CAJ | 학술논문

　　在回转窑内同时存在物料颗粒的轴向运动和横截面运动，其横截面物料流动特性对物料的混合及能量分布有着重要影响。应用双流体模型，结合颗粒流动理学理论，数值模拟横截面内物料流动特性，应用文献中的实验对所建立的数学模型进行有效性验证。结果表明，数值计算与实验结果吻合较好。回转窑横截面内物料运动分层，表面活动层速度较大，内部被动层速度较小；表面物料速度方向并非与表面平行。实际工程尺度回转窑内，物料表面呈现一定的波动；窑内气体受物料运动影响较大，会产生旋涡及扬沙，卷起少量物料冲击物料表面。
　　재회전요내동시존재물료과립적축향운동화횡절면운동，기횡절면물료류동특성대물료적혼합급능량분포유착중요영향。응용쌍류체모형，결합과립류동이학이론，수치모의횡절면내물료류동특성，응용문헌중적실험대소건립적수학모형진행유효성험증。결과표명，수치계산여실험결과문합교호。회전요횡절면내물료운동분층，표면활동층속도교대，내부피동층속도교소；표면물료속도방향병비여표면평행。실제공정척도회전요내，물료표면정현일정적파동；요내기체수물료운동영향교대，회산생선와급양사，권기소량물료충격물료표면。
In a rotary kiln there are motions of material particles in both axial and transverse sections. The material flow characteristics in the cross section have important influence on the material mixing and energy distribution. An Enlerian two?fluid model coupled with the kinetic theory of granular flow was applied to simulate the material flow characteristics in the cross section in the cement rotary kiln, and validated against experimental data from the litera?ture. The results of numerical calculation were in good agreement with the measurement. Results show that the mate?rial movement in the rotary kiln cross?section is stratified. In the active surface layer the velocity is larger, while in the internal passive layer the velocity is small. The velocity vectors within the active layer are not parallel to the bed surface. In an actual rotary kiln of engineering scale, there exist waves at the bed free surface;and the gas in the kiln is affected significantly by the granular motion; vortices and flying sand are produced impacting the bed sur?face.