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Research Papers: Fuel Combustion

Effect of Cavity Coupling Factors of Opposed Counter-Flow Microcombustor on the Methane-Fueled Catalytic Combustion Characteristics

[+] Author and Article Information
Yunfei Yan

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

Ying Liu

Key Laboratory of Low-grade Energy Utilization
Technologies and Systems,
Chongqing University,
Chongqing 400030, China
e-mail: 1821523102@qq.com

Haojie Li

Key Laboratory of Low-grade Energy Utilization
Technologies and Systems,
Chongqing University,
Chongqing 400030, China
e-mail: hjl1221@cqu.edu.cn

Weipeng Huang

Key Laboratory of Low-grade Energy Utilization
Technologies and Systems,
Chongqing University,
Chongqing 400030, China
e-mail: 675554663@qq.com

Yanrong Chen

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

Lixian Li

Chongqing Cancer Institute and Hospital and
Cancer Center,
Chongqing 400030, China
e-mail: lilixian2010@yahoo.com

Zhongqing Yang

Key Laboratory of Low-grade Energy Utilization
Technologies and Systems,
Chongqing University,
Chongqing 400044, China
e-mail: zqyang@cqu.edu.cn

1Corresponding authors.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received March 13, 2018; final manuscript received August 31, 2018; published online September 26, 2018. Assoc. Editor: Reza Sheikhi.

J. Energy Resour. Technol 141(2), 022202 (Sep 26, 2018) (9 pages) Paper No: JERT-18-1199; doi: 10.1115/1.4041405 History: Received March 13, 2018; Revised August 31, 2018

In this work, numerical investigations of methane catalytic combustion in the opposed counter-flow microcombustor are conducted under various inlet velocities, equivalence ratios, and geometric parameters. The results indicate that the high temperature zone is mainly located at the front and middle parts of the reaction zone. With the increase of inlet velocity, both methane conversion and exhaust gas temperature decrease, while the methane concentration in the downstream area increases. Its maximum velocity limit is 2.9 m/s. Moreover, temperature step zones of opposed counter-flow are obviously located at the front and middle parts with different equivalence ratios. The combustion efficiency decreases slowly with the increase of equivalence ratios. More importantly, critical values about the geometric parameters are determined for keeping better thermal performance. It is concluded that inlet velocity limit and methane conversion rate can be significantly increased and the temperature distribution is more uniform via reducing inlet width L2 and inlet height H, increasing the length of the downstream parts L1 and the downstream entrance length L3. In general, the opposed counter-flow microcombustor with optimized structure has better combustion stability. This design offers another way for developing the opposed counter-flow microcombustor.

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Figures

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Fig. 1

Physical model of opposed counter-flow microcombustor

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Fig. 2

Study of Mesh independency

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Fig. 3

Comparison of numerical results with experiment data

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Fig. 4

Effect of inlet velocity on methane conversion rate and exhaust gas temperature

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Fig. 5

Methane concentration with different inlet velocity (a) 0.3 m/s, (b) 0.7 m/s, and (c) 1.1 m/s

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Fig. 6

Temperature distribution with different inlet velocity (a) 0.3 m/s, (b) 0.7 m/s, and (c) 1.1 m/s

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Fig. 7

Effect of equivalence ratio on exhaust gas temperature

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Fig. 8

Distribution of center axis temperature

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Fig. 9

Effect of equivalence ratio on combustion efficiency

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Fig. 17

Influence of different L1 lengths on air inflow

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Fig. 16

Influence of different L1 lengths on velocity field

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Fig. 15

(a) Distribution of methane mass fraction under different L1 length and (b) temperature distribution under different L1 length

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Fig. 14

Influence of inlet velocity on methane conversion rate

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Fig. 13

The influence of different L2 width on the air inflow

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Fig. 12

The influence of L2 on the X-velocity field

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Fig. 11

(a) Methane mass fraction distribution under different L2 widths and (b) temperature distribution under different L2 widths

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Fig. 10

The influence of inlet velocity on methane conversion

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Fig. 18

Influence of inlet velocity on methane conversion rate

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Fig. 19

(a) Distribution of methane mass fraction of different L3 lengths and (b) temperature distribution of different L3 lengths

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Fig. 20

Influence of different L3 lengths on air inflow

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Fig. 21

Influence of different L3 lengths on velocity field

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Fig. 22

Influence of inlet velocity on methane conversion rate

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Fig. 23

(a) Distribution of methane mass fraction at different H height and (b) temperature distribution of different H height

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Fig. 24

Influence of different H height on air inflow

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Fig. 25

Influence of different H on velocity field

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