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Title: Cold-Flow Patterns and Mixing Index behind/near Rifled Bluff-Body Frustums
Authors: San, K. C;.Huang, Y. Z;.Yen, S. C.
Contributors: 國立台灣海洋大學:機械與機電工程學系
Date: 2013
Issue Date: 2016-03-23T07:49:24Z
Publisher: Journal of Visualization
Abstract: Rifled fillisters milled on cannular frustums were utilized to increase turbulence intensity (T.I.). Four configurations of unrifled, inner-rifled, outer-rifled, and two-faced rifled frustums were utilized to increase T.I. and mixing index (η). The mixing indices were calculated by measuring the concentrations of carbon dioxide (CCO2CCO2) and oxygen (CO2CO2) behind the pure-jet nozzle and bluff-body frustums. The riled helical fillisters intensify the interaction and mixing between central flow and annular-air flow. Flow characteristics behind the pure-jet nozzles and bluff-body frustums were analyzed by smoke-wire flow visualization, vortex-shedding anemometry, and gas analyzer. The smoke-streak flow patterns behind the pure-jet nozzle were characterized by jet-flow and vortex-shedding patterns. Three flow patterns of jet-flow, recirculation-flow, and turbulent-flow were characterized behind the bluff-body frustums. The experimental results showed that Strouhal number (St) increases with T.I., and high central-jet Reynolds number (Re c) induces a low St. The ηCO2ηCO2 increases with T.I. and the maximum ηCO2ηCO2of 64 % occurs behind the two-faced rifled frustum when T.I. = 4.5 %. The ηO2ηO2increases with T.I., and ηO2ηO2 has maximum of 98 % occurring behind the two-faced rifled frustum when T.I. = 3.5 %.
Appears in Collections:[Department of Mechanical and Mechatronic Engineering] Periodical Articles

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