碟式分离机模型转鼓压力场速度场数值模拟

Numerical Simulation of Pressure Field and Velocity Field in Drum of Disc Separator

为探究碟式分离机转鼓高速离心流场特性,以胶乳分离机转鼓为研究对象,建立具有30张碟片和完整结构的缩小转鼓三维物理模型,通过网格划分、边界条件设置,运用流体FLUENT软件中的混合多相流和标准湍流模型,对转鼓内压力场和速度场进行了数值模拟与分析。结果表明,压力云图和速度云图呈现了进料、碟片分离、重相和轻相区域的压力和速度变化规律,喇叭管下方呈负压状态,重相、轻相沿出料路径压力逐渐递减,出口区域均呈负压状态,压力与半径呈二次型正比关系,速度与半径成正比关系。在7 250 r/min转速下,在转鼓体内壁处出现最大液体压力,最大压力仿真值为6.5×10~5Pa,最大速度出现在转鼓体内壁处,其仿真值为37.9 m/s,喇叭管内液体速度值最小,重相、轻相的速度沿各自排料路径逐渐下降,在总速度中周向速度起主导作用。研究方法和结果为深入研究离心机流场、结构强度优化等具有指导意义和借鉴价值。

In order to investigate the characteristics of high-speed centrifugal flow field of disc separator,using drum of latex separator as the research object,the three-dimensional physical model of drum with 30 discs and complete structure was established in this paper. Through grid partition and boundary condition setting,the pressure field and velocity field in the drum are numerically simulated and analyzed by using the mixed multiphase flow and standard turbulence model in the FLUENT software. The results show that the pressure and velocity cloud images show the variation of pressure and velocity in feeding,disc separation,heavy phase and light phase region,the bottom of the horn is negative pressure state,the pressure of heavy phase and light phase is decreasing gradually along the discharge path; while the outlet area is negative pressure state,the pressure is directly proportional to the radius into a quadratic liner relationship,the velocity is directly proportional to the radius into liner relationship. When the speed is 7 250 r/min,the maximum fluid pressure appears at the wall of the drum,the maximum pressure simulation value is 6.5×10~5 Pa,the maximum speed appears in the drum body wall,and the simulation value is 37.9 m/s,the liquid velocity in the horn tube is the minimum,and the velocity of the heavy phase and light phase decreases gradually along the respective discharging path,the circumferential velocity plays a leading role in the total velocity.The research methods and results have the guiding significance and reference value for further study of the centrifuge flow field and structural strength optimization.