S0502-2-1 マルチシンセティックジェットの干渉過程と三次元渦構造に及ぼすジェット孔ピッチの影響([S0502-2]噴流,後流および剥離流れ現象の解明と制御(2))

Abstract

A synthetic jet is a promising technique to promote the mixing and to control flow separation because of the periodic flow disturbance. When the synthetic jet array is applied to the flow control in the fluid machinery, it is necessary to consider the optimal configuration of the jet devices. In this study, the phase-averaged three-dimensional flow structures of the two synthetic jets with in-line and parallel configurations injected in cross flow were measured by scanning stereoscopic PIV. The two jets can be actuated independently at the different injection phase and the jet spacing. The phase difference is set to ensure the coincidence of the tip location of the front and rear jets. In in-line configuration, the volume averaged vorticity of longitudinal vortex is increased by rear jet which is interacted at the position where the vortex of the front jet is fully developed. In parallel configuration with the spacing less than 12D, the momentum transport to the wall is not affected compared to wide spacing case, although the vorticity of longitudinal vortex decays by interaction with adjacent vortex.