偏心环空非牛顿流体紊动场特性的研究  

Turbulent Property Of Non-Newtonian Fluid In Eccentric Annulus

作　　者：王艳辉[1] 

机构地区：[1]北京石油勘探开发科学研究院,北京100083

出　　处：《水动力学研究与进展（A辑）》1997年第2期150-156,共7页Chinese Journal of Hydrodynamics

摘　　要：在石油钻井工程中普遍存在偏心环形空间内的流动.本文从偏心环空轴向流的层流方程与非牛顿流体的本构关系出发,分析了流态转换的临界条件与局部紊流的发展过程,并在忽略环空断面两次流的基础上,利用Prandtl边界层理论建立起紊动方程及时均流速方程.最后,根据计算讨论了流体流变性、环空几何参数对流场分布的影响,结果表明环空偏心度是引起流场分布不均匀的主要参数,调整环空儿何结构与流体流变性均对获得设计的流场,对钻井、固井与完井等具有重要的指导意义.Annular flow is very popular in oil drilling engineering. Here> based on laminary equation and constitutive relation of non-Newtonian fluid, the critical velocity of flow translating and the evolution of partially developed turbulence are analyzed. Neglecting the secondary flow of annular cross section, the turbulent equation and time-average velocity are proposed with Prandtl layer theory. Finally, It is discussed that how the rheo-logical parameters and annular geometries affect flow field,and eccentricity e is the main factor controlling,annular flow, many suggests are given.

关 键 词：非牛顿流体 环形空间流动 流态转换 紊流 

分 类 号：O373[理学—流体力学]