燃烧过程辐射换热离散坐标模型的应用

对离散坐标(DO)辐射传热模型分别在长方体空间和旋流燃烧室内进行了验证与应用。长方体空间的计算结果表明:DO模型的纯辐射传热预报结果比六热流(SHF)模型准确,与计算精确的区域法的计算结果吻合较好,而SHF模型的预报结果却有较大的误差。对于旋流燃烧室内温度场的模拟预报也表明,DO模型的计算结果和实验值相吻合,明显高于用SHF模型计算所得的温度值。另外,DO模型在计算时间和边界处理等方面比区域法优越;在收敛速度和计算准确度等方面也比工程常用的六通量模型优越。 

Application of Discrete-Ordinates Model to the Study of Radiative Heat Transfer

The radiative heat transfer model,i.e.Discrete-Ordinates(DO) model,was verified by and applied to a combustion chamber and a three dimensional(3D) swirl combustor.For the combustion chamber,the predicted results of pure radiative heat transfer were in good agreement with those of the zone method,while the SHF model gave relatively large deviations.For swirl combustor,the predicted temperature distribution of DO model were in good agreement with those measured by experiment and were better than those of the SHF model.Also,the computation time and boundary treatment,the DO model was better than zone model and six heat flux model.