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采用雷诺平均的计算流体力学方法,通过模拟与燃烧室模态相似的标准旋流扩散燃烧实验以及合成气模型旋流燃烧室实验,分析了4种湍流模型对旋流燃烧及合成气燃烧室的数值模拟结果的影响。对比标准实验的速度、温度以及混合分数等实验数据,讨论不同模型以及参数取值的模拟效果,选取最合适燃烧室内复杂流型预测的realizableκ-ε湍流模型,并对位于湍流动能耗散率(ε)方程源项中的模型常数C2做出修正。耦合相应较为准确的燃烧模型以及反应机理,形成针对合成气燃烧室性能预测的较为理想的模拟方法。开展合成气模型旋流燃烧室燃烧实验,利用形成的数值模拟方法,对燃烧室壁温及NOx排放进行了预测,结果与实验较吻合,验证模拟方法可靠。
By using Reynolds-averaged computational fluid dynamics (CFD) method, four kinds of turbulence models were simulated for the cyclone combustion and syngas combustor by simulating the standard cyclone diffusion combustion model similar to that of the combustion chamber and the swirling combustion chamber experiment of the syngas model. Effect of numerical simulation results. Comparing experimental data of standard experiment such as velocity, temperature and mixing fraction, the simulation results of different models and parameter values are discussed. The realizable κ-ε turbulence model which is most suitable for the prediction of complex flow patterns in a combustion chamber is selected, and the turbulent kinetic energy dissipation rate ε), the model constant C2 in the source term is modified. Coupling the more accurate combustion model and reaction mechanism, the formation of a more ideal simulation method for syngas combustion chamber performance prediction. The combustion experiment of the swirling combustor in the syngas model is carried out. The numerical simulation method is used to predict the combustion chamber wall temperature and NOx emissions. The results are in good agreement with the experimental results and the simulation method is reliable.