摘要
采用标准模 k- ε型、RNG k- ε模型和 DSM模型 ,对液 -液旋流管中的单相强旋湍流进行了数值模拟 ,结果表明3种模型中以 DSM模型的预报结果最为合理 ,不仅对切向速度分布的 Rankine涡结构和轴向速度分布的近轴回流区作出了较合理的预报 ,而且揭示了 Reynolds应力的各向异性特性 ,但同实验值仍存在有一定的差别 ,尤其是在旋流管的入口附近其误差更为明显 ,分析认为除湍流模型本身的原因外 ,可以与采用 2维轴对称的计算假设以及边界条件的选择也有关 ,如若在真 3维条件下进行数值计算 。
The strongly swirling turbulent flow in a liquid liquid hydrocyclone is simulated using the k ε , RNG k ε and Reynolds stress equation models (DSM). The results show that the DSM model is superior among the three turbulence models. It correctly predicts the Ranking vortex of tangential velocity and the axial reverse flow in the core and also reveals the anisotropic behavior of the Reynolds stresses. Some discrepancy still remain between the simulation results of the DSM model and the LDV measurements. The reasons are not only attributed to the turbulence model, but also to the simplification of the two dimensional model and the exit boundary conditions. Three dimensional simulation would provide improved results.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2001年第2期105-109,共5页
Journal of Tsinghua University(Science and Technology)
关键词
旋流器
油水分离
湍流模型
数值模拟
旋流分离
hydrocyclone
oil/water separation
turbulence model
numerical simulation
