摘要
对旋流分离器流场计算流体力学研究中的湍流模型、网格划分方案、控制方程离散格式及计算步骤等内容的选择进行了分析.通过与流场测量数据进行对比,指出雷诺应力模型比RNG k-ε模型更能表征分离器切向速度场的组合涡特征;非结构六面体网格划分方案的预测结果更精确;二阶迎风格式的模拟精度并不一定比QUICK格式的模拟精度差,在分离器结构设计及网格划分较复杂的情况下,推荐使用二阶迎风格式;在PISO算法的非稳态计算条件下,收敛残差量级可达10-6以上.优选的流场模拟研究方法可用于分离器流场分析及指导分离器工程设计.
In response to the study of cyclone separator with more and more complicated structural design, the computational fluid dynamics methods consisting of turbulence models, meshing schemes, governing equation discretization schemes and computation steps were analyzed. Comparison with experiments shows that Reynolds stress model can characterize Rankin vortex in tangential velocity field more suitably than RNG κ-εmodel; The achieved prediction on unstructured hexahedron grids is more accurate; Simulation accuracy of the second order upwind is not worse than QUICK. In the case of complicated separator structure design and mesh generation, the second order upwind scheme is recommend. Under the condition of unsteady PISO algorithm, the residual error precision can reach over 10^-6. The optimized numerical simulation methods can be used to analyze flow field in cyclone separator and conduct engineering design.
出处
《过程工程学报》
CAS
CSCD
北大核心
2013年第5期721-727,共7页
The Chinese Journal of Process Engineering
基金
国家科技重大专项资助项目(编号:2011ZX05026-004)
中央高校基本科研业务费专项资金资助项目(编号:12CX06074A)
关键词
旋流分离器
数值模拟
湍流模型
流场
cyclone separator
numerical simulation
turbulence model
flow field
