S0502-4-4 急加速する板の後流([S0502-4]噴流,後流および剥離流れ現象の解明と制御(4))

概要

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We studied on a vortex ring generated by a suddenly accelerated disk to understand a relation between the circulation and necessary force to accelerate the disk. To estimate a propulsive force of small swimming animals is our motivation. We measured velocity fields using a PIV system and high speed CMOS camera around a circular disk as a model of a fin and paddle. We showed that the time derivative of the circulation related to the force to drive the disk. Thus, the disk gives energy impulsively to the vortex ring. This gives us the way to estimate thrust if we could measure the change in circulation of the starting vortex ring by the disk. We applied it to the estimation of thrust by an accelerated non-circular disk by introducing an equivalent circle that has the same area as the non-circular disk.
一般社団法人日本機械学会の論文
2010-09-04