纤维悬浮液在离心泵中的流动及减阻特性  

FLOW CHARACTERISTICS OF DRAG-REDUCING FIBER SUSPENSIONS IN A CENTRIFUGAL PUMP

作　　者：张启华[1] 康顺 谢之昂 张为栋 闫召旭 匡世波 ZHANG Qihua;KANG Shun;XIE Zhi'ang;ZHANG Weidong;YAN Zhaoxu;KUANG Shibo(National Research Center of Pumps,Jiangsu University,Zhenjiang 212000,Jiangsu,China;Department of Chemical Engineering,Monash University,Melbourne 3800,Australia)

机构地区：[1]江苏大学流体机械工程技术研究中心,江苏镇江212000 [2]莫纳什大学工程学院,澳大利亚墨尔本3800

出　　处：《力学与实践》2021年第3期335-342,共8页Mechanics in Engineering

基　　金：国家自然科学基金(51309118);江苏省自然科学基金(20130527);江苏省“六大人才高峰”项目资助。

摘　　要：在进行开式叶轮离心泵(额定转速n=1450 r/min,流量Q=26.8 m^(3)/h)的性能测试时,发现纤维悬浮液的存在使泵产生减阻特性。采用粒子图像测速法对叶轮流道进行拍摄,研究纤维粒子对流场的影响。结果发现,在质量浓度0.1%0.2%范围,流量0.4Q1.4Q范围,随着纤维浓度的增加,悬浮液的流动损失随之减小。通过高速摄影拍摄纤维粒子分布,发现流量较低时,纤维取向主要沿着圆周方向。而在额定流量和较大流量下,纤维取向倾向于随机分布。随着纤维浓度增加,流道内纤维之间的相互作用进一步增加,有利于减少流动损失。随机分布时的减阻效果明显高于圆周分布,随机分布导致相对速度更大的提升是主要原因。在整个实验过程中,没有产生纤维粒子导致的沉淀和堵塞现象。The drag reducing feature is observed in the performance measurement of the suspension pumping with fibers by an open-impeller centrifugal pump(with the rated rotating speed n=1450 r/min,the flow rate Q=26.8 m^(3)/h).The flow characteristics are investigated by the particle image velocity to examine the effect of the fiber particle on the flow field.It is found that,for the mass concentration of 0.1%0.2%at the flow rate of 0.4 Q 1.4 Q,the flow loss caused by the fiber suspension decreases with the increasing concentration.The particle distribution is investigated by the high-speed photography.At a lower flow rate,the fiber is mainly orientated toward the circumferential direction.At the rated flow rate and a larger flow rate,the fiber orientation becomes randomly distributed.The flow passage is occupied by the fabricate fiber structure as the fiber-fiber interaction increases with the concentration,which may be beneficial for reducing the flow loss.The effect of the drag-reducing in a random distribution case is more significant than that in the circumferential distribution,which may be due to the greater rise of the relative velocity level in the random case.But no sediment of fiber flocs and clogs occur during the full operational range.

关 键 词：离心泵 减阻 纤细纤维 试验 流场分析 

分 类 号：TH311[机械工程—机械制造及自动化]