论文部分内容阅读
为了了解粗煤泥干扰床分选机内流场分布特性,优化结构,利用计算流体力学方法,采用Spalart-Allmaras模型对粗煤泥干扰床分选机内的流场进行数值模拟,并对速度场和压强分布进行了研究.结果表明:分布板开孔率为0.36时,分选机内水流的轴向速度沿径向呈对称分布,上升干扰水流越大,底部流体产生的扰动越大;水流的径向速度沿径向呈不对称分布,随半径增大,在槽体壁面附近明显变小;选取变孔径的分布板,可以减小或消除壁效应,使得靠近壁面的颗粒得到有效分选;底流口的位置应该在槽体底部的负压区,固体颗粒的分选发生在高湍流区域,稳流区域有分层现象.
In order to understand the distribution characteristics of the internal flow field and optimize the structure of coarse slime disturbing bed sorter, the Spalart-Allmaras model was used to simulate the flow field in the coarse slime disturbing bed sorter by means of computational fluid dynamics Field and pressure distribution are studied.The results show that the axial velocity of the flow in the separator is symmetrical along the radial direction when the perforated ratio of the distribution plate is 0.36 and the disturbance of the flow at the bottom increases with the increase of the disturbance water flow, The radial velocity of the water flow is asymmetric along the radial direction, and decreases obviously with the increase of the radius near the wall of the tank. Selecting the variable pore size distribution plate can reduce or eliminate the wall effect and make the particles near the wall get effective points Select; the position of the bottom outlet should be at the bottom of the tank negative pressure zone, the separation of solid particles occurred in the high turbulence area, the steady flow area stratification.