A132 オルガンパイプにおける流体渦と音響渦

概要

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A pictorial analysis of vortex generation in organ pipes is presented on the basis of the results visualizing the smoked-jet motion during the attack transient with a high-speed digital video camera. Various types of vortices are formed according to the process of jet-edge interaction. These vortices are hydrodynamic ones generated by dissipating the energy of jet flow during the first phase of tonal buildup. On the other hand, another type of the vortex, whose direction of rotation is opposite to the hydrodynamic one, begins shedding from the edge surface at the pre-steady state just prior to steady sound production. This vortex shedding, however, disappears at the steady state. It may be generated by absorbing an excess energy of the growing acoustic particle velocity around the edge, and called the acoustically-induced (or simply, acoustic) vortex.
日本流体力学会の論文
2000-07-25