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Research Papers: Gas Turbines: Turbomachinery

Numerical Investigations on the Sealing Effectiveness of Turbine Honeycomb Radial Rim Seal

[+] Author and Article Information
Jun Li

Professor
Institute of Turbomachinery,
Xi'an Jiaotong University,
No. 28 Xianning West Road,
Xi'an 710049, China;
Collaborative Innovation Center
of Advanced Aero-Engine,
Beijing 100191, China
e-mail: junli@mail.xjtu.edu.cn

Qing Gao

Institute of Turbomachinery,
Xi'an Jiaotong University,
No. 28 Xianning West Road,
Xi'an 710049, China;
Energy Saving Center,
Xi'an Thermal Power Research
Institute Company Limited,
Xi'an 710032, China
e-mail: leopard.gao@stu.xjtu.edu.cn

Zhigang Li

Institute of Turbomachinery,
Xi'an Jiaotong University,
No. 28 Xianning West Road,
Xi'an 710049, China
e-mail: zhigangli@mail.xjtu.edu.cn

Zhenping Feng

Institute of Turbomachinery,
Xi'an Jiaotong University,
No. 28 Xianning West Road,
Xi'an 710049, China
e-mail: zpfeng@mail.xjtu.edu.cn

1Corresponding author.

Contributed by the Turbomachinery Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received April 19, 2015; final manuscript received February 18, 2016; published online April 26, 2016. Assoc. Editor: Jerzy T. Sawicki.

J. Eng. Gas Turbines Power 138(10), 102601 (Apr 26, 2016) (16 pages) Paper No: GTP-15-1134; doi: 10.1115/1.4033139 History: Received April 19, 2015; Revised February 18, 2016

This paper presented a numerical comparison of the sealing performance between conventional radial rim seal and new-designed honeycomb radial rim seal with three sealing flow rates. Three-dimensional unsteady Reynolds-averaged Navier–Stokes (URANS) equations, coupled with a fully developed shear stress transport (SST) turbulent model from ansys-cfx, were utilized to investigate the sealing effectiveness of rim seal and flow characteristics in the wheel-space of gas turbines. First, the numerical method for analysis the sealing performance of the rim seal was validated on the basis of published experimental data. Pressure distributions on the vane hub, sealing effectiveness distributions on the stator disk surface and swirl ratio distributions in the wheel-space of the experimental models were numerically computed and compared to the experimental data. The additional scalar variable was adopted in calculation to simulate the distribution of tracer gas concentration in experiment. The numerical results were in excellent agreement with experimental data. Then the sealing effectiveness of conventional and new-designed honeycomb radial rim seal are compared. The flow field in the wheel-space of the new-designed honeycomb and conventional turbine radial rim seal was illustrated and analyzed. Furthermore, three cases with different honeycomb cell depths were selected to investigate the influence of honeycomb cell depth on sealing performance of honeycomb radial rim seal. Compared with conventional radial rim seal, the honeycomb radial rim seal could improve the sealing effectiveness by 9–14% at the same sealing flow rate. The honeycomb cell depth has a pronounced effect on sealing performance of honeycomb radial rim seal. It shows that sealing effectiveness of the honeycomb radial rim seal increases with the increase of the honeycomb cell depth, as honeycomb cell depth increases from 1.6 mm to 4.8 mm, the sealing effectiveness is increased by about 8% at most. In addition, the flow pattern of the rim seal and wheel-space is provided to describe sealing flow characteristics.

Copyright © 2016 by ASME
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Figures

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Fig. 1

Computational grid of the experimental rim seal

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Fig. 2

Interface definition of the computational domain of the rim seal

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Fig. 3

Static pressure coefficients distribution at the vane hub of the experimental rim seal

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Fig. 4

Sealing effectiveness distribution along the radial direction of the stator disk

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Fig. 5

Swirl ratio distribution along the radial direction in the wheel space

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Fig. 6

Sealing effectiveness εc variation with sealing flow rateCw

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Fig. 7

Geometrical profile of the honeycomb radial rim seal

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Fig. 8

Three-dimensional structure and boundary flow condition definition of the honeycomb radial rim seal

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Fig. 9

computational grids of the honeycomb radial rim seal

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Fig. 10

Periodic variation of mass flow, pressure, and sealing effectiveness at monitoring points

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Fig. 11

Variation of εc with Cw of the honeycomb and conventional radial rim seals

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Fig. 12

Time-averaged sealing effectiveness contours distribution at the stator disk surface

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Fig. 13

Time-averaged sealing effectiveness contours distribution at the rotor disk surface

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Fig. 14

Time-averaged sealing effectiveness contours distribution in the wheel-space

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Fig. 15

sealing effectiveness distribution along the radial direction of stator and rotor disk surface of the honeycomb and conventional radial rim seals

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Fig. 16

Time-averaged static pressure contours distribution at the stator disk surface

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Fig. 17

Static pressure coefficient distribution along the radial direction of the honeycomb and conventional radial rim seal

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Fig. 18

Sealing effectiveness contours and vectors of the honeycomb and conventional radial rim seal

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Fig. 19

Velocity distributions of the honeycomb and conventional radial rim seals

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Fig. 20

Swirl ratio distribution along the radial direction of the honeycomb and conventional radial rim seal

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Fig. 21

Sealing effectiveness variation with different honeycomb cell depth of the honeycomb radial rim seal

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Fig. 22

Time-averaged sealing effectiveness contours distribution at the stator disk surface with different honeycomb cell depths

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Fig. 23

Sealing effectiveness contours and vectors of the honeycomb radial rim seal with different honeycomb cell depths

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Fig. 24

Velocity distributions of the honeycomb radial rim seal with different honeycomb cell depths

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