An experimental study of a round tube jet in a stationary environment and a cross-flow environment

碩士 === 國立臺灣科技大學 === 機械工程系 === 100 === The research studies the features of round tube jets in a stationary environment and the trajectory analysis of round tube jets in a cross-flow environment. The experiments were carried out in a vertical closed-loop water tunnel. Flow structures were observed by...

Full description

Bibliographic Details
Main Authors: Bo-chin Tsai, 蔡博欽
Other Authors: Yi-Jiun Peter Lin
Format: Others
Language:zh-TW
Published: 2012
Online Access:http://ndltd.ncl.edu.tw/handle/827w6q
id ndltd-TW-100NTUS5489145
record_format oai_dc
spelling ndltd-TW-100NTUS54891452019-05-15T20:51:11Z http://ndltd.ncl.edu.tw/handle/827w6q An experimental study of a round tube jet in a stationary environment and a cross-flow environment 圓柱管噴流在靜止及橫流環境下的實驗研究 Bo-chin Tsai 蔡博欽 碩士 國立臺灣科技大學 機械工程系 100 The research studies the features of round tube jets in a stationary environment and the trajectory analysis of round tube jets in a cross-flow environment. The experiments were carried out in a vertical closed-loop water tunnel. Flow structures were observed by using flow visualization and Particle Image Velocimetry(P.I.V.) techniques respectively. For round tube jets in a stationary environment, the characteristics of the flow rate and the maximum axial velocity are different for the round tube jets having different Reynolds numbers. Particle Image Velocimetry uses two interrogation cells to analyze captured images. A finer cell has results approaching to the theoretical model. Experimental results show that, the vortex ring formation changes the flow rate and the velocity field of the jet significantly. The velocity profile of the jet is closer to that of Schlichting theory after the vortex ring formation. For the trajectory analysis results of round tube jets in a cross-flow environment, three different trajectories determined by streamline, velocity and vorticity are notably different when the velocity ratio is less than 3 or larger than 9. This research uses streamline trajectory to analyze a round tube jet in a cross-flow environment. Experimental data are analyzed under two specific conditions of the same velocity ratio and the same cross-flow velocity. Experimental results show that Reynolds number is an important index for jet trajectory for these two conditions. When the Reynolds number of the jet is in the transition region, the trajectory of the jet shows some changes, especially the maximum axial distance which the jet can reach. When the Reynolds number is in the turbulent region, the jet trajectory is similar to those reported in the previous literature. Yi-Jiun Peter Lin 林怡均 2012 學位論文 ; thesis 145 zh-TW
collection NDLTD
language zh-TW
format Others
sources NDLTD
description 碩士 === 國立臺灣科技大學 === 機械工程系 === 100 === The research studies the features of round tube jets in a stationary environment and the trajectory analysis of round tube jets in a cross-flow environment. The experiments were carried out in a vertical closed-loop water tunnel. Flow structures were observed by using flow visualization and Particle Image Velocimetry(P.I.V.) techniques respectively. For round tube jets in a stationary environment, the characteristics of the flow rate and the maximum axial velocity are different for the round tube jets having different Reynolds numbers. Particle Image Velocimetry uses two interrogation cells to analyze captured images. A finer cell has results approaching to the theoretical model. Experimental results show that, the vortex ring formation changes the flow rate and the velocity field of the jet significantly. The velocity profile of the jet is closer to that of Schlichting theory after the vortex ring formation. For the trajectory analysis results of round tube jets in a cross-flow environment, three different trajectories determined by streamline, velocity and vorticity are notably different when the velocity ratio is less than 3 or larger than 9. This research uses streamline trajectory to analyze a round tube jet in a cross-flow environment. Experimental data are analyzed under two specific conditions of the same velocity ratio and the same cross-flow velocity. Experimental results show that Reynolds number is an important index for jet trajectory for these two conditions. When the Reynolds number of the jet is in the transition region, the trajectory of the jet shows some changes, especially the maximum axial distance which the jet can reach. When the Reynolds number is in the turbulent region, the jet trajectory is similar to those reported in the previous literature.
author2 Yi-Jiun Peter Lin
author_facet Yi-Jiun Peter Lin
Bo-chin Tsai
蔡博欽
author Bo-chin Tsai
蔡博欽
spellingShingle Bo-chin Tsai
蔡博欽
An experimental study of a round tube jet in a stationary environment and a cross-flow environment
author_sort Bo-chin Tsai
title An experimental study of a round tube jet in a stationary environment and a cross-flow environment
title_short An experimental study of a round tube jet in a stationary environment and a cross-flow environment
title_full An experimental study of a round tube jet in a stationary environment and a cross-flow environment
title_fullStr An experimental study of a round tube jet in a stationary environment and a cross-flow environment
title_full_unstemmed An experimental study of a round tube jet in a stationary environment and a cross-flow environment
title_sort experimental study of a round tube jet in a stationary environment and a cross-flow environment
publishDate 2012
url http://ndltd.ncl.edu.tw/handle/827w6q
work_keys_str_mv AT bochintsai anexperimentalstudyofaroundtubejetinastationaryenvironmentandacrossflowenvironment
AT càibóqīn anexperimentalstudyofaroundtubejetinastationaryenvironmentandacrossflowenvironment
AT bochintsai yuánzhùguǎnpēnliúzàijìngzhǐjíhéngliúhuánjìngxiàdeshíyànyánjiū
AT càibóqīn yuánzhùguǎnpēnliúzàijìngzhǐjíhéngliúhuánjìngxiàdeshíyànyánjiū
AT bochintsai experimentalstudyofaroundtubejetinastationaryenvironmentandacrossflowenvironment
AT càibóqīn experimentalstudyofaroundtubejetinastationaryenvironmentandacrossflowenvironment
_version_ 1719104753044029440