Evaluation of Flow Behavior for Clearance Brush Seals

Doğu, Yahya; Akşit, Mahmut Faruk; Demiroglu, Mehmet; Dinç, O. S.

doi:10.1115/1.2770479

Cited by 17 publications

(11 citation statements)

References 31 publications

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“…5. The present results are compared with those of experimental data and the numerical results of Turner et al [9] and Dogu et al [21]. The present numerical results are well in agreement with the experimental data of the blow-down operation model.…”

Section: Validation Of Numerical Approachsupporting

confidence: 94%

The effects of clearance sizes on labyrinth brush seal leakage performance using a Reynolds-averaged Navier—Stokes solver and non-Darcian porous medium model

Obi

Feng

2009

Proceedings of the Institution of Mechanical Engineers, Part A:

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Effects of clearance sizes on the pressure and leakage characteristics in a shaft labyrinth brush seal were numerically investigated using Reynolds-averaged Navier-Stokes (RANS) and non-Darcian porous medium model solutions. The leakage flow characteristics in the referenced design shaft labyrinth seal of turbomachinery was initially studied using the RANS solution. The initial shaft labyrinth seal was redesigned into the multi-stage labyrinth brush seal. The reliability and accuracy of the RANS and the non-Darcian porous medium model for leakage flow in brush seals were demonstrated through comparison of the experimental data. Then, the leakage flowrate of the redesigned shaft labyrinth brush seal was calculated at four sizes of bristle pack tip clearances (0, 0.1, 0.3, and 0.5 mm) and compared with the referenced shaft labyrinth seal. The numerical results show that the leakage flowrate increases rapidly with increasing clearance between the bristle pack tip and the rotor surface for the shaft labyrinth brush seal. The leakage flow pattern in the referenced labyrinth seal and the redesigned shaft labyrinth brush seal was also illustrated.

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Section: Validation Of Numerical Approachsupporting

confidence: 94%

The effects of clearance sizes on labyrinth brush seal leakage performance using a Reynolds-averaged Navier—Stokes solver and non-Darcian porous medium model

Obi

Feng

2009

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…Dogu et al. 12,13 employed their modified bulk porous medium approach to investigate the leakage flow behaviors of the contact and clearance brush seals. Pugachev and Helm 14 presented a method of calibrating porous medium models for brush seals by varying bristle pack thickness to match the experimental data.…”

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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“…After some service hours, the bristle wear is excessive and the bristle blow-down cannot maintain the bristle-rotor contact. The brush seal will inevitably operate with some clearance, and the leakage will significantly increase [3]. In addition, the initial build interference and bristle blow-down effect may result in excessive frictional heat.…”

Section: Introductionmentioning

confidence: 98%

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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Evaluation of Flow Behavior for Clearance Brush Seals

Cited by 17 publications

References 31 publications

The effects of clearance sizes on labyrinth brush seal leakage performance using a Reynolds-averaged Navier—Stokes solver and non-Darcian porous medium model

The effects of clearance sizes on labyrinth brush seal leakage performance using a Reynolds-averaged Navier—Stokes solver and non-Darcian porous medium model

Investigation into the flow behavior of multi-stage brush seals

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

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