1904 低密度気体噴流に生じるサイドジェットの出現条件(S21-1 噴流,後流及びはく離流れの流動解析と応用(1),21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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A natural development process of a low-density jet, such as a helium gas, is different from that of a constant-density jet. Side jets, which are radial ejections, are formed at vicinity of the nozzle exit and mixing of fluids between the jet and the ambient is enhanced. Main parameter to distinguish formation of the side jet is density ratio of jet fluid to ambient fluids. The other parameters are the Reynolds number and the shear layer thickness at the nozzle exit. Helium gas, helium-air mixture, and air are discharged from a round nozzle upward and visualized by planar laser Mie scattering (PLMS). The region for formation of the side jets in the density ratio-Reynolds number plane is illustrated. The velocity profile at the nozzle exit is measured by a hot-wire concentration probe and a hot-wire probe, and the momentum thickness at the exit is given. The region of the side jets in the density ratio-momentum thickness domain is shown.
一般社団法人日本機械学会の論文
2008-08-02