中文摘要：

在充分考虑固液两相流动特点的基础上,根据钻井液离心机的结构特点和工作原理,提出了涉及初始沉降位置对离心机捕集效率影响的钻井液离心机固相颗粒沉降模型,并在此基础上提出了钻井液离心机捕集效率计算方法。该方法反映了离心机结构参数、操作参数、钻井液参数和捕集效率之间的关系。文献中捕集效率理论计算值、本文所提方法计算值和实测值之间的对比结果表明,采用本文所提方法得到的捕集效率计算值与实测值吻合度较高,证明了沉降模型和计算公式的正确性和准确性。

英文摘要：

Theoretical studies of centrifuges are very challenging due to the complex and varying flow fields involved. In particular,in the case of a drilling fluid centrifuge,the existing theory is inadequate to describe the flow field,and predict performance. In this work,based on the structural characteristics and working principles of a drilling fluid centrifuge,with full consideration of its solid and liquid flow characteristics,a sedimentation model of and a method for calculating the collection efficiency has been developed. The calculated collection efficiencies for the drilling fluid centrifuge were in good agreement with the experimental values,confirming the efficacy of our sedimentation model and calculation method. The model and method describe the regular settling of the particle in the drum,and reveal the relationship between the structural parameters,operating parameters,drilling fluid parameters and collection efficiency. The method thus provides a useful basis for the preliminary design and performance optimization of a drilling fluid centrifuge.