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Research Papers: Fuel Combustion

Numerical Study on Heat Transfer Enhanced in a Microcombustor With Staggered Cylindrical Array for Micro-Thermophotovoltaic System

[+] Author and Article Information
Haojie Li, Cheng Hu, Shuai Feng

Key Laboratory of Low-Grade Energy Utilization
Technologies and Systems,
Chongqing University,
Chongqing 400030, China

Yanrong Chen

Key Laboratory of Low-Grade Energy Utilization
Technologies and Systems,
Chongqing University,
Chongqing 400030, China
e-mail: rong_box@sina.com

Yunfei Yan

Key Laboratory of Low-Grade Energy Utilization
Technologies and Systems,
Chongqing University,
Chongqing 400030, China
e-mail: yunfeiyan@cqu.edu.cn

Hu Fan

Youshui Hydropower Exploiture of
Chongqing Co., Ltd.,
Chongqing 409809, China

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received October 5, 2017; final manuscript received April 20, 2018; published online July 23, 2018. Assoc. Editor: Reza Sheikhi.

J. Energy Resour. Technol 140(11), 112204 (Jul 23, 2018) (6 pages) Paper No: JERT-17-1536; doi: 10.1115/1.4040191 History: Received October 05, 2017; Revised April 20, 2018

In consideration of high heat transfer efficiency and stable combustion, a new type of microplanar combustor for micro-thermophotovoltaic (micro-TPV) system is proposed, in which the heat transfer is enhanced by staggered cylindrical array. The numerical study results indicate that the temperature of radiation wall of cylindrical-array combustor is higher and more uniform comparing with the conventional-channel combustor, the application of cylindrical-array make the effective radiation of the combustor increase 34.55% and reach to 35.98 W. Moreover, with inlet velocity increase from 4 m/s to 16 m/s, the cylindrical-array combustor shows the better stability of combustion, which the position of the flame moves 4.8 mm in the cylindrical-array combustor and 9.1 mm in the conventional-channel combustor. However, the 0.5–4.5 equivalence ratio range for stable combustion is slightly narrower than 0.4–6.0 in the conventional-channel combustor. To extend the equivalence ratio range, one row of cylindrical array was canceled, and the distribution length of cylindrical array was reduced to 10 mm, After this improvement, the equivalence ratio range is extended to 0.3–5.5, and the negative effect on the flame stability of the cylindrical array is basically eliminated.

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References

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Figures

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Fig. 1

Schematic of the micro combustors: (a) cylindrical-array combustor and (b) conventional-channel combustor

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Fig. 2

Mesh independence comparison (the error is less than 1%)

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Fig. 3

Validation of computational model

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Fig. 4

The temperature distributions of center section on the combustor (inlet velocity = 4 m/s, equivalence ratio Φ = 1, inlet temperature = 300 K): (a) conventional-channel combustor and (b) cylindrical-array combustor

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Fig. 5

The mean temperature of radiation wall at different inlet velocity (Φ = 1, inlet temperature = 300 K)

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Fig. 6

The temperature distribution on the radiation wall. Inlet velocity: (a) 4 m/s, (b) 6 m/s, (c) 8 m/s, and (d) 10 m/s (Φ = 1, inlet temperature = 300 K).

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Fig. 7

The flame position varied with inlet velocity (Φ = 1, inlet temperature = 300 K)

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Fig. 8

Velocity vectors in the cylindrical-array combustor (inlet velocity = 4 m/s)

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Fig. 9

The equivalence ratio range of the two combustor (inlet velocity = 4 m/s, inlet temperature = 300 K); the symbol “×” means flameout

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Fig. 10

The equivalence ratio range of the three combustor (inlet velocity = 4 m/s, inlet temperature = 300 K). The symbol “×” means flameout.

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Fig. 11

The centerline temperature distribution on the radiation wall (inlet velocity = 4 m/s, inlet temperature = 300 K)

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