新型多孔介质辐射燃烧器设计与燃烧特性模拟

Design and Combustion Characteristics Simulation of a Novel Porous Media Radiant Burner

摘要

针对提升辐射加热效率的需求,设计开发了一种板式多孔介质辐射燃烧器.该装置由采用 Kelvin 胞元阵列的多孔辐射板、带有均匀圆柱直通道的配风板以及圆形转方形的渐扩型燃烧室壳体构成.基于三维孔隙尺度数值模拟方法,研究了多孔辐射板结构、配风板直孔布置及燃烧室过渡角度对甲烷-空气预混燃烧特性的影响.结果表明:当多孔辐射板孔密度为 10 PPI(pores per inch)时,配风板采用 10×10 阵列直通道,燃烧器性能最优；在热输入功率为 300 kW/m² 的工况下,采用双层多孔辐射板可有效提高燃烧器辐射效率并延长辐射板使用寿命；燃烧器壳体过渡角为 53°时,能够改善固体骨架内温度均匀性,同时保持较高的燃烧器辐射效率.

Abstract

To meet the requirement of enhanced radiative heating efficiency, a planar porous media radiant burner was designed and developed. The device comprises three main components: a porous radiant plate constructed with Kelvin cell arrays, an air-distribution plate featuring uniformly arranged cylindrical straight channels, and a burner housing with a gradually expanding circular-to-square transition. A three-dimensional pore-scale numerical simulation method was employed to investigate the effects of the porous radiant plate structure, the straight-channel arrangement of the air-distribution plate, and the transition angle of the burner housing on the characteristics of methane-air premixed combustion. The results indicate that the burner achieves optimal performance when the porous radiant plate has a pore density of 10 PPI(pores per inch) and the air-distribution plate is configured with a 10×10 array of straight channels. Under an operating condition with a thermal input power of 300 kW/m², employing a double-layered porous radiant plate effectively improves radiative heating efficiency and extends the service life of the porous radiant plate. Furthermore, a transition angle of 53° for the burner housing improves temperature uniformity within the solid skeleton of the porous radiant plate while maintaining high radiative heating efficiency.

关键词

多孔介质燃烧 / 多孔介质燃烧器 / 多孔辐射板 / 三维孔隙尺度数值模拟

Key words

porous media combustion / porous media burner / porous radiant plate / three-dimensional pore-scale numerical simulation

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基金资助

国家自然科学基金-湖北联合基金资助项目(U22A20127)