旋风分离器内高速旋转流场的数值计算方法选择

Selection of numerical approaches to calculate the high-speed rotating flow field within a cyclone separator

数值计算方法已成为研究旋风分离器内部流场的重要途径。利用计算流体力学方法对旋风分离器内部气相流场进行了数值模拟研究。分析了不同湍流模型、离散化方式和压力插值方式对旋风分离器内部计算流场的影响,并将所得数值结果与已知的实验数据进行了对比,以期得到最适合的数值模型。结果表明:对于旋风分离器内部复杂流场的流动,运用雷诺应力模型(Low-Re Stress-Omega)能够较好地预测出强制涡中心涡流的运动情况,同时采用SIMPLEC算法、二阶迎风离散化方式和PRESTO压力梯度插补格式能够获得最好的预报结果。

Numerical method has become an important way for studying the flow field within cyclone separators. This paper adopted the method of computational fluid dynamics （CFD） to conduct a numerical simulation for the gas flow field of a cyclone separator. It analyzed the effects of different turbulence models, discretization scheme and pres- sure interpolation scheme on the flow field, and thereafter, compared the obtained numerical results with the known experimental data, aiming to find the most appropriate numerical model. The results showed that for the complicated high-speed rotating flow field in the cyclone separator, Reynolds Stress （Low-Re Stress-Omega）Model was a relatively efficient method to predict the movement of the central forced vortex. Meanwhile,by applying the SIMPLEC method,the Second order upwind discretization scheme and the PRESTO pressure interpolation method,optimized simulation results were obtained.