逆坡倾角对管道水流粗颗粒输送脉动压强影响试验研究  

Experimental Research on the Influence of Adverse Slope Angle on the Fluctuating Pressure of Coarse Particle Transportation in Pipeline Flow

作　　者：谭伟强 来志强 王仲梅[2,3,4] 赵连军 张世宝[1] TAN Wei-qiang;LAI Zhi-qiang;WANG Zhong-mei;ZHAO Lian-jun;ZHANG Shi-bao(North China University of Water Resources and Electric Power,Zhengzhou 450045,Henan Province,China;Yellow River Institute of Hydraulic Research,Zhengzhou 450003,Henan Province,China;Key Laboratory of lower Yellow River Channel and Estuary Regulation,Ministry of Water Resources,Zhengzhou 450003,Henan Province,China;Henan Key Laboratory of Ecological Environment Protection and Restoration in the Yellow River Basin,Zhengzhou 450003,Henan Province,China)

机构地区：[1]华北水利水电大学水利学院,河南郑州450045 [2]黄河水利委员会黄河水利科学研究院,河南郑州450003 [3]水利部黄河下游河道与河口治理重点实验室,河南郑州450003 [4]河南省黄河流域生态环境保护与修复重点实验室,河南郑州450003

出　　处：《中国农村水利水电》2023年第2期114-120,127,共8页China Rural Water and Hydropower

基　　金：国家自然科学基金项目(51909102,U2243219);河南省重大公益专项(201300311600);中央级公益性科研院所基本科研业务费专项项目(HKY-JBYW-2021-01);黄河水利科学研究院推广转化基金项目(HKY-YF-2022-03)。

摘　　要：管道输送时水流压强的脉动特性反映了管流紊动程度与紊动能量,对管道输送安全及稳定运行影响显著。本研究以管道清水粗颗粒输送为研究背景,通过自行设计的物理模型试验装置,模拟了不同管道逆坡倾角条件下粗颗粒泥沙的水力输送过程,分析了不同逆坡倾角条件下管壁瞬时压强、时均压强、脉动压强振幅分布和频谱特性。试验结果表明,当管道逆坡倾角增大时,脉动压强的时均压强和瞬时峰值压强随倾斜角度的增大而减小;脉动峰值压强总趋势随倾斜角度的增大而增大;脉动压强的振幅分布符合高斯分布,随倾斜角度的增加,脉动压强的振幅逐渐增加。其概率密度函数形态从“高瘦”逐渐向“矮胖”发展;脉动压强的功率谱谱函数的优势频率主要集中在25 Hz的主频范围,随管道的倾斜角度增加,脉动压强的优势频率逐渐向较大频率的发展,总体变化较小。The fluctuating characteristics of flow pressure during pipeline transportation reflect the degree and energy of turbulence in pipe flow, fluctuation pressure has a significant impact on the safety and stable operation of pipeline transportation. In this study, the research team self-designed a physical model test device based on the research background of pipeline clean water coarse particle transportation. The hydraulic transport process of coarse sediment under different adverse slope angles of the pipeline is simulated by model experimental device.The fluctuation change of solid-liquid two-phase flow in pipeline transportation is obtained by analyzing the distribution diagram of instantaneous pressure and fluctuating pressure in the pipeline at different angles. The research team analyzes the change rules of the instantaneous pressure, time average pressure, amplitude distribution of fluctuating pressure and frequency spectrum characteristics of the pipe wall under different adverse slope angles. The experimental results of the physical experiment model device show that the fluctuation of solid-liquid two-phase flow in pipeline transportation increases significantly with the increase in the adverse slope angle of the pipeline, and the variance distribution diagram of the fluctuating pressure intuitively shows the trend of the fluctuating pressure volatility. When the inclination angle of the pipeline is increased, the time average pressure and instantaneous peak pressure of fluctuating pressure decrease with the increase in the inclination angle. With the increase in the inclination angle, the general trend of fluctuating peak pressure on the pipe wall increases gradually;the amplitude distribution law of fluctuating pressure conforms to the Gaussian distribution, and it is universally acknowledged that the Gaussian distribution function can be used to fit the amplitude distribution of fluctuating pressure. With the increase in the tilt angle, the amplitude of fluctuating pressure increases gradually relative

关 键 词：管道水力输送 固液两相流 逆坡倾角 脉动压强 粗颗粒 

分 类 号：TV134.1[水利工程—水力学及河流动力学]