节点文献
带挡板的预混氢/空气燃料微型燃烧室的热性能优化(英文)
Optimizing thermal performance of a premixed hydrogen/air fueled micro-combustor with baffles
【摘要】 微燃烧室是微热光伏系统(MTPV)的重要组成部件。本研究中提出了一种能提高热性能的新型平板式带挡板的氢气/空气预混微型燃烧室,该燃烧室提升了平均壁温和理论辐射效率等性能,考虑了壁温均匀性,并优化了内置挡板的材料、数量、长度、厚度和布局等关键参数。研究结果表明,引入不锈钢材料的水平挡板将导致平均壁温明显升高约150 K,同时还能改善壁温分布使其更均匀。在考虑燃烧室和挡板的材料时,本文评估了不锈钢、氧化铝陶瓷、碳化硅和石英四种材料,其中不锈钢表现出最高的平均壁温和理论辐射效率,而碳化硅表现出最均匀的壁温。当微型燃烧室配备的挡板参数为:数量N=3,长度L=13.5 mm,厚度t=0.3 mm时,实现了最佳的热性能。值得注意的是,当微燃烧室内的挡板为以上结构参数时适合集群布局,这可以实现平均壁温、理论辐射效率和均匀性的更大改进。
【Abstract】 The micro-combustor serves as a critical component in the micro-thermal photovoltaic system(MTPV). In this study, a novel premixed hydrogen/air fueled micro-combustor with baffles was proposed to enhance thermal performance, including average wall temperature, theorical radiation efficiency, and wall temperature uniformity. The key parameters of baffles, including materials, quantity, length, thickness, and layout were optimized. The findings reveal that the introduction of baffles with stainless steel materials led to a noticeable rise in average wall temperature by approximately 150 K, along with a more uniform wall temperature distribution. When considering the materials for the combustion chamber and baffles, stainless steel, alumina ceramics, silicon carbide, and quartz were evaluated. Among these options, stainless steel exhibits the highest average wall temperature and theorical radiation efficiency, while silicon carbide displays the most uniform wall temperature. Upon being outfitted with three stainless steel baffles, each with a length of 13.5 mm and a thickness of 0.3 mm, the micro-combustor achieved optimal thermal performance. It is worth noting that even greater improvements in average wall temperature, theoretical radiation efficiency, and uniformity can be achieved by implementing a well-suited clustered layout for these three baffles.
【Key words】 micro-thermal photovoltaic system; micro-combustor; thermal performance; baffle optimization;
- 【文献出处】 Journal of Central South University ,中南大学学报(英文版) , 编辑部邮箱 ,2023年12期
- 【分类号】TQ038