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http://dx.doi.org/10.5762/KAIS.2019.20.1.470

Numerical Study on the Super Sonic Phenomenon of Compressed Air according to the Flow Path Conditions  

Kim, Seung Mo (School of Mechanical Engineering, Korea University of Technology and Education)
Kim, Moosun (Urban Transit Research Team, Korea Railroad Research Institute)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.20, no.1, 2019 , pp. 470-476 More about this Journal
Abstract
The braking force for a train is generally provided by compressed air. The pressure valve system that is used to apply appropriate braking forces to trains has a complex flow circuit. It is possible to make a channel shape that can increase the flow efficiency by 3D printing. There are restrictions on the flow shape design when using general machining. Therefore, in this study, the compressed air flow was analyzed in a pressure valve system by comparing flow paths made with conventional manufacturing methods and 3D printing. An analysis was done to examine the curvature magnitude of the flow path, the diameter of the flow path, the magnitude of the inlet and reservoir pressure, and the initial temperature of the compressed air when the flow direction changes. The minimization of pressure loss and the uniformity of the flow characteristics influenced the braking efficiency. The curvilinear flow path made through 3D printing was advantageous for improving the braking efficiency compared to the rectangular shape manufactured by general machining.
Keywords
3D printing; Brake valve system; Flow path; Numerical analysis; Pressure loss;
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Times Cited By KSCI : 2  (Citation Analysis)
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