弯管内二次流对固粒磨损壁面的影响  

Effect of Secondary Flow on Erosion from Solid Particles in 90° Curved Duct of Quadrate Section

作　　者：毛靖儒[1] 柳成文[2] 相晓伟[1] 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049 [2]山西大学工程学院,太原030013

出　　处：《西安交通大学学报》2004年第7期746-749,共4页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(599760 3 1 ).

摘　　要：应用双流体模型在贴体坐标系下数值计算了90°方形截面弯管内稀疏气固两相的二次流动.应用气固两相动量方程在次流截面上分别采用速度是、否耦合2种求解方法,计算了固粒对壁面的磨损.计算与实验结果吻合较好.结果显示气相二次流动阻碍了固相在次流截面上冲向弯管外壁的速度,固相二次流使弯管外壁面中心区域的磨损量加大,在90°截面处达到最大值,其磨损量是同截面侧壁处的4倍,固相二次流加剧了局部磨损,从而缩短了设备的寿命.因此,该方法为抑制固相二次流提供了技术依据.The secondary flows for dilute gas-solid two-phase flow in a 90° curved duct of quadrate section are investigated numerically with two-fluid model with body-fitted-coordinates. The erosions of particle on outer wall are respectively calculated by the two kinds of methods dependent upon coupled or uncoupled velocities in the cross section of the curved duct via gas and solid phase momentum equations. The numerical results coincide with the corresponding experimental data very well. The velocities of particle rushing to the outer wall in the cross section are baffled by the secondary flow of gas phase. However the secondary flow of solid phase increases observably the erosion quantity in the center region of outer wall and the maximum erosion is 4 times as much as minimum erosion in two side regions of the outer wall in 90° section. The secondary flow of solid phase can aggravate the local erosion to result in a markedly shortened life period of facility. Thus such numerical simulation provides a technical basis for controlling secondary flow.

关 键 词：弯管 二次流 磨损 

分 类 号：O359[理学—流体力学]