S054041 自励振動する長方形噴流の流動特性([S054-04]噴流、後流およびはく離流れ現象の探求と技術革新(4))

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タイトル別名
  • S054041 Characteristics of Self-Excited Oscillating Jet from a Rectangular Nozzle

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Turbulent jets are utilized in various industrial devices such as combustors and ejectors. To control jets and enhance mixing, several devices have been developed, and mixing process also has been studied. For the practical applications, such devices should be simple, reasonable and durable. Oscillating jets are effective to enhance mixing. In this study, a flapping jet is focused for mixing passively. The flapping jet is a self-excited flow which emerges from a fluidic device. The fluidic device consists of a slit nozzle with a rectangular chamber. From the flow visualization, it is found that the jet flaps inside a chamber accompanying with reverse flows from the outside of the chamber, and it becomes a periodical large-scale motion outside the chamber, the configuration of the nozzle and the chamber for the stable oscillation is also found. From the measurement of mean velocity profiles, the flapping jet is found to have a large spreading angle and shows remarkable decay rate of mean velocity. In addition, it is noticed that the frequency of the flapping jet varies depending on the chamber size.

収録刊行物

  • 年次大会

    年次大会 2013 (0), _S054041-1-_S054041-5, 2013

    一般社団法人 日本機械学会

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