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

Li, J; Obi, Shinnosuke; Feng, Zhenping

doi:10.1243/09576509jpe772

Cited by 12 publications

(8 citation statements)

References 23 publications

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“…In this paper, the calibrated permeability coefficients are adopted to analyze the effects of geometry in the flow fields of the brush seal. The flow model is investigated by adopting the Reynoldsaveraged Navier-Stokes solutions (RANS) coupled with a non-Darcian porous medium approach with a defined resistance flow [24,25]. Figure 4 shows the computational model of the brush seal.…”

Section: Verification Of Methodsmentioning

confidence: 99%

Influence of Geometry on Rotordynamic Coefficients of Brush Seal

Yuan

Dowell

Chen

et al. 2017

International Journal of Turbo &Amp; Jet-Engines

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It has been observed that the geometry of a brush seal has a significant effect on the sealing performance. However, the relationship between rotordynamic coefficients and geometry factors of the brush seal itself are rarely considered. In this article, the rotordynamic coefficients of a typical single-stage brush seal for different geometries and operating conditions were numerically analyzed using CFD RANS solutions coupled with a non-Darcian porous medium model. The reaction force which plays an essential role in rotordynamic coefficients was obtained by integrating the dynamic pressure distribution. The influence of the bristle pack thickness, fence height, clearance size and other working condition parameters on aerodynamic force, stiffness coefficients, and damping coefficients of brush seal were presented and compared. In addition, the effects of various geometric configurations on pressure and flow features were also discussed.

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Section: Verification Of Methodsmentioning

confidence: 99%

Influence of Geometry on Rotordynamic Coefficients of Brush Seal

Yuan

Dowell

Chen

et al. 2017

International Journal of Turbo &Amp; Jet-Engines

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“…Li et al [7] utilized the RANS equations and the non-Darcian porous medium model solver to investigate the effect of the clearance sizes on the leakage flow characteristics of the labyrinth brush seal for turbomachinery.…”

Section: Literature Reviewmentioning

confidence: 99%

“…(4)- (7). The viscous and inertial resistance coefficients {a^ and bs) in the bristles' lengthwise direction are modified to account for anisotropy and match the experimental data [16] 66.67 (1 -…”

Section: Calibration Of the Brush Seal Porosity And Resistance Coeftimentioning

confidence: 99%

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Experimental and Numerical Investigations on the Leakage Flow Characteristics of the Labyrinth Brush Seal

Qiu

Feng

2012

Journal of Engineering for Gas Turbines and Power

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The leakage rate of the labyrinth brush seal was experimentally measured and numerically investigated in this paper. Eour different rotational speeds of 0, 1500, 2400 and 3000 rpm were utilized to investigate the effects on the leakage rate of the labyrinth brush seal. In addition, five different pressure ratios and two initial clearances were also adopted to study the influences of pressure ratio and clearance size on the leakage rate of the labyrinth brush seal. The leakage rates of the experimental labyrinth brush seal at different rotational speeds, pressure ratios, and initial clearances were also predicted using Reynolds-averaged Navier-Stokes (RANS) solutions coupling with a non-Darcian porous medium model. The rotor centrifugal growth and bristle blow-down effects were considered in the present numerical research. The rotor centrifugal growth at different rotational speeds was calculated using the finite element method (EEM). The variation of the sealing clearance size with rotor centrifugal growth and bristle blow-down was analyzed. The numerical leakage rate was in good agreement with the experimental data. The effects of rotational speeds, pressure ratios, and clearance sizes on the leakage flow characteristics of brush seals were also investigated based on the experimental data and numerical results. The detailed leakage flow fields and pressure distributions of the brush seals were also presented.

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“…Once passed the choking zone, flow is exposed to throttling between cloth weave and downstream slot surface, and subject to resistance through voids inside the cloth weave placed near downstream. Several studies investigate the impact of geometric dimensions and boundary conditions on rim, brush and laby-brush seal leakage performance [19][20][21][22]. A comprehensive study is needed to understand how cloth seal leakage performance is affected by geometric dimensions under varying pressure load.…”

Section: Introductionmentioning

confidence: 99%

A Study of Cloth Seal Leakage Performance Based on Geometry and Pressure Load

2020

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Metal cloth seals have been used increasingly in gas turbines due to their flexibility and superior leakage performance. Leakage performance of a metal cloth seal depends on operating conditions, slot and geometric dimensions. These parameters need to be investigated for the best leakage performance. In this study, pressure drop and critical geometric parameters of typical cloth seal form are investigated with an experimental setup. Slot depth, cloth width, sealing gap, shim thickness, surface roughness, pressure drop, offset and mismatch are selected parameters for the screening experiments. Sixteen experiments were conducted following a two-level Resolution IV fractional factorial experiment design for eight parameters. The results indicated that strong parameters for the leakage performance are pressure drop, cloth width, slot depth and offset. Leakage rate is increased with an increase in slot depth, gap, shim thickness, pressure drop and mismatch. During screening experiments, the experiment with minimum flow rate has 86% lower leakage rate than the experiment with maximum flow rate. For main experiments, a Box-Behnken experiment design is applied to analyze nonlinear effects of four strong parameters on the leakage rate. A closed-form equation is derived based on the data and presented in this study.

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

Cited by 12 publications

References 23 publications

Influence of Geometry on Rotordynamic Coefficients of Brush Seal

Influence of Geometry on Rotordynamic Coefficients of Brush Seal

Experimental and Numerical Investigations on the Leakage Flow Characteristics of the Labyrinth Brush Seal

A Study of Cloth Seal Leakage Performance Based on Geometry and Pressure Load

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