炉膛中间截面边界条件对双切圆锅炉空气动力场计算的影响

大容量超超临界锅炉广泛采用单炉膛双切圆的空气动力组织方式,在计算流体力学软件FLUENT平台上,针对1GW超超临界单炉膛双切圆锅炉,计算了全炉膛和炉膛中间截面边界条件设为对称面和边壁条件的炉内空气动力场。计算表明,与标准κ-ε双方程模型相比雷诺应力模型(RSM)具有更高的计算精度;中间截面采用对称边界条件时,其流场分布规律与全炉膛模拟结果相似;中间截面为边壁条件时炉膛中间截面附近流速降低,但对整个炉膛流场影响较小;中间截面采用这两种边界条件均会导致1#、6#角射流衰减缓慢而冲刷炉膛前墙中间水冷壁。

The Effect of the Midsection Boundary Condition to the Aerodynamic Field of the Dual Circle Tangential Furnace

Dual circle tangential firing single chamber boiler is widely used for Ultra Super Critical boiler（USC）.The computational Fluid Dynamics（CFD） code FLUENT was employed for a 1GW Ultra Super Critical boiler dual circle tangential firing single chamber boiler to model the aerodynamic of the whole furnace and the furnace with Midsection using symmetry boundary condition and wall boundary conditions.The numerical results showed that Reynolds stress model（RSM） is more accurate compared to the standard κ-ε two equitation model,.The aerodynamic of the furnace with Midsection using symmetry boundary condition is similar to the case that modeling the whole furnace.Lower velocity occurs in the nearby section of the Midsection with wall boundary condition,but the whole flow field is less affected.However,the Midsection using both boundary conditions result in 1#,6# corner of jet attenuation slow and scour the water cooling wall in the center of front wall,over-estimated front water wall slag and high temperature corrosion.