作　　者： ; ; ; ;

机构地区： 上海交通大学机械与动力工程学院

出　　处： 《动力工程》 2004年第3期436-441,共6页

摘　　要： 采用Fluent软件对一切向进口旋风分离器内的气相流场和颗粒分离效率进行了三维数值研究。用RNG(重整化群)k-ε模型模拟气相紊流特性。研究表明,分离器内气流的切向速度分布呈复合双层结构;轴向速度方向在内外层分布不同,外层向下,内层向上,但部分断面轴心处的轴向速度出现了下降流动特征。流场的计算结果与实验结果进行了对比,表明RNGk-ε模型能较好地模拟分离器内的强旋流场。采用拉格朗日模型对固相颗粒的轨迹进行了模拟,研究了颗粒的进口位置、进口速度以及分离器排气管直径对分离效率的影响,表明颗粒进口位置和进口速度对颗粒的分离效率有较大影响;排气管直径越小,颗粒相分离效率越大,但当排气管直径减小到一定幅度时,效率提高的幅度减小。 An investigation has been carried out to study the gas phase and the collection efficiency for cyclone separator based on the Fluent software. The RNG k-ε turbulent model was used to simulate the gas flow, and it showed that the distribution of the tangential velocity is composed of inner and external vortex, and in some middle of cyclone separator, the axial velocity is decreased, even the direction is reversed, which will reduce the collection efficiency of cyclone. In order to prove the credibility of numerical model, an experiment with five-orifice pilot was made to measure the velocity distribution of gas-phase and the comparison showed that the model is reliable for simulation of cyclone separator. The trajectory of particles was solved by using the Lagrangian model. It shows that the collection efficiency of particles is greatly affected by the inlet position and the inlet gas velocity; in addition, the efficiency increases with the decrease of exit diameter. Figs 10 and refs 9.

关 键 词： 动力机械工程 旋风分离器 数值研究 拉格朗日模型 分离效率

领　　域： [动力工程及工程热物理]