水力输送管道中粗颗粒运动状态变化及其判别
发布时间：2018-08-20 07:33
【摘要】：粗颗粒运动形态变化规律是管道安全输送的关键问题.针对这一问题,利用粗颗粒管道输送试验系统,通过高速摄影技术和粒子图像测速法记录粗颗粒的运动状态及其速度变化,分析了不同粒径、不同体积浓度、不同输送速度条件下粗颗粒在管道中的水力学特性,并拟合得到粗颗粒运动状态的判定参数.研究结果显示,粗颗粒在管道中随着流体平均流速的增加依次出现扬动状态、间歇式推移状态、连续式推移状态和悬移状态,并通过不同运动状态的力学机制和能量损失分析提出了不同运动状态的变化规律;从粗颗粒安全输送的角度,提出连续式推移状态是粗颗粒在较广输送速度范围内,能够实现连续有效输送的一种运动形式,是管道运输中的颗粒物主要运动状态;从分析结果可知,粗颗粒的运动状态与流速、颗粒粒径以及颗粒浓度有关,通过引入管径和重力加速度两个参数,采用量纲分析法得到无量纲数φ为颗粒运动状态判别参数,并以此作为判定粗颗粒不同运动状态,该参数可以在工程中预测粗颗粒的运动状态.
[Abstract]:The change law of coarse particle motion is the key problem of pipeline safe transportation. In order to solve this problem, the moving state and velocity change of coarse particles were recorded by high-speed photography and particle image velocimetry, and different particle sizes and volume concentrations were analyzed. The hydraulics characteristics of coarse particles in pipeline under different conveying speeds were obtained, and the parameters for determining the motion state of coarse particles were obtained. The results show that with the increase of the average flow velocity of the fluid in the pipeline, the coarse particles appear in the order of uplift state, intermittent state, continuous state and suspended state. Through the mechanical mechanism and energy loss analysis of different moving states, the variation law of different moving states is put forward, and from the point of view of safe transportation of coarse particles, it is suggested that the continuous moving state is in a wide range of conveying speed. The main moving state of particles in pipeline transportation is a kind of moving form which can realize continuous and effective transportation. From the results of analysis, it can be seen that the movement state of coarse particles is related to the velocity of flow, particle size and particle concentration. By introducing two parameters, diameter of pipe and acceleration of gravity, dimensionless number 蠁 is obtained as the discriminant parameter of particle motion state by using dimensionless analysis method, which is used to judge the different moving states of coarse particles. This parameter can be used to predict the motion state of coarse particles in engineering.
【作者单位】： 中央民族大学环境系;
【基金】：国家自然科学基金项目(51209238;51339008;51434002) 中央民族大学大学生创新训练项目(URTP2015110055)
【分类号】：TD50
本文编号：2192889
[Abstract]:The change law of coarse particle motion is the key problem of pipeline safe transportation. In order to solve this problem, the moving state and velocity change of coarse particles were recorded by high-speed photography and particle image velocimetry, and different particle sizes and volume concentrations were analyzed. The hydraulics characteristics of coarse particles in pipeline under different conveying speeds were obtained, and the parameters for determining the motion state of coarse particles were obtained. The results show that with the increase of the average flow velocity of the fluid in the pipeline, the coarse particles appear in the order of uplift state, intermittent state, continuous state and suspended state. Through the mechanical mechanism and energy loss analysis of different moving states, the variation law of different moving states is put forward, and from the point of view of safe transportation of coarse particles, it is suggested that the continuous moving state is in a wide range of conveying speed. The main moving state of particles in pipeline transportation is a kind of moving form which can realize continuous and effective transportation. From the results of analysis, it can be seen that the movement state of coarse particles is related to the velocity of flow, particle size and particle concentration. By introducing two parameters, diameter of pipe and acceleration of gravity, dimensionless number 蠁 is obtained as the discriminant parameter of particle motion state by using dimensionless analysis method, which is used to judge the different moving states of coarse particles. This parameter can be used to predict the motion state of coarse particles in engineering.
【作者单位】： 中央民族大学环境系;
【基金】：国家自然科学基金项目(51209238;51339008;51434002) 中央民族大学大学生创新训练项目(URTP2015110055)
【分类号】：TD50
【相似文献】
中国期刊全文数据库 前5条
1 陈东;赖茂河;杨丽君;冯天然;;适用于粗颗粒矿物浮选的颗粒悬浮特性的研究[J];有色金属(选矿部分);2011年S1期
2 曹斌;夏建新;黑鹏飞;王磊;;复杂形态管道中粗颗粒水力输送的临界条件研究[J];金属矿山;2012年03期
3 宋江红;;铝土矿粗颗粒精矿再磨浮选生产实践[J];轻金属;2013年05期
4 史帅星;赖茂河;冯天然;周宏喜;;适用于粗颗粒选别的浮选机叶轮动力学研究[J];有色金属(选矿部分);2011年04期
5 ;[J];;年期
中国重要会议论文全文数据库 前2条
1 卢世杰;曹亮;杨丽君;卢刚;;国内外粗颗粒浮选机应用现状[A];第五届全国矿山采选技术进展报告会论文集[C];2006年
2 陈东;杨丽君;赖茂河;张跃军;;冶炼炉渣及粗颗粒浮选机的工业试验及应用研究[A];复杂难处理矿石选矿技术——全国选矿学术会议论文集[C];2009年
中国硕士学位论文全文数据库 前1条
1 吴磊;粗颗粒固液两相管流的数值模拟[D];杭州电子科技大学;2011年
，本文编号：2192889
本文链接：https://www.wllwen.com/kejilunwen/kuangye/2192889.html
