402 環状超音速噴流の流れ場の解明(2)(OS4-1 高速流れと衝撃波現象の解明と制御,OS4 高速流れと衝撃波現象の解明と制御,オーガナイズドセッション)

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タイトル別名
  • 402 Study on Fluid Field of Annular Supersonic Jet Flow(2)

説明

In this paper, it is clarified that the effect on annular supersonic jet by geometrical shape of annular nozzle which is applied in various fields in industry. An unsteady characteristics of annular supersonic jet issued from annular nozzle is given by the experiment. In particular, an effect of pressure vibration on flow filed is clarified. Moreover, the unsteady flow of the annular supersonic jet is calculated by the numerical analysis. And the effect on flow field by difference of nozzle exit shape and the static pressure in vortex region generated at nozzle exit are clarified. It was found that the nozzle shape and the stagnation pressure influenced the vortex region generated at nozzle exit, the separation point of flow and the pressure decrease in vortex region. When the annular nozzle is to be used as atomization nozzle, it is suggested that the pressure vibration of the nozzle exit and the static pressure of vortex region produce effects upon generation of metallic fine powder.

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