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Investigation of interference effects of vortex structure on entrainment mechanism of twin circular free jets

涡结构对双圆形自由射流夹带机制的干涉效应研究

基本信息

批准号：
15560162
负责人：
FUJITA Shigetaka
金额：
$ 1.47万
依托单位：
Tokuyama College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560162/
关键词：
Twin Circular Jets Interference Nozzle Pitch Mean Velocity Field Turbulent Flow Field Secondary Flow Entrainment Vortex Structure

项目摘要

The aim is this study is to examine the three-dimensional structure of the free jets issuing from twin circular nozzles with three cases of nozzle pitch.In fiscal year 2003:1) Twin circular nozzles which suit the water tank facility for flow visualization were made from duralumin plates by milling. The values of nozzle spacing were 2, 4 and 8.2) Illuminating nylon particles by laser sheet light in the x-z plane, it was confirmed that there was no perturbation caused by reverse flow and the flow instability in the region between two circular jets.3) Using the result of preliminary experiments, the CCD camera and the PIV system were calibrated.4) Flow images in the x-z plane and the x-y plane were captured with a high speed camera (CCD camera), then the deformation of the vortex ring was observed using these images.In fiscal year 2004:1) Twin circular nozzles for the observation of vortex filaments were made from duralumin plates by milling. The values of nozzle spacing were 2, 4 and 8.2) Flow images in the x-z and x-y planes were captured with a CCD camera using laser sheet light, then the image files were saved on a personal computer.3) The deformation of the vortex filaments was observed using the images of flow visualization.4) The summary of a current result was reported at the international conference (The ERCOFTAC International Symposium on Engineering Turbulence Modeling and Measurements-ETMM6 -).

本文的目的是研究三种不同喷嘴螺距情况下双圆喷嘴自由射流的三维结构。2003财政年度：1)用硬铝板铣削制成双圆形喷嘴，适用于水箱设备的流动显示。喷管间距分别为2、4和8.2)激光片光在x-z平面上照射尼龙颗粒，证实了在两个圆形射流之间的区域不存在反向流动引起的扰动和流动不稳定性。3)根据初步实验结果，对CCD相机和PIV系统进行标定。4)利用高速相机（CCD相机）采集了x-z平面和x-y平面的流动图像，并利用这些图像观察了涡流环的变形。2004财政年度：1)用硬铝板铣削制成双圆形喷嘴，用于观察漩涡细丝。喷管间距分别为2、4和8.2)利用激光片光，用CCD相机捕捉x-z和x-y平面的流动图像，并将图像文件保存在个人计算机上。3)利用流动显示图像观察涡流丝的变形。4)在国际会议（ERCOFTAC工程湍流建模与测量国际研讨会- etmm6 -）上报告了当前结果的总结。