1) Cohn fractions PIV-1 and PIV-4
Cohn组份(PIV-1,PIV-4)
2) Particle Image Velocimetry
PIV
1.
Technology of particle image velocimetry test in automotive wind tunnel
汽车风洞的PIV试验技术
2.
Particle images in various flow fields of annulus helical flow were screened with PIV(Particle Image Velocimetry) technology.
利用PIV(粒子图像测速仪)系统拍摄各种情况下环空螺旋流场中粒子的图像,对数据进行分析处理。
3.
A vertical test rig for the atomization study of coal-water paste has been set up and a method proposed for measuring the particle average diameter and distribution of water coal paste atomized particles with the use of a PIV (particle image velocimetry) technique and a newly developed image processing software.
建立了一套垂直式水煤膏雾化试验装置 ,提出了通过采用PIV技术及二次开发的图像处理软件来测量水煤膏雾化颗粒的平均粒径与分布的方法 ,分析了水煤膏雾化颗粒测量的影响因素 ,为进一步研究水煤膏喷嘴雾化性能提供了保
4) PIV
PIV测量
1.
Measurement of Spherical Ceramic Particles Motion in a Vertical Duct by PIV;
竖直管内陶瓷球颗粒运动的PIV测量
5) PIV technology
PIV技术
1.
Determination of power-law flow field in annulus line with PIV technology;
应用PIV技术测量幂律流体在环空管道内的流场
2.
Then the equipments of the PIV system,tank used in the test and floe models are mentioned,velocity of flow in the ice free flow field is calibrated,and applications of PIV technology in measuring floe field under floe ice with different shadings and sizes are carried out.
本文先介绍PIV技术的试验原理,为它应用于冰下流场的测试提供理论依据,然后介绍PIV系统仪器设备、试验所用水槽和冰模型情况,并且对无冰流场进行流速标定,最后应用PIV技术对处于不同底纹和尺寸浮冰下流场和尾流进行测试研究。
3.
In this paper, author measured various regions of the flow field in UFHS in virtue of advanced PIV technology, analysed single-phase circulating water character parameters at a rate of flow such as the distribution of vorticity field, turbulence intensity, Reynolds stresses, and one section of the distribution of speed; measure
本文借助先进的PIV技术对上升流水力分选机各个区域的流场流态进行测量试验,分析单相循环水在上升流中的运动规律如涡量场、湍流度、雷诺应力、某一截面速度分布等参数;对颗粒在上升水流中的运动和分层规律进行试验与分析,并对颗粒相与液相速度进行比较分析;研究上升水流速对颗粒分离的作用。
6) PIV technique
PIV技术
1.
The velocity maps and vorticity maps of the different side in 2-dimension flow field were also obtained by PIV technique,while the varing rules of streamline and vorticity were found by further analyzing the .
利用PIV技术测量长方形水槽模型中磁力搅拌器产生的搅拌流场,得到了不同断面的二维流场内的速度分布和涡量分布,通过对实验数据的分析研究,进一步得到水槽内流线和涡量的变化规律。
2.
In order to improve the flow con-ditions in the equipment, three typical kinds of flow regulating components have been studiedin this work with the PIV technique.
针对入口构件后设备主分离区流场中存在严重的一次涡流和二流涡流现象,首次在重力式油水分离设备中引入整流构件的概念,并对提出的数种典型整流构件,按其对设备主分离区流场的影响,应用PIV技术进行了系统的模拟实验优选研究。
补充资料:Cohn-Vossen变换
Cohn-Vossen变换
Cohn - Vossen transformation
C曲n一V哈即.变换【C曲n一V侣sentr即昭如而.垃.;k加.-伽鱿。时.即以枷~] 一对等距曲面F.和凡与所谓的中间曲面凡的无穷小形变之间的一种对应:如果义,和x:是曲面名和凡的径(位置)向量,那么耳的径向量x,由(x.+从)/2给出,无穷小形变Z的速度场:是(x一丸)厂2.它是由S.ECohn一v浇sen(川)弓队的.如果巩和凡是光滑曲面,并且F:和凡上在等距下互相对应的曲线的半切线T、和几之间的角小于兀,那么知道凡是光滑的.这个事实,已经使得在许多情形下,能够将对F,和凡的等距的研究,化成对凡的无穷小形变(infinitesimal deforma-tion)的研究.对F,上固定点M,和凡上固定点从,Co腼一V加sen变换定义了正交矩阵O到描述凡无穷小形变的斜对称矩阵的一个Cayley变换,其中O表示从式的切空间到凡的切空间的等距. Cohn一V咙sen变换能推广到常曲率空间的情形(〔2」).【补注】对这种类型的无穷小形变也使用无穷小弯曲(infinitesimal bending)这个术语.中间曲面是空间中将连接F,和凡上对应点(在等距之下)的线段分成比为又:以一l)的点所定义的等距曲面汽和凡的配比曲率(mixture of isometric surfaces)在又一l/2时的特殊情形.对这些配比曲面的研究是凸曲面同痕问题(150-topy pyoblem of convex surfaces)中的一个重要工具视凸曲面(convex surface)和[2』,第3章第3段).
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