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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/37573

Title: Cold-Flow Patterns behind Novel Rifled Bluff-Body Cones
Authors: San, K. C., Shih, C. L., and Yen, S. C
Contributors: 國立臺灣海洋大學:機械與機電工學系
Date: 2014
Issue Date: 2016-03-22T03:42:30Z
Publisher: Journal of Mechanical Science and Technology
Abstract: Flow momentum behind a conventional nozzle is modulated by four different bluff-body cones — non-rifled, 1-rifled, 2-rifled and 3-rifled cones. This novel rifled-cone swirl generator (RCSG) includes the blockage disc and rifled bluff-body cones. The rifled bluff-body cone transforms the axial momentum (or the axial velocity) into the angular momentum (or the tangential velocity). The swirling flow is enhanced by increasing the tangential velocity of central jet. In this investigation, the carbon-dioxide (CO2) is utilized as the index gas to determine the mixing index of RCSGs. Namely, the mixing index between the central CO2-jet and the annular air-jet is increased using the RCSGs. The cold-flow patterns behind the rifled bluff-body cones are visualized using the smoke-wire scheme. The cold-flow patterns are categorized as — jet-flow, single-bubble and dual-bubble modes. The jet-flow mode occurs at low u a . Additionally, the jet-flow and single-bubble modes are further classified as — Type-I and type-II sub-modes. The particle-image velocimetry (PIV) measures the cold-flow velocity vectors. The mixing levels of CO2 in the cold-flow modes are detected using a gas concentration analyzer.
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/37573
Appears in Collections:[機械與機電工程學系] 期刊論文

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