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Research Papers

Design and Numerical Analysis of a Vane Shaped Receiver Hole in a Cover-Plate Preswirl System

[+] Author and Article Information
Yuxin Liu

School of Power and Energy,
Northwestern Polytechnical University,
127 West Youyi Road,
Xi'an 710072, China
e-mail: liuyuxin_lz@163.com

Gaowen Liu

School of Power and Energy,
Northwestern Polytechnical University,
127 West Youyi Road,
Xi'an 710072, China
e-mail: gwliu@nwpu.edu.cn

Xiaozhi Kong

School of Power and Energy,
Northwestern Polytechnical University,
127 West Youyi Road,
Xi'an 710072, China
e-mail: kongxiaozhi_lx@163.com

Yangang Wang

School of Power and Energy,
Northwestern Polytechnical University,
127 West Youyi Road,
Xi'an 710072, China
e-mail: wyg704@nwpu.edu.cn

Manuscript received February 27, 2018; final manuscript received September 27, 2018; published online November 1, 2018. Assoc. Editor: Philip Bonello.

J. Eng. Gas Turbines Power 141(4), 041001 (Nov 01, 2018) (10 pages) Paper No: GTP-18-1099; doi: 10.1115/1.4041628 History: Received February 27, 2018; Revised September 27, 2018

In a cover-plate system, rotating receiver hole is an important component, because its structure and characteristics directly influence the aerodynamic loss and cooling performance in the preswirl system. A new type of vane shaped (VS) receiver hole was designed and presented in this paper. Numerical simulations were carried out to compare the performances among high-radius direct transfer system (model-A), low-radius cover-plate system with simple drilled (SD) receiver holes (model-B), and low-radius cover-plate system with VS receiver holes (model-C). Results indicate that for the operating conditions simulated here, temperature drop effectiveness of the high-radius preswirl system is much better compared to the low-radius system with SD receiver hole. With VS receiver hole, the aerodynamic loss in model-C is the lowest. The nondimensional static pressure at preswirl nozzle exit is only 0.93, around 10% lower than model-B. Moreover, it has a more remarkable cooling performance. The temperature drop effectiveness of model-C can be as high as 0.52, around 67.7% higher compared to model-A. The system with VS receiver hole could not only realize the advantage of low leakage flow as a low-radius system, but also could achieve higher temperature drop compared to high-radius system.

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References

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Figures

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Fig. 1

Geometric model of VS receiver hole: (a) geometric model and (b) geometric parameters

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Fig. 2

Inlet and outlet velocity triangle of VS receiver hole

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Fig. 3

Calculational models and mesh generation: (a) model-A, (b) model-B, and (c) model-C

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Fig. 4

Test rig of the preswirl system [20]

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Fig. 5

The comparisons between computational results and test data: (a) CD of preswirl nozzle and (b) temperature drop

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Fig. 6

Nondimensional static pressure at typical stations

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Fig. 7

Nondimensional static pressure contours and streamlines in the cover-plate cavity: (a) model-B and (b) model-C

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Fig. 8

Swirl ratio distribution at typical stations for different models

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Fig. 9

Swirl ratio contours and streamlines in the receiver hole: (a) SD receiver hole and (b) VS receiver hole

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Fig. 10

Swirl ratio contours and streamlines in the supply hole: (a) model-A, (b) model-B, and (c) model-C

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Fig. 11

Discharge coefficient for main components

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Fig. 12

The entropy increase at typical axial stations

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Fig. 13

Nondimensional relative total temperature at typical stations

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Fig. 14

Temperature drop effectiveness

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