圆筒炉内燃烧器出口湍流流动和燃油燃烧的三维数值模拟

THREE-DIMENSIONAL NUMERICAL SIMULATION OF TURBULENT FLOW AND COMBUSTION IN THE OUTLET OF OIL BURNER

针对一现场运行圆筒炉内油、气联合燃烧器燃油燃烧过程进行了详细的数值模拟。其中,对燃烧器的复杂几何形状没有进行任何简化,实现了计算区域的结构化网格划分。在前人的研究基础上发展了计算燃油液雾燃烧过程完整的数学模型,对气相的湍流流动采用k-ε模型,对液雾颗粒相的湍流流动采用随机轨道模型,对湍流燃烧采用EBU-Arrhenius模型,对辐射传热采用离散坐标模型。模拟计算成功地得到了燃烧器出口流场、温度场、组分分布以及火焰形状等详细信息,揭示了计算区域内流动、燃烧和传热过程特点。计算结果与现场测量数据吻合。

The numerical simulation of turbulent flow and oil combustion in a spot oil-gas burner was carried out. Structured grid was made with no simplification and modification of the complicated structure in the hearth and burner. The comprehensive mathematical model for simulating spray combustion was developed on the basis of previous work of other people. The turbulent flow of gas phase was modeled by κ-ε turbulent model. Particle dispersion in the turbulent flow was modeled by a stochastic method. For gas phase combustion as well as radiation heat transfer, the EBU-Arrhenius model and the discrete ordinates model were used. The detailed information about flow field, temperature field, concentration distribution and flame size in the outlet of burner was successfully obtained, presenting the basic characteristics of flow, spray combustion and heat transfer process. These simulation results are in good agreement with spot measuring data.