圆形喷嘴射流特性模拟方法优化选择

Optimization of Numerical Simulation for Characteristic of Circular Nozzle Jet

为提高圆形喷嘴射流特性数值模拟研究的准确性、可靠性,分别采用标准k-ε、RNG k-ε、SST k-ω、标准k-ω等4种湍流模型、3种网格划分方案及2种控制方程离散格式对圆形喷嘴射流流场特性进行数值模拟.研究结果表明:与标准k-ε、SST k-ω、标准k-ω三种湍流模型相比,RNG k-ε更能真实地反映圆形喷嘴射流流场特性;在网格划分方案的比较中,方案1所得的平均扭曲率最小,为0.187;对QUICK和二阶迎风格式两种控制方程离散格式的对比发现,二阶迎风格式所得到的轴向速度分布模拟结果更接近实验值.

To improve the accuracy and reliability of the numerical study for circular nozzle jet, four tur- bulent models,three kinds of mesh generations and two discretization schemes were used to simulate the characteristic of the circular nozzle jet flow field in this paper. The result showed that RNG k-e model could reflect the real circular nozzle jet flow field more accurately than another three turbulent models. It turned out that the average skewness of the first meshing scheme was the minimum. At last, taking the two discretization schemes into consideration,it was found that second order upwind got a closer result to the experimental value than QUICK discretization scheme.