Active Drag Reduction Using Selective Low Rate Suction

摘要: The objective of this study is to determine the effectiveness using an active sensor/suction technique identify and remove low-speed streaks from a turbulent boundary layer in order reduce skin friction. An experimental investigation was conducted both water wind tunnel facilities visualize streak development removal also obtain preliminary quantitative drag reductions system. Flush mount hot-film sensors were used with detection algorithm lowspeed activate suction ports their growth phase. Suction coefficients ranged 0.0005 0.015. Hot-wire boundary-layer measurements friction drag. results show significant are possible low rates reduced mass flows.