Exploring the Benefits of Annular Rectangular Rib for Enhancing Thermal Efficiency of Nonpremixed Micro-Combustor. (13th February 2020)

• Record Type: Journal Article
• Authors: Wang, Hongcai; Fang, Hongru; Lou, Bingqian; Abubakar, Shitu; Li, Yuqiang; Meng, Lei
• Other Names: Tu Yaojie Guest Editor.
• Is Part Of: Journal of chemistry. Volume 2020(2020)
• Publication Date: 2020-02-13
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1155/2020/9410389
• Languages: English
• ISSNs: 2090-9063

Abstract

Abstract : 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.