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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/45842

Title: Design of a Porous Bluff-Body Disc on Improving the Gas-Mixing Efficiency
Authors: Shun-Chang Yen;You-Lun Peng;Kuo-Ching San
Contributors: 國立臺灣海洋大學:機械與機電工程學系
Date: 2017
Issue Date: 2018-04-12T07:45:28Z
Publisher: Proceedings of the World Congress on Engineering 2017
Abstract: Abstract:A bluff body with multiple holes was designed to
transform the axial momentum into radial and tangential
momentum for increasing the swirl number (S). A numerical
study of bluff-body structure with multiple holes was
performed using ANSYS Fluent computational fluid dynamics
(CFD) analysis. The effects of hole number and jet inclination
angles were considered using a fixed gas flow rate and a
non-reactive gas. The concentration distribution behind the
mixing of central carbon-dioxide (CO2) jet and annular air jet
was utilized to analyze the mixing efficiency. Three bluff bodies
with differing hole numbers (H = 3, 6, and 12), three different
jet inclination angles (θ = 30°, 45°, and 90°) were designed for
the analysis. The Reynolds normal stress increases with the
inclination angle. The Reynolds shear stress, averaged turbulence
intensity and a/veraged swirl number decrease with the inclination
angle. For the unsymmetrical hole configuration (i.e., H = 3), the
streamline patterns shows a unsymmetrical flow field. The
highest mixing efficiency (i.e., the lowest integral gas fraction of
CO2) occurs at H = 3. Furthermore, the highest swirl number
coincident the strongest effect on the mass fraction of CO2. The
unsymmetrical hole arrangement induces a high swirled flow
behind the porous disk.
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/45842
Appears in Collections:[機械與機電工程學系] 演講及研討會

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