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Research Papers: Gas Turbines: Structures and Dynamics

Experimental and Numerical Investigations of Closed Radial Inflow Turbine With Labyrinth Seals

[+] Author and Article Information
Wen Li

Institute of Engineering Thermophysics,
Chinese Academy of Sciences,
11 Beisihuanxi Road,
Beijing 100190, China;
School of Engineering Sciences,
University of Chinese Academy of Sciences,
No. 19(A) Yuquan Road, Shijingshan District,
Beijing 100049, China
e-mail: liwen@iet.cn

Xing Wang

Institute of Engineering Thermophysics,
Chinese Academy of Sciences,
11 Beisihuanxi Road,
Beijing 100190, China
e-mail: wangxing@iet.cn

Xuehui Zhang

Institute of Engineering Thermophysics,
Chinese Academy of Sciences,
11 Beisihuanxi Road,
Beijing 100190, China
e-mail: zhangxuehui@iet.cn

Xinjing Zhang

Institute of Engineering Thermophysics,
Chinese Academy of Sciences,
11 Beisihuanxi Road,
Beijing 100190, China
e-mail: zhangxinjing@iet.cn

Yangli Zhu

Institute of Engineering Thermophysics,
Chinese Academy of Sciences,
11 Beisihuanxi Road,
Beijing 100190, China
e-mail: zhuyangli@iet.cn

Haisheng Chen

Institute of Engineering Thermophysics,
Chinese Academy of Sciences,
11 Beisihuanxi Road,
Beijing 100190, China;
School of Engineering Sciences,
University of Chinese Academy of Sciences,
No. 19(A) Yuquan Road, Shijingshan District,
Beijing 100049, China
e-mail: chen_hs@mail.etp.ac.cn

1Corresponding author.

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received August 1, 2017; final manuscript received February 24, 2018; published online June 25, 2018. Assoc. Editor: Alexandrina Untaroiu.

J. Eng. Gas Turbines Power 140(10), 102502 (Jun 25, 2018) (8 pages) Paper No: GTP-17-1421; doi: 10.1115/1.4039804 History: Received August 01, 2017; Revised February 24, 2018

It is a common practice to use closed impeller in radial inflow turbine against the flow leakage from tip clearance of impellers, especially in small volume flow condition. It utilizes labyrinths between the shroud and the case to abate the higher pressure leakage. Experimental and computational investigations of shroud clearance flow in a radial inflow turbine with labyrinth seals are presented in this paper. Compared with the result without leakage, numerical computation result including the leakage of labyrinth seals agrees better with that of the experiment result, which indicates that the leakage of labyrinth seals cannot be neglected. Several geometrical arrangements with a series of different clearance of labyrinth seals are investigated experimentally and numerically, and the dimensionless shroud clearance is of 0%, 0.6%, 1.2%, 1.8%, 2.7%, 3.6%. Finally, the character of flow and loss is analyzed by computational fluid dynamics (CFD) tools. The results indicate that the labyrinth seal flow has no effect on the main flow passage and mainly causes different leakage mass flow.

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Figures

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Fig. 6

Numerical model and mesh of the radial inflow turbine

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Fig. 7

Grid independence for the radial inflow turbine

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Fig. 8

Comparison of measured and CFD stage efficiency of the turbine

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Fig. 9

Labyrinth seals structure of the closed radial inflow turbine

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Fig. 5

The measurement positions of temperature and pressure sensors

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Fig. 4

The structure of the closed radial inflow turbine and labyrinth seals

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Fig. 3

Experimental principle and the radial inflow turbine test facility

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Fig. 2

The structure of the closed radial inflow turbine

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Fig. 1

Flow path structure of centrifugal compressor with closed impeller

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Fig. 10

Variation of isentropic efficiency with dimensionless shroud clearance

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Fig. 11

The leakage mass flow and stage efficient with different shroud clearance

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Fig. 12

Axial distribution of static pressure around the turbine shroud

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Fig. 13

The pressure contours in the labyrinth with different clearance: (a) c¯ = 0.6%, (b) c¯ = 1.2%, (c) c¯ = 1.8%, and (d) c¯ = 2.7%

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Fig. 14

Streamlines and Mach in the labyrinth with different clearance: (a) c¯ = 0.6%, (b) c¯ = 1.2%, (c) c¯ = 1.8%, and (d) c¯ = 2.7%

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Fig. 15

Limiting streamlines on pressure and suction surfaces: (a) the model with labyrinth seals and (b) the model without labyrinth seals

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