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构造强守恒形式N S离散方程组,耦合求解速度和压力修正方程,k ε双方程模型模拟湍流粘性。在方程离散中,采用以加权平均方法计算胞元界面上不连续的几何因子,以保持坐标转换的光滑性;以迭代方式考虑交错压力梯度项,并对常规形式压力方程结果进行二次修正。计算结果表明,针对局部非光滑且远离正交性的炉内网格体系,上述特殊数值方法对保证求解精度和收敛性具有关键作用。采用3D PDA(三维激光多谱勒固粒运动分析仪)对670t/h四角切圆炉的1:20模型内冷态流场进行了测量。数值模拟结果与实验结果基本吻合。
Construct strongly conserved forms of N S discrete equations, coupled to solve the velocity and pressure correction equations, k ε two-equation model to simulate turbulent viscosity. In the equation discretization, we use the weighted average method to calculate the geometric factors of discontinuities on the cell interface to maintain the smoothness of the coordinate transformation. The staggered pressure gradient term is considered iteratively and the second-order correction is made on the results of the conventional formal pressure equation. The calculation results show that the above special numerical method is crucial to ensure the accuracy and convergence of the solution for locally in-furnace grids that are not smooth and far away from orthogonality. The 3D PDA (3D laser Doppler particle motion analyzer) was used to measure the flow field in a 1:20 model of a 670 t / h tangential furnace. The numerical simulation results are basically consistent with the experimental results.