期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 45, 期 7, 页码 5014-5027出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2019.12.093
关键词
Micro combustor; Heat transfer enhancement; Pin fin arrays; Equivalence ratio; Materials
资金
- National Natural Science Foundation of China [U1737113]
- China Aerospace Science and Technology Corporation on Advanced Manufacturing Technology for Aerospace Industry [U1737113]
- Fundamental Research Funds for the Central Universities [2019CDYGYB022]
- Graduate Scientific Research and Innovation Foundation of Chongqing [CYB19061]
- Natural Science Foundation of Chongqing [cstc2019jcyj-msxmX0223]
Targeted at improving the combustion stability and enhancing heat transfer in micro combustor, the combustion characteristics and thermal performance of micro combustor with pin fin arrays are numerically investigated by employing detail H-2/O-2 reaction mechanism. It is shown that the micro combustor with staggered pin fin arrays exhibits the highest average temperature and heat flux of external wall, while the micro combustor with in-line pin fin arrays displays the most uniform temperature distribution of external wall. When the equivalence ratio is 1.1, all micro combustors exhibit the highest mean temperature and heat flux of external wall. The micro combustor materials with high thermal conductivity can not only improve the average temperature and heat flux of external wall, but also enhance heat transfer to the upstream which can preheat the mixed gas. Therefore, the materials with high thermal conductivity, such as red copper and aluminum, can make up for the nonuniform temperature distribution of micro combustor with staggered pin fin arrays, so as to realize uniform high heat flux output of external wall. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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