排灌机械工程学报
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排灌机械工程学报  2012, Vol. 30 Issue (1): 6-10    DOI: 10.3969/j.issn.1674-8530.2012.01.002
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离心泵内流场PIV测试中示踪粒子跟随性的计算
李亚林, 袁寿其, 汤跃, 袁建平
江苏大学流体机械工程技术研究中心, 江苏 镇江 212013
Analysis on tracing ability of PIV seeding particles in flow fields of centrifugal pumps
 LI  Ya-Lin,   Yuan-Shou-Qi,   Tang-Yue,   Yuan-Jian-Ping
Research Center of Fluid Machinery Engineering and Technology,Jiangsu University,Zhenjiang,Jiangsu 212013,China
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摘要 示踪粒子的选取依据不同的流场而不同,对于离心泵内流场合适的示踪粒子是保证PIV试验精度的关键.基于固液两相流理论,重点考虑黏性阻力和旋转因素对粒子的影响,对离心泵内部湍流场中的示踪粒子进行了受力分析.然后在BBO方程基础上引入外部势力,建立了离心泵内流场中示踪粒子的拉格朗日运动方程,并采用Fourier积分变换的数学方法首次推导出适应于离心泵内流场的PIV测试用示踪粒子跟随性计算公式.利用离心泵内流场的PIV测试结果采用相平均处理的方法计算了试验所用的示踪粒子的跟随程度,计算结果表明:粒子径向的跟随性比周向差,选择示踪粒子时优先考虑径向的跟随性;而由于离心泵叶轮旋转和曲率的影响,即使采用相平均处理,粒子的速度也不代表水流速度,粒子跟随性最大偏差度为4.55%.计算结果可以检验所用示踪粒子的可靠性,为离心泵内流场选取合适的示踪粒子提供理论依据.
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李亚林
袁寿其
汤跃
袁建平
关键词离心泵   示踪粒子   跟随性   粒子图像测速仪   流场     
Abstract: PIV seeding particles selection is flow fielddependent,so that the selecting suitable seeding particles to flow field in centrifugal pumps is the key thing to allow the accuracy of PIV measurement to be guaranteed.Based on the particleliquid twophase turbulent flow theory,the forces acting on the seeding particles,mainly including the viscous resistance and the forces caused from centrifugal acceleration field in a centrifugal pump were analyzed.Then the Lagrange equation of a seeding particle was established by introducing an external potential force into the BBO equation.Using the Fourier integral transform,a formula,which is applicable for PIV measurement of flow field in a centrifugal pump,for calculating the seeding particle tracing ability was deduced initially.Utilizing the PIV phaseaveraged measurement results of the flow field in a centrifugal pump,the seeding particle tracing ability was estimated.The results turned out the particle tracing ability in the radial direct is poorer than that in the circumferential one,thus the seeding particles should be selected according to the priority of tracing ability in the radial direction.Even though the results of PIV measurement are processed with a phaseaveraged technique,the velocity of seeding particles doesn′t represent the real velocity of fluid because of the effects of impeller rotation and streamline curvature,and causing a maximum error is as high as about  4.55%.The formula can be used to examine the reliability of seeding particles to improve the accuracy of PIV flow measurement in centrifugal pumps.  
Key wordscentrifugal pump   seeding particle   tracing ability   particle image velocimetry   flow field   
收稿日期: 2010-10-27; 出版日期: 2012-01-30
基金资助:

国家杰出青年科学基金资助项目;江苏省自然科学基金攀登项目

通讯作者: 李亚林(1984—),男,山东乳山人,博士研究生(yuanfangfriend@126.com),主要从事离心泵内部流场PIV试验研究.   
作者简介: 袁寿其(1963—),男,上海金山人,研究员,博士生导师(shouqiy@ujs.edu.cn),主要从事流体机械及排灌机械研究.
引用本文:   
李亚林, 袁寿其, 汤跃等. 离心泵内流场PIV测试中示踪粒子跟随性的计算[J]. 排灌机械工程学报, 2012, 30(1): 6-10.
LI Ya-Lin, Yuan-Shou-Qi, Tang-Yue et al. Analysis on tracing ability of PIV seeding particles in flow fields of centrifugal pumps[J]. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(1): 6-10.
 
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