摘要
振荡腔室内流场特性是研究钻井水力它激振荡的重要内容。文章首次把数值模拟的方法应用到对它激振荡腔室内流场的研究中,采用湍流的Girimaji非线性模型能很好地模拟腔室内的流场。通过数值模拟,描述了腔室内流场的特性,找出了它激振荡腔室自增流量与腔室结构参数及流体性质之间的关系。模拟结果表明:腔室结构和流体性质对自增流量有着很大的影响,并且规律性很强。喷嘴直径比值和上喷嘴流量是最主要的两个因素,在模拟条件下,最优喷嘴直径比值为1.5,自增流量随着入口流量的增加而增大。流体性质具有一定影响。
The behavior of oscillation chamber flow field is an important content of studying drilling hydraulic independent excitation oscillation. The numerical simulation was firstly applied to the study of the chamber flow field of independent excitation oscillation by the authors. The chamber flow field can be well simulated by use of the Girimaji nonlinear model of turbulent flow. By numerical simulation, the behavior of oscillation chamber flow field was described and the relation between the chamber self-increasing flow rate of independent excitation oscillation and the chamber structural parameters and fluid property was found out. The simulation results indicated that the effects of chamber structure and fluid property on self-increasing flow rate were very great with strong regularity; the ratio between top and bottom jet nozzle diameters and the flow rate of top jet nozzle were the two most important factors; and, under simulation conditions, the optimal nozzle diameter ratio was 1.5 and the self-increasing flow rate increased along with the increase in entrance flow rate.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2005年第4期79-82,共4页
Natural Gas Industry
基金
国家自然科学基金资助项目
重大研究计划(90210022)成果
