摘要
利用三维激光多普勒测速仪(LDV)对不同浓度的添加剂射流在淹没条件下的时均流场进行了测量。结果表明,添加剂射流的结构可分为初始段、过渡段和基本段三个区域,在试验浓度范围内,添加剂射流比清水射流的等速核长,浓度为100—200 mg/L时等速核最长,无因次等速核长度约为5.39—5.46,之后随着浓度的增加,等速核逐渐变短。在基本段内断面轴向时均速度分布具有自模性,浓度越大轴心速度衰减越快,射流的边界扩展越大。
The measurements of the turbulent submerged jets in ations have been conducted using a Tri-dimenstonal different concentr Laser Doppler Velocimetry. The additive is polyarylamide (PAM). The test results indicate that the structure of the additive jets can be divided into three parts, which are the beginning section , transition section and basic section. The dimen-sionless potential core length of the additive jet is longer than that of the water jet in the concentration range of the test, the concentration of the longest di-mensionless potential core is between 100 mg/L and200 mg/L, the length of the core shortens with the increase of concentration. The time-averaged axial velocity distribution is similar in the basic section. The higher the concentration is, the faster the cen-terline velocity decays, and the wider the jet border expands.
出处
《钻井液与完井液》
CAS
1999年第6期1-3,23,共4页
Drilling Fluid & Completion Fluid
