1402 二次元噴流中に存在する渦構造の変形(遠心力不安定に関する考察)

概要

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Three dimensional deformation and pairing process of vortex tubes were investigated in a two-dimensional parabolic jet exhausted from a nozzle of 10mm×400mm. Hot-wire measurement and multi-smokewire visualization were compared. Vortex pairing occurred periodically around X/2h≒7 when the bimodal excitation conducted at u_s/u_f=1,Φ=0 deg, where u_f and u_s were fundamental and subharmonic components, respectively, and Φ was the phase deference between u_f and u_s. Vortex arrangement shifted into anti-symmetric one after the pairing. At Φ=120°, the vortex pairing became to occur occasionally. When two vortices didn't paired, the symmetric arrangement was kept until far downstream. Rib structures elongated from the roll vortices were important role as the interaction between the roll vortices.
社団法人日本機械学会の論文
2003-08-05