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research-article

Numerical study on heat transfer enhanced in a micro combustor with staggered cylindrical array for micro-TPV system

[+] Author and Article Information
Haojie Li

Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University), Chongqing 400030, China
981772426@qq.com

Yangrong Chen

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

YunFei Yan

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

Cheng Hu

Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Chongqing 400030, China
1030229883@qq.com

Hu Fan

Youshui Hydropower Exploiture of Chongqing Co. Ltd., Chongqing 409809
2436340365@qq.com

Shuai Feng

Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Chongqing 400030, China
shuaifengkelvin@yeah.net

1Corresponding author.

ASME doi:10.1115/1.4040191 History: Received October 05, 2017; Revised April 20, 2018

Abstract

In consideration of high heat transfer efficiency and stable combustion, a new type of micro planar combustor for micro-TPV (micro-thermophotovoltaic) 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 35.98w. Moreover, with inlet velocity increase from 4m/s to 16m/s, the cylindrical-array combustor shows the better stability of combustion, which the position of the flame moves 4.8mm in the cylindrical-array combustor and 9.1mm 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 cancelled and the distribution length of cylindrical array was reduced to 10mm, After this improvement, the equivalence ratio range is extended to 0.3-5.5, the negative effect on the flame stability of the cylindrical array is basically eliminated.

Copyright (c) 2018 by ASME
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