A25-127 A STUDY ON A FLUIDIC OSCILLATOR AT LOW REYNOLDS NUMBERS

概要

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A confined jet sometimes causes self-exited oscillations due to an existence of a downstream obstacle. In this work, the authors study this phenomenon at low Reynolds number (Re∿10^2). More specifically, the authors deal with a two-dimensional confined jet into an abruptly expanding channel with a downstream square-cylinder target, experimentally and numerically. Experimentally, the authors conducted the velocity measurements by UVP (Ultrasonic Velocity Profiler). As a result, the authors specified the cylinder-distance effect, the cylinder-size effect, and the channel-beneath effect upon both the Strouhal number and oscillation range. In addition, the authors revealed the Reynolds number effect/limit on the Strouhal number and oscillation range. Moreover, the flow patterns in the fluidic oscillator were measured by PIV (Particle Image Verocimatry). Numerically, analysis was performed using a finite difference method (FDM). As a result, it is confirmed that computed Strouhal number show good agreement with experimental one. Therefore this is intrinsically two-dimensional phenomenon.
社団法人日本機械学会の論文
2003-11-30