主流中における間欠噴流の特性 : はく離制御デバイスの基礎研究(<小特集>乱流せん断流の制御)

概要

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Some properties of a pulsating round jet issuing into a uniform cross flow are studied experimentally with the aim of developing a device for active control flow separation. The jet is produced by a zero-mass-flow actuator which is a round orifice connected to a speaker driven by a periodic square-wave train. The jet consists of a train of vortex rings, whose pattern can be classified into three types, depending on the circulation of the vortex ring. The trajectory of the pulsating jet is found to collapse into a single curve if it is normalized by the frequency of the square wave, the velocity amplitude at the exit of the orifice, and the cross-flow velocity. The effect of the suction phase of the zero-mass-flow actuator vanishes within one diameter from the orifice.
社団法人日本機械学会の論文
1997-01-25