切向燃烧炉膛中网格划分方法对数值模拟的影响

Effect of Methods of Dividing Grid on Numerical Simulation for Tangentially Fired Furnace

针对四角切向燃烧煤粉锅炉在进行数值模拟过程中的特性，采用两种网格划分方法－与壁面平行和与壁面倾斜成４５ｏ的网格（简称方法ａ和方法ｂ），对计算过程中燃烧器出口附近的伪扩散现象进行了分析，指出采用方法ｂ可以有效避免燃烧器出口附近的伪扩散现象，计算结果与实验值吻合得较好。建议在模拟四角切向燃烧煤粉锅炉燃烧器区域的气流流动工况时，采用本文提出网格划分方法ｂ。

This paper introduces briefly two methods of dividing grid in a numerical simulating tangentially fired pulverized coal boiler, which are the method of parallel to water wall and the method of inclining 45°to water wall (method A and method B) False diffusion phenomenon near the exit of the burner is analyzed It is pointed out that method A can avoid it effectively The calculated results are concordant with expermental results successfully Method A is proposedin simulating on aerodynamic field in the combustor zone of the tangentially fired pulverized coal boiler