论文部分内容阅读
在石油输送工业中,由于弯头内压力梯度、离心力、二次流等多种因素的作用,导致弯头内的冲蚀过程特别复杂,冲蚀破坏也十分严重。本文针对液固两相流条件下颗粒对弯管的冲蚀破坏,采用DPM模型,对离散相在拉格朗日框架下求解颗粒轨道方程,得出颗粒与壁面的碰撞信息,再将碰撞信息应用于冲蚀模型,从而预测出颗粒对弯管壁面的冲蚀破坏情况,并研究了颗粒斯托克斯数对冲蚀严重区域的影响。计算结果表明:冲蚀主要发生在弯管与出口直管连接处的外拱壁以及靠近弯头出口的直管段侧壁区域;当颗粒斯托克斯数较大时,由于二次流对颗粒的携带作用不充分,导致靠近弯头出口的直管段侧壁区域未出现严重冲蚀。
In the oil transportation industry, due to the pressure gradient, centrifugal force, secondary flow and other factors in the elbow, the erosion process in the elbow is particularly complicated and the erosion damage is very serious. In this paper, according to the erosion damage of the elbow to the elbow under the condition of liquid-solid two-phase flow, DPM model is used to solve the orbital equation of the discrete phase under Lagrangian framework, and the collision information between the granule and the wall is obtained. Applied to the erosion model to predict the erosion of the elbow wall damage particles, and studied the Stokes number of particles on the impact of severe erosion area. The results show that the erosion mainly occurs in the outer arch wall where the elbow pipe is connected to the outlet straight pipe and the straight pipe wall side wall area close to the elbow outlet. When the Stokes number of the particle is large, Of the carrying effect is not sufficient, resulting in close to the elbow straight pipe wall area without serious erosion.