steam facility makes super-heated steam (523.15 K) to replicate the real steam turbine environment. Two brush seal units are utilized with a housing connected by springs to measure the modal parameters of the system. To extract the brush seal characteristics, the modal parameters of the pure housing were subtracted from the overall dynamic system. Moreover, to predict modal parameters more accurately, the least-squares method and the instrumental variable method were used to reduce the noise caused by the steam. Two major effects were experimentally investigated by varying the operating speed (0–16,900 r/min) of the rotor and the injection flow of super-heated steam. The results showed that the direct stiffness and damping of the brush seal increased significantly when the steam was injected. Under steam exposure, obtaining the modal parameters using instrumental variable method was confirmed to reduce more noise than obtaining the parameters via least-squares method.

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Influence of Friction on the Blow-Down Behavior of an Aramid Fiber Brush Seal

Cited by 2 publications

References 12 publications

Investigation into the flow behavior of multi-stage brush seals

Investigation into the flow behavior of multi-stage brush seals

Estimation of the rotordynamic characteristics of a single brush seal using least-squares and instrumental variable methods under super-heated steam environment

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