Numerical study in flow uniformity of diffusers
碩士 === 中原大學 === 機械工程研究所 === 106 === Diffuser is widely used in industry and the flow behavior within is commonly investigated. For example, the bolts can be pre-coated with some adhesive plastics to increase the clamping force and reduce the occurrence of loosen and falling fasteners. During the coa...
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ndltd-TW-106CYCU54890142019-05-16T00:15:32Z http://ndltd.ncl.edu.tw/handle/f9x67e Numerical study in flow uniformity of diffusers 漸擴管流場均勻性之數值研究 Yun-Kai Tang 湯允凱 碩士 中原大學 機械工程研究所 106 Diffuser is widely used in industry and the flow behavior within is commonly investigated. For example, the bolts can be pre-coated with some adhesive plastics to increase the clamping force and reduce the occurrence of loosen and falling fasteners. During the coating process, the air-particle mixtures are ejected from the coating diffuser toward the preheated bolts. However, an accumulation of particles is encountered near the outlet of the coating nozzle, which reduces the uniformity of particle distribution on the bolt surface. This phenomena has been proven to reduce the expected clamping force by experiments. Therefore, this thesis would find out the strategy to avoid the accumulation of particles and improve the uniformity of the diffuser by using computational fluid dynamic (CFD) simulation. Influence of the angle and the length of diffuser, the Reynolds number, the baffles and the mixing zone on the flow behaviors are systematically investigated. In general, the flow structure within the diffuser can be categorized into four types accordingly and the critical parameters are fully detected. The accumulation of particles can be prevented as the secondary flow near the outlet is absent, and the ‘unstall’ type is found to have better uniformity. Chuan-Chieh Liao 廖川傑 2018 學位論文 ; thesis 62 zh-TW |
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碩士 === 中原大學 === 機械工程研究所 === 106 === Diffuser is widely used in industry and the flow behavior within is commonly investigated. For example, the bolts can be pre-coated with some adhesive plastics to increase the clamping force and reduce the occurrence of loosen and falling fasteners. During the coating process, the air-particle mixtures are ejected from the coating diffuser toward the preheated bolts. However, an accumulation of particles is encountered near the outlet of the coating nozzle, which reduces the uniformity of particle distribution on the bolt surface. This phenomena has been proven to reduce the expected clamping force by experiments.
Therefore, this thesis would find out the strategy to avoid the accumulation of particles and improve the uniformity of the diffuser by using computational fluid dynamic (CFD) simulation. Influence of the angle and the length of diffuser, the Reynolds number, the baffles and the mixing zone on the flow behaviors are systematically investigated. In general, the flow structure within the diffuser can be categorized into four types accordingly and the critical parameters are fully detected. The accumulation of particles can be prevented as the secondary flow near the outlet is absent, and the ‘unstall’ type is found to have better uniformity.
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author2 |
Chuan-Chieh Liao |
author_facet |
Chuan-Chieh Liao Yun-Kai Tang 湯允凱 |
author |
Yun-Kai Tang 湯允凱 |
spellingShingle |
Yun-Kai Tang 湯允凱 Numerical study in flow uniformity of diffusers |
author_sort |
Yun-Kai Tang |
title |
Numerical study in flow uniformity of diffusers |
title_short |
Numerical study in flow uniformity of diffusers |
title_full |
Numerical study in flow uniformity of diffusers |
title_fullStr |
Numerical study in flow uniformity of diffusers |
title_full_unstemmed |
Numerical study in flow uniformity of diffusers |
title_sort |
numerical study in flow uniformity of diffusers |
publishDate |
2018 |
url |
http://ndltd.ncl.edu.tw/handle/f9x67e |
work_keys_str_mv |
AT yunkaitang numericalstudyinflowuniformityofdiffusers AT tāngyǔnkǎi numericalstudyinflowuniformityofdiffusers AT yunkaitang jiànkuòguǎnliúchǎngjūnyúnxìngzhīshùzhíyánjiū AT tāngyǔnkǎi jiànkuòguǎnliúchǎngjūnyúnxìngzhīshùzhíyánjiū |
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1719162849027162112 |