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Research Papers: Gas Turbines: Turbomachinery

Investigation on the Impact of Protrusion Parameter on the Efficiency of Converting Additional Windage Loss for Ingress Alleviation in Rotor–Stator System

[+] Author and Article Information
Dongdong Liu

National Key Laboratory of Science and
Technology on Aero-Engine
Aero-Thermodynamics,
Beihang University,
37# Xueyuan Road, Haidian District,
Beijing 100191, China
e-mail: liudongdongbuaa@buaa.edu.cn

Zhi Tao

National Key Laboratory of Science and
Technology on Aero-Engine
Aero-Thermodynamics,
Beihang University,
37# Xueyuan Road, Haidian District,
Beijing 100191, China
e-mail: tao_zhi@buaa.edu.cn

Xiang Luo

National Key Laboratory of Science and
Technology on Aero-Engine
Aero-Thermodynamics,
School of Energy and Power Engineering,
Beihang University,
37# Xueyuan Road, Haidian District,
Beijing 100191, China
e-mail: xiang.luo@buaa.edu.cn

Wenwu Kang

National Key Laboratory of Science and
Technology on Aero-Engine
Aero-Thermodynamics,
Beihang University,
37# Xueyuan Road, Haidian District,
Beijing 100191, China
e-mail: wenwukang@buaa.edu.cn

Hongwei Wu

Department of Mechanical and
Construction Engineering,
Faculty of Engineering and Environment,
Northumbria University,
Newcastle upon Tyne NE1 8ST, UK
e-mail: hongwei.wu@northumbria.ac.uk

Xiao Yu

Shenyang Aeroengine Research Institute,
Aviation Industry Corporation of China,
Shenyang 110015, China
e-mail: yx-mail@sohu.com

1Corresponding authors.

Contributed by the Turbomachinery Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received March 3, 2016; final manuscript received April 26, 2016; published online June 28, 2016. Editor: David Wisler.

J. Eng. Gas Turbines Power 138(11), 112604 (Jun 28, 2016) (9 pages) Paper No: GTP-16-1098; doi: 10.1115/1.4033617 History: Received March 03, 2016; Revised April 26, 2016

This paper presents a detailed investigation on the impact of protrusion parameter including both radial position and amount on the efficiency of cavity with protrusion converting additional windage loss for ingress alleviation in rotor–stator system. Experiment is conducted to explore the effect of protrusion parameter on ingress, and the corresponding additional windage loss is also calculated. During the experiment, rotor-mounted protrusions are circumferentially assembled at three different radial positions (0.9b, 0.8b, and 0.7b) each with four different amounts (32, 24, 16, and 8). Measurements of CO2 concentration and pressure inside turbine cavity are conducted. In the experiment, the annulus Reynolds number and rotating Reynolds number are set at 1.77 × 105 and 7.42 × 105, respectively, while the dimensionless sealing air flow rate ranges from 3047 to 8310. Experimental result shows that the cases of protrusion set at 0.8b achieve higher sealing efficiency than other cases as the cavity pressure is enhanced. The effect of protrusion amount on ingress could be obviously seen when CW is small or protrusion set in 0.7b. Furthermore, a parameter to evaluate which case obtains higher efficiency of converting additional windage loss for ingress alleviation, or alleviates ingress more efficiently for short, is applied for discussion. It is found that the case “C, N = 8” alleviates ingress most efficiently among all the cases. Therefore, proper setting of the protrusion could lead to high efficiency of converting additional windage loss for ingress alleviation in rotor–stator system.

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References

Figures

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Fig. 1

The overall layout of the experimental facility

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Fig. 2

Cross section of the overall configuration

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Fig. 3

Structure of four models tested in experiment

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Fig. 4

The radial εc for the cases of same model at CW = 3047: (a) model B, (b) model C, and (c) model D

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Fig. 5

The variation of εc with CW for the cases of the same model: (a) model B, (b) model C, and (c) model D

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Fig. 6

The comparison of εc for the cases with the same protrusion number at CW = 3047: (a) amount of 32, (b) amount of 24, and (c) amount of 16

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Fig. 7

The variation of εc with CW for the cases with same protrusion number: (a) amount of 32, (b) amount of 24, (c) amount of 16, and (d) amount of 8

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Fig. 8

CW when sealing efficiency gets 0.9 for all the cases

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Fig. 9

The section flow of hot gas ingestion with rotor-mounted protrusion

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Fig. 10

The pressure on static wall for four cases when CW = 3047

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Fig. 11

The variation of εc with CW for three cases

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Fig. 12

The δ for all the cases

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