摘要
为了揭示水力提升过程中颗粒运动诱发的压力波动,开展以水为循环工质、圆形玻璃珠为颗粒的垂直管水力提升实验,利用多路压力变送器测量实验段不同位置的压力信号,利用高速摄影仪对透明实验段内颗粒运动进行直接观测,结合差压信号互相关系数及颗粒运动图像确定代表性压力信号,运用统计分析和快速傅里叶变换进行信号处理,提取差压均值pv、差压平均幅值Av、主峰频率fp、频率主峰幅值Afp和时频熵S等时频域特征参数。研究结果表明:距基准面向上0.5倍管道内径处的取压孔能够更加准确、灵敏地检测到颗粒流的特性;差压均值等时频域特征参数与管道内压力波动之间未呈现出明显的规律性;以AvS和Afp/S这2个组合参数为基础建立的实验关联式的相关系数分别高达0.982和0.952,拟合值与实验值的相对误差分别为0.36%～1.68%和1.05%～5.02%。
In order to reveal the pressure fluctuation induced by particle movement in hydraulic lifting processes,experiments were carried out in a vertical pipe with water as circulating working medium and circular glass beads as particles.The pressure signals at different positions in the experimental section were measured by several pressure transmitters,and the particle motion in the transparent experimental section was observed directly with high speed photographer.The representative pressure signal was determined by analyzing the correlation coefficients of the differential pressure signals and the particle motion images.Using statistical analysis and fast Fourier transform,the average differential pressure p v,average amplitude of differential pressure A v,peak frequency f p,peak frequency amplitude A fp and time-frequency entropy S were extracted.The results show that the characteristics of the particle flow can be detected more accurately and sensitively by the pressure port at 0.5 times of the inner diameter of the pipe.There is no obvious regularity between the characteristic parameters extracted and the pressure fluctuation in the pipe.The experimental correlations based on A v S and A fp/S have the correlation coefficients up to 0.982 and 0.952,and the relative errors between the fitting value and the experimental value are 0.36%-1.68%and 1.05%-5.02%,respectively.
作者
关海荣
孙志强
GUAN Hairong;SUN Zhiqiang(School of Energy Science and Engineering,Central South University,Changsha 410083,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第3期719-725,共7页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51576213)
湖南省自然科学基金资助项目(2017JJ1031)~~
关键词
水力提升
垂直管
球形颗粒
压力波动
时频熵
hydraulic lifting
vertical pipe
spherical particles
pressure fluctuation
time-frequency entropy
