全体安定性解析による円形噴流の崩壊過程の解析(流体工学,流体機械)

概要

論文の詳細を見る
In order to investigate the diversity of the development of near-field of a round jet found in experiments and in numerical simulations by different authors, we applied a global instability analysis to a secondary instability of the near-field region of a round jet. The secondary instability takes place in a braid region between neighbouring vortex rings after the primary instability generating vortex rings, and streamwise vortices due to the secondary instability is a key issue in a decay process of a spatially developing jet. They consist of various modes with a non-uniform concentration in the azimuthal direction in a spatially devoloping jet. The analysis demonstrates that the small difference in receptivity of each unstable mode causes locally different speed of the growth of disturbances. This non-uniform receptivity in the secondary instability causes diverse process of decay of vortex rings in spatially developing jets.
社団法人日本機械学会の論文
2002-01-25