摘要
推导了综合雷诺数与料浆温度的数学模型,建立了料浆管道输送L管模型,基于数值模拟研究不同温度、管径及初始流速下的料浆输送阻力损失变化特征.结果表明:随料浆温度升高,综合雷诺数增加,经判断本试验料浆流态均为结构流;利用环管试验数据进行验证,料浆流动模型所测误差为4.9%及5.3%,说明该模型具有合理性与可靠性;随料浆温度升高,料浆输送阻力损失减小;随管径增大,料浆阻力损失降低,变化趋势逐渐减缓,平均减小率分别为24.5%和10.9%,阻力损失"拐点"管径为190 mm;随初始流速增加,料浆输送阻力损失增大,增加趋势随流速增大而变大,平均增长率分别是10.7%和17.7%,存在阻力损失"转折点"流速为2.4 m/s;建议矿山充填管道输送参数选取管径190 mm,初始流速2.4 m/s,温度保持在30~50℃.
The comprehensive Reynolds number was deduced and the mathematical model of slurry temperature,slurry pipeline transportation L tube model were established,based on the numerical simulation research under different temperature,pipe diameter and initial velocity of slurry transportation resistance loss variation characteristics.The result shows that:as the slurry temperature increases,the comprehensive Reynolds number increases,and it is judged that the slurry flow pattern in this test is structural flow.The data of the loop test that the measured errors of the slurry flow model were 4.9% and 5.3%,indicating the rationality and reliability of the model.As slurry temperature increases,slurry transport resistance loss decreases.With the increase of pipe diameter,slurry resistance loss decreased and the trend of change gradually slowed down.The average reduction rate was 24.5% and 10.9% respectively,and the pipe diameter at the"inflection point"of resistance loss was 190 mm.With the increase of the initial velocity,the slurry transportation resistance loss increased,and the increasing trend increased with the increase of the velocity,with an average growth rate of 10.7% and 17.7%,respectively.The velocity at a"turning point"of resistance loss was 2.4 m/s.It is suggested to select the pipe diameter of 190 mm,the initial flow rate of 2.4 m/s and the temperature to be kept at 30—50℃.
作者
甘德清
孙海宽
薛振林
闫泽鹏
GAN Deqing;SUN Haikuan;XUE Zhenlin;YAN Zepeng(School of Mining Engineering,North China University of Science and Technology,Tangshan,Hebei 063200,China)
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2021年第2期248-255,共8页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(51774137)
国家自然科学基金青年基金项目(51804121)。
关键词
料浆温度
数值模拟
大流量输送
流态演化
阻力损失
slurry temperature
numerical simulation
large flow conveying
evolution of flow pattern
resistance loss
