2503 平面噴流の流れ特性に及ぼす音波周波数の影響(G05-1 噴流(1),G05 流体工学)  [in Japanese] 2503 Influence of Sound Wave Frequency on Plane Jet Characteristics  [in Japanese]

This paper describes that an experimental study is performed to reveal the effects of an acoustic forcing frequency on flow characteristics in a plane jet. Active control of a planar jet has been attempt using a sinusoidal excitation blowing and sucking at the nozzle exit. The turbulent intensity of excitation is set at 2% of the jet velocity and the frequency of excitation is changed from 100 to 600Hz. The hot-wire measurements directly provide phase averaged flow fields and they illustrate appearance of the jet. Moreover, flow visualization was conducted to grasp the jet spread rate easily. The spread rate is taken as a function of the excitation frequency. For 100Hz excitation, the jet spread most rapidly.