摘要
在许多工程领域,由于固体颗粒撞击引起的侵蚀问题一直存在,会引起异径弯管等部件出现侵蚀磨损现象。本文考虑了异径弯管中含砂介质流体对管壁冲蚀的作用,建立了异径弯管离散相DPM的模型,研究进出口管径比、中心引导线半径、流速、介质颗粒直径与介质浓度对冲蚀速率的影响。结果表明:异径弯头在含砂介质下的侵蚀区域主要位于异径弯头与小口径管的过渡部位,随着管径比的增加,异径弯头的侵蚀面积逐渐从异径弯管90°向0°扩大;在同等条件下,随着管径比的增大,异径弯管的冲蚀速率最终趋于平缓。冲蚀速率随入口速度及颗粒直径增大而增长,颗粒的质量流量、颗粒直径与冲蚀速率呈线性增长的关系;引导线直径在70~230 mm区间内,引导线直径与冲蚀率曲线呈M型。
In many engineering fields,erosion caused by solid particle impact always exists,which will cause erosion wear of the reducing pipe bending and other components.In this paper,the effect of sandy fluid on the erosion of the reducing pipe bending is explored.A discrete phase DPM model of the reducing pipe bending is established to study the effect of inlet and outlet pipe diameter ratio,central guide line radius,flow rate,medium particle diameter and medium concentration on the erosion rate.The results show that the erosion area of the reducing pipe bending in sandy medium is mainly located at the transition between the reducing elbow and the small-diameter pipe.With the increase of pipe diameter ratio,the erosion area of the reducing elbow gradually expands from 90°to 0°.Under the same conditions,with the increase of pipe diameter ratio,the erosion rate of the reducing pipe bending finally tends to be flat.The erosion rate increases with the increase of the inlet velocity and the particle diameter,and the mass flow rate of the particle,the particle diameter,and the erosion rate show a linear relationship.When the diameter of the guide line is in the range of 70 mm to 230 mm,the curve of the guide line diameter and the erosion rate is in M-shape.
作者
杨志超
谭勇
程荫
李龙飞
唐伟
刘永良
YANG Zhichao;TAN Yong;CHENG Yin;LI Longfei;TANG Wei;LIU Yongliang
出处
《现代机械》
2023年第1期59-64,共6页
Modern Machinery
关键词
管径比
冲蚀
数值模拟
异径弯管
pipe diameter ratio
erosion
numerical simulation
reducing pipe bending
作者简介
杨志超(1997-),男,湖北省武汉人,硕士研究生,研究方向:机械结构强度与振动。
