进口入射角对卧螺离心机内流场的影响

利用Solidworks软件对卧螺离心机螺旋流道内流体进行三维建模,结合CFD软件后处理fluent选用RNG k-ε湍流模型与多重参考系(MRF)模型,选取4种进口入射角对离心机内固液两相流进行模拟仿真。仿真表明:进口入射角为30°时,进料口向卧螺离心机内输送污泥对整个流体流场扰动较小,且出渣口污泥含水率较低。模拟仿真所采用的计算模型基本符合卧螺离心机内部的实际流动情况,结果为进一步研究离心机特征参数对其分离效果的影响和结构优化提供了理论依据。

Influence of import incidence angle on flow field of horizontal screw decanter centrifuge

Build 3D model for the flow field in spiral flow channel of horizontal screw decanter centrifuge.Combined with post-processing CFD software fluent,RNG k-ε turbulence model and multiple reference frame（MRF） model,the 3D model serves to simulate solid-liquid phase flow in centrifuge when the import incidence angle varies in four kinds of angles.The results show that,when the incidence angle is 30°,the sludge fed through import causes smaller disturbance to flow field,the moisture of sludge is lower in taphole.The model could basically reflect the actual flow situation.The simulation results provide reference for analyzing the influence of centrifuge parameters on separation effect and optimizing structures of centrifuge.