旋风分离器内三维强旋湍流流动数值模拟的修正压力应变项模型

A MODIFIED PRESSURE-STRAIN MODEL FOR SIMULATING STRONGLY SWIRLING FLOWS IN A CYCLONE SEPARATOR

针对旋风分离器内强旋流动的数值模拟,改进了雷诺应力方程压力应变项的IPCM+wall模型,加入到FLUENT6.0软件平台上。分别用修正的和标准的IPCM+wall模型、IPCM模型以及SSG模型,对蜗壳式旋风分离器内三维湍流流动进行了数值模拟,给出了分离空间和灰斗内的时平均速度和雷诺应力分量的分布,并用LDV测量结果加以检验。研究结果表明,修正的IPCM+wall模型对切向和轴向速度、切向和轴向正应力以及轴-切剪应力的预报值与实测值的吻合比其他压力应变项模型的好得多。

The Isotropization of Production and Convection plus wall reflection pressure-strain model （IPCM plus wall model） in the Reynolds stress equation is modified for simulating strongly swirling turbulent flows in cyclone separators and is incorporated into the platform of FLUENT 6.0. The three-dimensional turbulent flows in a volute cyclone separator are simulated using modified and standard Isotropization of Production and Convection plus wall reflection models, the Isotropization of Production and Convection models （IPCM models） as well as the Quadratic Pressure-Strain Model （SSG model）. Predictions of the time-averaged velocities and Reynolds stresses in the separation space and dust hopper are verified by LDV experimental results. The results indicate that tangential and axial velocities, normal Reynolds stress components, as well as shear stresses predicted using the modified IPCM plus wall model are much better than those obtained using other pressure-strain models.