复合式水力旋流器内部流场的数值模拟

Numerical simulation of internal flow field in compound hydrocyclone

复合式水力旋流器是综合了动态和静态旋流器各自优点的新型水力旋流器。采用修正的RNGK ε模型,对复合式水力旋流器内部流场进行了数值模拟。计算结果与实验所得数据基本吻合,证明了模型和算法的正确性。其中,轴向速度和切向速度的数值模拟结果和实际测量结果非常接近;在器壁附近的外自由涡区,切向速度的数值计算与实际测量数值基本一致。对径向速度分布规律的模拟将有助于对旋流器的结构及性能的分析,所建立的数学模型和所使用的计算方法为进一步研究复合式水力旋流器的分离机理、流场特性及结构优化设计提供了一条有效的途径。

Compound hydrocyclone is a new hydrocyclone based on the advantages of dynamic cyclone and static cyclone. The internal flow field of compound hydrocyclone was simulated using amended RNG K-ε model. The simulation result is in accordance with the experimental data, which proves the correctness of mathematical model and computation. The numerical simulation values of axial velocity and tangential velocity are very approach to the experimental result. The simulated distribution law of radial velocity benefits the cyclone structure and performance analyses. The mathematical model and computing method can be used to forecast the internal flow field of compound hydrocyclone and can also provide an effective way for the study of compound hydrocyclone such as separation mechanism, flow field characteristics and structural optimization design.