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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Numerical Investigation on Aerodynamic and Combustion Performance of Chevron Mixer Inside an Afterburner

[+] Author and Article Information
Shan Yong

Jiangsu Province Key Laboratory
of Aerospace Power System,
College of Energy and Power Engineering,
Nanjing University of Aeronautics and Astronautics,
29 Yudao Street,
Nanjing 210016, China
e-mail: nuaasy@nuaa.edu.cn

Zhang JingZhou

Jiangsu Province Key Laboratory
of Aerospace Power System,
College of Energy and Power Engineering,
Nanjing University of Aeronautics and Astronautics,
29 Yudao Street,
Nanjing 210016, China
e-mail: zhangjz@nuaa.edu.cn

Wang Yameng

Jiangsu Province Key Laboratory
of Aerospace Power System,
College of Energy and Power Engineering,
Nanjing University of Aeronautics and Astronautics,
29 Yudao Street,
Nanjing 210016, China
e-mail: 13915973855@139.com

1Corresponding author.

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received December 31, 2013; final manuscript received April 3, 2014; published online May 16, 2014. Assoc. Editor: Klaus Dobbeling.

J. Eng. Gas Turbines Power 136(11), 111501 (May 16, 2014) (8 pages) Paper No: GTP-13-1466; doi: 10.1115/1.4027604 History: Received December 31, 2013; Revised April 03, 2014

To improve the performance of the afterburner for the turbofan engine, an innovative type of mixer, namely, the chevron mixer, was considered to enhance the mixture between the core flow and the bypass flow. Computational fluid dynamics (CFD) simulations investigated the aerodynamic performances and combustion characteristics of the chevron mixer inside a typical afterburner. Three types of mixer, namely, CC (chevrons tilted into core flow), CB (chevrons tilted into bypass flow), and CA (chevrons tilted into core flow and bypass flow alternately), respectively, were studied on the aerodynamic performances of mixing process. The chevrons arrangement has significant effect on the mixing characteristics and the CA mode seems to be advantageous for the generation of the stronger streamwise vortices with lower aerodynamic loss. Further investigations on combustion characteristics for CA mode were performed. Calculation results reveal that the local temperature distribution at the leading edge section of flame holder is improved under the action of streamwise vortices shedding from chevron mixers. Consequently, the combustion efficiency increased by 3.5% compared with confluent mixer under the same fuel supply scheme.

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Figures

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Fig. 1

Tabs on the nozzle outlet (Ref. [16])

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Fig. 2

Chevron nozzles (Ref. [17])

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Fig. 3

Schematic of simplified afterburner model: (a) afterburner, (b) computational domain, and (c) flameholder

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Fig. 4

Schematic of chevrons: (a) CC, (b) CB, (c) CA, and (d) chevrons of CA

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Fig. 5

Streamwise vorticity at mixer exit (unit: s−1): (a) CC, (b) CB, and (c) CA

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Fig. 6

Local temperature distributions in symmetry plane (unit: K): (a) CM, (b) CC, (c) CB, and (d) CA

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Fig. 7

Temperature distributions at leading edge section of flame holder (unit: K): (a) CM, (b) CC, (c) CB, and (d) CA

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Fig. 8

Thermal mixing efficiencies for various mixers

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Fig. 9

Effects of chevron titled angle on thermal mixing efficiency in CC case

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Fig. 10

Total pressure recovery coefficients for various mixers

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Fig. 11

Fuel droplet diameter distributions at symmetry plane (unit: mm): (a) CM and (b) CA

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Fig. 12

Temperature distributions of reacting filed at symmetry plane (unit: K): (a) confluent mixer and (b) chevron mixer

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Fig. 13

Fuel mass fraction distributions (the planes defined in Fig. 3(b)): (a) confluent mixer and (b) chevron mixer

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Fig. 14

Sectional area-average fuel mass fraction in CA case (the section defined in Fig. 3(b))

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