摘要
泥浆在管道输送中阻力大导致能耗高,严重制约疏浚生产效益。本文将泥沙流变学的振动加载流化技术应用到泥浆管道输送减阻研究中,在管道系统中开展振动流变减阻效果研究。结果表明,减阻效果随着振动频率的增大先显著提升后趋于平缓;随着体积浓度的增加而增强,但其增强的速度逐渐减小;随着输送流速的增加而不断减弱直至趋于平稳。且对于试验泥样,存在一个最优振动频率为40 Hz,此时系统达到了最佳减阻效益状态;在内径为100 mm管道中,当泥浆体积浓度为29.94%、管道输送流速为0.9 m/s、微幅机械振动频率为100 Hz时,对于中值粒径为31μm的奉贤海滩泥沙能减小20%以上的阻力损失;最后,提出了泥浆管道输送振动流变减阻的计算模型。
The mud has high resistance in pipeline transportation,which results in high energy consumption and thus severely restricts the efficiency of dredging production.This paper applies the vibration loading fluidization technology of sediment rheology to the research on the drag reduction of mud pipeline transportation and investigates the effect of vibration rheology on drag reduction in the pipeline system.The results show that the drag reduction effect increases significantly and then tends to be stable with the increase in the vibration frequency and is enhanced with the increase in the volume concentration but at a gradually decreased rate.The increase in the conveying flow rate weakens the drag reduction effect until making it level off.For the mud sample tested in this paper,there is an optimal vibration frequency,40 Hz,at which the system has reached the best state of drag reduction benefits.In a pipeline with an inner diameter of 100 mm,the resistance loss can be reduced by more than 20% for sediment at the Fengxian Beach with a median particle size of 31 μm when the mud volume concentration is 29.94%,the pipeline transportation velocity 0.9 m/s and the micro-amplitude mechanical vibration frequency 100 Hz.Finally,this paper proposes the calculation model for the drag reduction of the mud pipeline transportation by vibration rheology.
作者
陈杨柳二
郝宇驰
陶润礼
张民曦
喻国良
CHEN Yang-liu-er;HAO Yu-chi;TAO Run-li;ZHANG Min-xi;YU Guo-liang(School of Naval Architecture,Ocean&Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;CCCC National Engineering Research Center of Dredging Technology and Equipment Co.,Ltd.,Shanghai 201208,China)
出处
《水运工程》
北大核心
2022年第6期29-34,共6页
Port & Waterway Engineering
基金
国家自然科学基金项目(52001206)。
关键词
疏浚泥浆
管道输送
振动减阻
泥沙流变
阻力损失
微幅机械振动
dredging mud
pipeline transportation
drag reduction by vibration
sediment rheology
resistance loss
micro-amplitude mechanical vibration
