钻井液离心机进料腔的优化设计

Optimum Design of Feeding Chamber of Drilling Fluid Centrifuge

为解决钻井液离心机工作时出现的物料分布不均、切向速度滞后等问题,借鉴风机等旋转机械中的叶片设计理论,对离心机进料腔进行了优化设计。采用CFD数值模拟方法,对比不同出口安置角、不同叶片安装角度下的流场的切向速度及湍流强度。得到叶片最优参数为:进口安置角β_(1)为34°,出口安置角β_(2)为120°,叶片偏离进料腔出口两侧面。相比于常规型离心机,加速型离心机在分离钻井液时,可处理更小粒径的钻井液,减少了切向速度滞后、物料分布不均等现象。

In order to solve the problems of uneven material distribution and tangential velocity lag when the drilling fluid centrifuge works,the optimal design of the feeding cavity of the centrifuge was carried out by referring to the blade design theory in rotating machinery such as fans.Using the CFD numerical simulation method,the tangential velocity and turbulence intensity of the flow field under different outlet placement angles and different blade installation angles were compared.The optimal parameters of the blade were obtained:the inlet placement angleβ_(1) was 34°,the outlet placement angleβ_(2) was 120°,and the blade deviated from both sides of the outlet of the feed cavity.Compared with conventional centrifuges,accelerated centrifuges could handle drilling fluids with smaller particle sizes when separating drilling fluids,reducing tangential velocity lag and uneven material distribution.