论文部分内容阅读
以美国Sandia实验室火焰D为研究对象,在采用κ-ε湍流模型、概率密度函数(PDF)法及详细化学反应机理模拟湍流燃烧的基础上,研究了辐射换热对湍流射流燃烧过程的影响。模拟中采用离散坐标法(DOM)求解辐射传递方程,并分别采用普朗克平均吸收系数和箱带模型计算燃烧气体的辐射特性参数。结果表明,考虑辐射换热的影响时,火焰温度及组分浓度分布计算值与实验值吻合更好,且采用考虑气体光谱辐射效应的箱带模型比仅随温度变化的普朗克平均吸收系数的计算值更接近实验值。因此,研究燃烧气体的辐射换热问题具有重要意义,同时需要考虑其光谱辐射效应。
Based on Flame D of Sandia laboratory in the United States, the effects of radiative heat transfer on the turbulent jet combustion process were studied based on the κ-ε turbulence model, the probability density function (PDF) method and the detailed chemical reaction mechanism. . In the simulation, the Radiation Transfer Equation was solved by Discrete Ordinate Method (DOM), and the radiation parameters of combustion gas were calculated by Planck average absorption coefficient and box model. The results show that, considering the influence of radiation heat transfer, the calculated values of the flame temperature and the component concentration distribution are in good agreement with the experimental values. Compared with the Planck average absorption coefficient The calculated value is closer to the experimental value. Therefore, it is of great significance to study the radiation heat transfer of combustion gases, at the same time it needs to consider its spectral radiation effect.