期刊
APPLIED THERMAL ENGINEERING
卷 113, 期 -, 页码 1011-1020出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2016.11.074
关键词
Micro combustion; Outer wall temperature; Thermal performance; Gradually reduced wall thickness; Inlet/outlet diameter ratio
资金
- National Natural Science Foundation of China [51676066]
Micro combustor is the key component of the micro-thermophotovoltaic (MTPV) system. A high and uniform wall temperature distribution on the micro combustor is helpful for obtaining higher energy conversion efficiency. In this work, a micro-cylindrical combustor with gradually reduced wall thickness is developed. The micro-cylindrical combustors with gradually reduced wall thickness are widely investigated and compared with the micro-cylindrical combustors with a step under various conditions. Results suggest that the micro-cylindrical combustors with gradually reduced wall thickness has a higher and more uniform wall temperature distribution under various H-2/air equivalence ratios, H-2 mass flow rates and inlet/outlet diameter ratios compared with that of the micro-cylindrical combustors with a step. However, it should be noted that effects of solid material on the outer wall temperature of the two micro-cylindrical combustors are interesting. The thermal performance of micro-cylindrical combustor with gradually reduced wall thickness is better under the solid material of quartz whose thermal conductivity is low, while the positive effects brought by the micro-cylindrical combustor with gradually reduced wall thickness disappear under the solid material of silicon carbide whose thermal conductivity is high. (C) 2016 Elsevier Ltd. All rights reserved.
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