Reduction of Skin Friction Drag
range is limited by aerodynamic drag and even a modest reduction of the
drag provides significant fuel savings. Recent advances in electronics
and control technologies make active boundary layer control practical.
The integration of modern control systems with aerodynamic boundary
layer control allows a major reduction in skin friction drag.
has achieved significant results by providing a reduction in turbulent
boundary layer drag using active flow control devices without offsetting
aerodynamic penalties or excessive power requirements. Flow sensors and
a control system create a practical turbulent drag reduction system. The
system performance has been demonstrated during wind tunnel tests with
fuselage and wing models. In comparison with passive techniques, the
active device offers the benefits of smaller size, less device drag,
greater effectiveness and flexible control over a wide range of