Analysis of Contact Mechanics for Rotor-Bristle Interference of Brush Seal

Stango, R. J.; Zhao, Huan; Shia, Chih-Yuan

doi:10.1115/1.1510879

Cited by 25 publications

(12 citation statements)

References 7 publications

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“…Numerical results show a big increase in bristle-rotor contact force when a pressure differential is utilized. Stango et al [15] calculated the bristle-rotor contact force using the in-plane, large deformation mechanics analysis of a cantilever beam. Results show the bristle lay angle played a crucial role in regulating the magnitude of bristle contact force and bending stress in their conclusions.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigations on the Heat Transfer Behavior of Brush Seals Using Combined Computational Fluid Dynamics and Finite Element Method

Qiu¹,

2013

Journal of Heat Transfer

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Brush seals have been applied in more and more challenging high-temperature locations. The high speed bristle-rotor friction causes a considerable heat generation which accelerates the bristles wear. The frictional heat generation at bristle-rotor interface becomes another major concern in brush seal applications. This study presented detailed investigations on the heat transfer characteristics and contact mechanics of brush seals using a combined computational fluid dynamics (CFD) and finite element method (FEM) brush seal model. The CFD model of brush seal for mass and heat transfer employed Reynoldsaveraged Navier-Stokes (RANS) solutions coupled with non-Darcian porous medium approach. The nonlinear contact model of brush seal was established using FEM with considerations of internal frictions (bristle to rotor, bristle to backing plate, and bristle to bristle) and aerodynamic loads on bristles. The numerical method involved iterations between CFD and FEM models to better evaluate the heat transfer behaviors of the brush seal with consideration of bristle deflections. The frictional heat generation was calculated from the product of bristle-rotor frictional force and sliding velocity. The bristle deflections and temperature distributions of the brush seal were predicted at various operational conditions using the iterative CFD and FEM brush seal model. The effects of pressure differential and rotational speed on the contact behavior, temperature distribution and bristle maximum temperature of brush seals were numerically investigated using the developed approach. The detailed pressure contours and streamline distributions of the brush seal were also illustrated.

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Section: Introductionmentioning

confidence: 99%

Numerical Investigations on the Heat Transfer Behavior of Brush Seals Using Combined Computational Fluid Dynamics and Finite Element Method

Qiu¹,

2013

Journal of Heat Transfer

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“…Basu et al [4] experimentally verified that the contact force between the bristles and rotor would increase after being exposed to the airflow, which causes the adverse bristle stiffness and reduces the service life of the brush seal. Stango et al [5] and Zhao et al [6,7] analyzed the contact force model between the bristle-rotor under different interferences in a two-dimensional plane and analyzed the effect of the bristles' geometric parameters on the contact force. Sun [8] investigated the bristle deflections and mechanical behavior based on the fluid-structure interaction model and conducted the experimental validation.…”

Section: Introductionmentioning

confidence: 99%

Effects of Front Plate Geometry on Brush Seal in Highly Swirling Environments of Gas Turbine

et al. 2021

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Advanced brush seal technology has a significant impact on the performance and efficiency of gas turbine engines. However, in highly inlet swirling environments, the bristles of a brush seal tend to circumferentially slip, which may lead to aerodynamic instability and seal failure. In this paper, seven different front plate geometries were proposed to reduce the impact of high inlet swirl on the bristle pack, and a three-dimensional porous medium model was carried out to simulate the brush seal flow characteristics. Comparisons of a plane front plate with a relief cavity, plane front plate with axial drilled holes, anti-“L”-type plate and their relative improved configurations on the pressure and flow fields as well as the leakage behavior were conducted. The results show that the holed front plate can effectively regulate and control the upstream flow pattern of the bristle pack, inducing the swirl flow to move radially inward, which results in decreased circumferential velocity component. The anti-“L” plate with both axial holes and one radial hole was observed to have the best effect on reducing the swirl of those investigated. The swirl velocity upstream the bristle pack can decline 50% compared to the baseline model with plane front plate, and the circumferential aerodynamic forces on the bristles, which scale with the swirl dynamic head, are reduced by a factor of 4. This could increase the bristle stability dramatically. Moreover, the front plate geometry does not influence the leakage performance significantly, and the application of the axial hole on the front plate will increase the leakage slightly by around 3.5%.

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“…Both vertical load and axial load were introduced in their research, but it was time-consuming for coding and hard to achieve for engineers. 16 Cicone and Pascovici presented a nonlinear model to determine bristle deformation. They also evaluated the small deformation beam models from published articles.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and numerical investigation into brush seal hysteresis without pressure differential

Kang

Liu

et al. 2019

Advanced Composites Letters

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Brush seal is a novel type contact seal, and it is well-known due to its excellent performance. However, there are many intrinsic drawbacks, such as hysteresis, which need to be solved. This article focused on modeling hysteresis in both numerical way and analytic way without pressure differential. The numerical simulation was solved by the finite element method. General contact method was used to model the inter-bristle contact, bristle-rotor contact, and bristle-backplate contact. Bristle deformation caused by both vertical and axial tip force was used to validate the numerical model together with reaction force. An analytic model in respect of the strain energy was created. The influence of structure parameters on the hysteresis ratio, with the emphasis on the derivation of hysteresis ratio formula for brush seals, was also presented. Both numerical model and analytic model presented that cant angle is the most influential factor. The aim of the article is to provide a useful theoretical and numerical method to analyze and predict the hysteresis. This work contributes the basis for future hysteresis investigation with pressure differential.

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Analysis of Contact Mechanics for Rotor-Bristle Interference of Brush Seal

Cited by 25 publications

References 7 publications

Numerical Investigations on the Heat Transfer Behavior of Brush Seals Using Combined Computational Fluid Dynamics and Finite Element Method

Numerical Investigations on the Heat Transfer Behavior of Brush Seals Using Combined Computational Fluid Dynamics and Finite Element Method

Effects of Front Plate Geometry on Brush Seal in Highly Swirling Environments of Gas Turbine

Theoretical and numerical investigation into brush seal hysteresis without pressure differential

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