钻杆外壁清洗射流流场的数值分析  

Numerical Analysis for Jet Flow Field on Cleaning the Outer Wall of Drill Pipe

作　　者：莫丽[1] 杨琪[1] 刘海鲲 

机构地区：[1]西南石油大学,四川成都610500 [2]中国石油渤海装备中成装备公司,天津300280

出　　处：《流体机械》2015年第2期24-28,共5页Fluid Machinery

基　　金：国家科技重大专项(2011ZX05037-002)

摘　　要：在采用高压水射流清洗钻杆外壁过程中,为了得到最佳的清洗位置和清洗角度,必须提高钻杆的清洗效率和质量,文章建立了外部射流流场控制方程组,结合标准的k-ε湍流模型进行化简求解,采用ICEM CFD建立网格模型,通过Fluent软件采用VOF气液两相流模型和SIMPLE算法对喷嘴外部流场进行数值模拟分析。在一定的喷射范围内,改变喷射角度模拟对钻杆外壁的理论清洗情况,在最佳的清洗情况下确定喷头在整个清洗装置中的安装位置和喷射角度。分析结果表明:在600mm的安装距离中,随着喷射角度的减小,射流束的分流情况越来越明显,当减小到15°时,流束基本朝向一边;该喷射范围内,随着轴线位置的增大,速度和压力都呈现衰减状态,当距离超过500mm,速度衰减较明显,所以适宜的喷射距离为500mm;当喷射角度除15°和90°时衰减较大外,其余角度下衰减情况基本相同。再通过对壁面打击力的分析得出最佳的喷射角度为60°。In the process of cleaning the outer wall of drill pipe by high-pressure water jet,in order to get the best cleaning position and the angle and improve the cleaning efficiency and quality of drill pipe,author established the external jet flow control equations and solved with standard turbulence model reduction and used the ICEM CFD to establish grid model and took VOF gasliquid flow model and SIMPLE algorithm in Fluent software for numerical simulation analysis of nozzle external flow field. Within certain limits of jet,change simulation theory of the outer wall of pipe cleaning jet Angle to sure nozzle installation position and Angle in the entire unit under the condition of best cleaning. Analysis results show that in the installation of 600 mm distance,with the decrease of the jet Angle,jet beam of shunt is more and more obvious. When the jet Angle is reduced to 15 degrees,basic flow beam toward one side. Within the scope of the injection,with the increase of the axis position,speed and pressure are present state of decay. When the distance exceeds 500 mm,velocity attenuation is more apparent. So the suitable spray distance is 500 mm.When the jet Angle is 15 degrees or 90 degrees,the attenuation is bigger. The rest Angles under the attenuation are basically the same. Through the analysis of the surface force again,the best angle is 60 degrees.

关 键 词：钻杆外壁清洗 喷嘴 数值模拟分析 安装位置 喷射角度 

分 类 号：TH3[机械工程—机械制造及自动化] TP6[自动化与计算机技术—控制理论与控制工程]