Comparison study on three turbulence-chemistry interaction models in numerical simulation of coal gasification

In order to obtain the applicability and accuracy of commonly used turbulence-chemistry interaction models in the numerical simulation of coal gasification,a numerical simulation was performed using three turbulence-chemistry interaction models,and the temperature field,concentration field and carbon conversion distributions were analyzed and compared with experimental data. The results show that the turbulence-chemistry interaction model has great influence on the temperature and concentration field at the flame zone,while it has little influence on the lower part of the gasifi- er;the EDM model presents a large prediction error for the concentration distribution of gas compositions;the PDF model based on single mixture fraction gives unreasonable temperature and concentration field near the nozzle outlet, while it gives accurate results at the gasifier outlet;the EDC model gives satisfactory predictions except for overestima- ting the flame temperature,it is noted that considering elementary reactions and detailed chemical reaction mechanism can further improve the accuracy of predicting the flame temperature.