输气管路弯头内壁面冲蚀进化的试验和数值模拟研究

砂粒的连续冲击使输气管路弯头内壁面连续不均匀地发生着冲蚀进化现象.本文作者基于3D成像技术精确描述了R/D=1.5弯头内壁冲蚀进化过程,并采用CFD方法对该过程进行了数值模拟研究.结果显示,随着颗粒冲击,磨损严重的区域向弯头圆心角高角度扩散的速度较大;通过修正Schiller Naumann拽力系数模型可较准确地模拟弯头的冲蚀进化过程(平均误差小于0.15 mm).以上工作对管路的完整性评价具有重要意义.

Experimental and Numerical Study of Surface Erosion Evolution at Inner Wall of Elbow in Gas flow Line

During the running process of the gas flow line, the inner wall of the elbow was continuously eroded by sand particles, the evolution of surface profile changed continuously and unevenly. Based on the 3D imaging technology, the evolution of surface profile process was accurately described and a CFD method was proposed to study the process. Results show that with the continuous erosion, the severity of wall thickness loss had a larger diffusive velocity toward higher angle direction. The Schiller Naumann drag coefficient model was modified to predict the erosion pattern on the inner wall. These works was of great significance in evaluating the integrity of the piping.