内窥式粒子成像测速系统(Endo-PIV)

采用LaVision公司特色的衍射光学内窥镜可以用于量产发动机缸内燃烧状态的成像可视化测量。可以用于PLIF，PIV，Soot等流体和燃烧产物的分布测量。

In the present work the effect of temperature on the hydrodynamic behavior of fluidized beds is experimentally studied with modern non-invasive experimental techniques. In particular, the development of a high temperature endoscopic Particle Image Velocimetry (PIV) is presented. An experimental set up has been designed and constructed that allows the study of hydrodynamics up to temperatures of 1000 oC, typical temperatures encountered in chemical looping gasification processes. First the endoscopic PIV results have been validated at low temperatures with a cold flow setup. Subsequently the application of the new technique to high temperature fluidized beds is presented and the obtained results discussed.

In this report we present the methodology we are using in the AMI group to compare optic flow estimation methods in the context of the FLUID Specific Targeted Research Project - Contract No 513633 founded by the CEE. The main goal of this report is to try to unify comparison criteria between the different parnerts in order to share information and conclusions. We think that it is one of the topics we have to address in Las Palmas Meeting December next. In order to describe the methodology we use, we divide it in five steps: 1. We choose a number of optic flow estimation methods 2. We choose an image sequence dataset to apply the methods. 3. We apply the methods and we store the results in a ASCII file using an standard format 4. We define a number of statistics to compare the methods (we use the ASCII files as basic information to compare). 5. We compute the statistics for each pair of methods and we generate tables with the information. To help result interpretation we use arrow images and in the case we know the optic flow groundtruth we generate image to provide the information about what method perform better in the different areas of the image. To illustrate this approach and to fit ideas we present the results of this approach in a particular image sequence provided by LaVision in sections from 1.1 to 1.4. Then, in section 2 we remark some of the difficulties we have found in our work, which should be discussed in order to be able to compare results provided by all the partners of the FLUID project.

内燃机、涡轮机或水泵的内流场PIV测量通常需要制造昂贵的带有大窗口以获得足够光通路的模型。在这些实验中，使用LaVision的内窥PIV系统具有极大的优势。只要8mm直径小孔的光学通道就可以满足PIV测量的需要，这给实验带来了极大的方便，并且大大降低了模型设计加工的成本和由此带来的麻烦。 LaVision的激光内窥镜将高能量脉冲激光点光源变为片光源， 它被设计安装在激光导光臂(多关节光臂) 的出口，在末端由一根细钢管完成壁面的内嵌。 图像的采集由经过特殊设计的相机内窥镜完成，这种内窥镜可以非常方便地取代镜头安装在 FlowMaster 系列的相机上。 适用领域： > 封闭区域内流场中的空气动力学现象研究 > 涡轮机，飞行器引擎，压缩机，水泵的研究 > 内燃机中的流动, 滚转和涡流研究 > 反应流场，工业反应器及燃烧研究 > 制药及医学应用研究

PIV systems rely on a combination of seed particles, laser light intensity, and camera positioning to collected velocity data. Careful attention is needed when selecting the ap- propriate setup conguration for PIV systems. This paper focuses on several areas for improvement in PIV data collection for a compressible turbulent boundary layer study on a at plate using MVG's. The topics include determining the seed particle surface preparation for a at plate, and PIV system conguration.