轴入式旋风分离器分步湍流模型的数值模拟与试验

Numerical Simulation and Test of the Two-stage Turbulence Model of Axis-in Cyclone Separator

针对轴入式旋风分离器的气相流场,提出了一种基于RNGκ-ε模型和雷诺应力模型的分布湍流模型并进行模拟研究.首先对5种分离器模型的气相流场采用RNGκ-ε模型进行模拟.待气相场趋于稳定时,加入离散颗粒相,对气相改用雷诺应力模型模拟;根据已得到的流场对颗粒相采用随机轨道模型,分析分离器阻力与效率性能.最后将典型模型的模拟结果与试验结果进行比较,二者吻合良好.基于分步湍流模型的数值模拟方法在研究轴入式旋风分离器的气相流场是可靠的.

To analyze the gas flow in an axis-in cyclone separator, a two-stage turbulence model based on the RNGκ-ε model combined with the Reynolds stress model was developed. The RNG κ-ε model was first used for the gas-phase of five cases of the cyclone. When the gas flow field was stable, the particle phase was added to the gas-phase and the Reynolds stress model was used for the gas-phase. A stochastic trajectory model was employed for the particle phase on the basis of the gas flow field, and the resistance and efficiency of the cycione were calculated. Finally, a typical case was measured. The results agree reasonably well with the numerical results. Therefore, the simulation method based on the two-stage turbulence model is reliable for the study of the gas flow in axis-in cyclone separators.