D334 加熱された旋回流がつくる軸方向流れ

概要

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The vortex bursting, the phenomena that flame propagates rapidly in a vortex tube, attracts attention in turbulent combustion study and has been studied in numerical and experimental methods. In our previous study, we revealed that azimuthal vorticity plays important role for flame propagation and extinction in vortex bursting. It is useful to understand the basic property of azimuthal vorticity and axial flow induced by heating apart of swirl flow. The total energy of heating is kept and heating period and the ratio of initial azimuthal velocity to lamina flame propagation speed are changed. The time development of maximum azimuthal vorticity is divided into two stages. In first stage, azimuthal vorticity is affected by pressure wave through the dilatation term of vorticity equation, creating a peak. In the second stage, azimuthal vorticity propagates almost at constant dimensionless speed in all conditions. The axial flow and strain rate field induced by azimuthal vorticity takes similar form to that of a single vortex ring and the dispersion of axial velocity distribution gets smaller as the value of β increasing.
日本流体力学会の論文
2001-07-31