Exploring the Benefits of Annular Rectangular Rib for Enhancing Thermal Efficiency of Nonpremixed Micro-Combustor
| Autor: | Hong-ru Fang, Shitu Abubakar, Yuqiang Li, Lei Meng, Hong-cai Wang, Bingqian Lou |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Rib cage
Thermal efficiency Article Subject Turbulence business.industry Chemistry 020209 energy Mass flow 02 engineering and technology General Chemistry Mechanics 021001 nanoscience & nanotechnology Heat transfer 0202 electrical engineering electronic engineering information engineering Combustor Combustion chamber 0210 nano-technology business QD1-999 Thermal energy |
| Zdroj: | Journal of Chemistry, Vol 2020 (2020) |
| ISSN: | 2090-9071 2090-9063 |
| Popis: | Micro-combustor can provide the required thermal energy of micro-thermal photovoltaic (MTPV) systems. The performance of MTPV is greatly affected by the effectiveness of a micro-combustor. In this study, a numerical simulation was conducted to explore the benefits of annular rectangular rib for enhancing the thermal performance of a nonpremixed micro-combustor. Based on the investigations under various rib heights, rib positions, and inlet mass flow rates, it is found that the addition of annular rectangular ribs in the micro-combustor creates a turbulent zone in the combustion chamber, thereby enhancing the heat transfer efficiency between the inner wall of the combustion chamber and the burned gas. The micro-combustor with annular rectangular rib shows a higher and more uniform wall temperature. When the H2 mass flow is 7.438 × 10−8 kg/s and the air mass flow is 2.576 × 10−6 kg/s, the optimum dimensionless rib position is at l = 6/9 and r = 0.4. At this condition, the micro-combustor has the most effective and uniform heat transfer performance and shows significant decreases in entropy generation and exergy destruction. However, the optimum l and r significantly depend on the inlet mass flow of H2/air mixture. |
| Databáze: | OpenAIRE |
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