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通过雷诺平均纳维叶斯托克斯模型(Reynolds averaged Navier-Stokes,RANS)数值模拟研究了反应物,在不同进口管径下,燃烧室内热量输出和烟气循环率对预混燃烧模式的影响。计算结果表明,燃烧室内的燃烧模式是由通过墙壁导出的热流率和内部烟气循环率共同决定的。通过分析发现,要在燃烧室内实现无焰燃烧,不仅需要高强度的烟气循环以稀释炉内的反应物浓度,进而减缓燃料的氧化反应,还应该加大燃烧室的换热速率以控制炉内的局部温度大小和炉内温度的均匀度。
Reynolds averaged Navier-Stokes (RANS) numerical simulation was used to study the effects of reactants, combustion heat output and flue gas circulation rate on premixed combustion modes at different inlet pipe diameters . The calculation results show that the combustion mode in the combustion chamber is determined by the heat flow rate derived from the wall and the internal flue gas circulation rate. Through the analysis found that to achieve flameless combustion in the combustion chamber, not only need high-intensity flue gas circulation to dilute the concentration of reactants in the furnace, thereby reducing the fuel oxidation reaction, but also should increase the heat transfer rate of the combustion chamber to control the furnace Within the local temperature and furnace temperature uniformity.