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在非结构混合网格有限体积框架下,将RANS方程和层流火焰面模型相结合,开展超声速湍流燃烧流动数值模拟研究,时间和空间离散分别采用LU-SGS格式和HLLC格式。用SST k-ω模型模拟湍流,FlameMaster 3.9生成火焰面数据库,并采用β-PDF和δ-PDF分布来考察湍流和化学反应的相互作用。采用该数值方法,对DLR氢燃料超燃燃烧室和北航乙烯燃料气动斜坡超燃燃烧室开展了数值模拟研究,并将数值计算结果与实验数据进行对比,二者符合较好。研究结果表明:在主流中心支板顺流喷射超燃燃烧室内,燃烧主要发生在支板后的燃料/空气混合层内,并且火焰核心落在恰当混合物分数Z st附近区域。
Under the finite volume framework of unstructured mixed meshes, the RANS equation is combined with the laminar flame model to study the numerical simulation of supersonic turbulent combustion flow. The time and space discretization are respectively LU-SGS and HLLC. Turbulence was simulated using the SST k-ω model, FlameMaster 3.9 generated a flame surface database and examined the interaction between turbulence and chemical reactions using β-PDF and δ-PDF distributions. Using this numerical method, the numerical simulation of DLR hydrogen fuel combustion combustor and the Beihang ethylene fuel aerodynamic slope combustion chamber are carried out. The numerical results are in good agreement with the experimental data. The results show that combustion occurs mainly in the fuel / air mixing layer behind the support plate in the forward jet superalloys of the mainstream center plate, and the flame core falls in the vicinity of the proper mixture fraction Z st.