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Gas Turbines: Structures and Dynamics

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

[+] Author and Article Information
Jun Li

 Institute of Turbomachinery, Xi’an Jiaotong University, Xi’an 710049, Chinajunli@mail.xjtu.edu.cn

Bo Qiu

 Institute of Turbomachinery, Xi’an Jiaotong University, Xi’an 710049, Chinaqiubo.05@stu.xjtu.edu.cn

Zhenping Feng

 Institute of Turbomachinery, Xi’an Jiaotong University, Xi’an 710049, China

J. Eng. Gas Turbines Power 134(10), 102509 (Aug 22, 2012) (9 pages) doi:10.1115/1.4007062 History: Received June 20, 2012; Revised June 23, 2012; Published August 22, 2012; Online August 22, 2012

The leakage rate of the labyrinth brush seal was experimentally measured and numerically investigated in this paper. Four 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 (FEM). 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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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Cross-sectional configuration of the experimental labyrinth brush seal

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Figure 2

Geometrical parameters of the labyrinth brush seal

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Figure 3

Labyrinth brush seal CFD model domain

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Figure 4

Labyrinth brush seal computational grid ((a) brush seal; (b) labyrinth seal)

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Figure 5

Rotor computational grid and centrifugal growth contour ((a) computational grid; (b) centrifugal growth contour)

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Figure 6

Variation of sealing clearance with rotational speed for initial clearances of 0.1 mm and 0.2 mm

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Figure 7

Leakage rate versus pressure ratio

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Figure 8

Variation of the bristle blow-down with pressure ratios for initial clearances of 0.1 mm and 0.2 mm

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Figure 9

Leakage rate versus rotational speed

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Figure 10

Static pressure contours and streamline distributions of the labyrinth brush seal with 0.2 mm clearance

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Figure 11

Static pressure contours and streamline distributions of the brush seal at a pressure ratio of 1.4 ((a) 0.1 mm clearance; (b) 0.2 mm clearance)

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Figure 12

Pressure distribution along bristle pack ((a) upper and lower surface of the bristle pack, (b) upstream and downstream surface of the bristle pack, (c) pressure distribution along the upper and lower surface, and (d) pressure distribution along the upstream and downstream surface)

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