抵抗低減を目的とした流れ方向進行波制御下の乱流境界層流れのLDV計測

抄録

Drag reduction effect of travelling wave control for turbulent boundary layer flow is measured by laser doppler velocimetry (LDV). Travelling waves are generated on a rubber sheet by oscillation of a piezoelectric actuator. Experiment apparatus is consist of 1.5 m of run up section and 1 m of testing section where the rubber sheet is installed. Experiment is carried out in the condition of mainstream velocity U_∞ = 3m/s, and momentum thickness-based Reynolds number Re_θ ~ 1500 at the center of the testing section. Friction drag coefficient C_f is calculated by integrated velocity distribution within 3% of uncertainty.