The initial evaluation of a large-chord, swept, supercritical airfoil incorporating an active laminar-flow-control (LFC) suction system with a perforated upper surface is documented in a chronological manner, and the deficiencies in the suction capability of the perforated panels as designed are described. The experiment was conducted in the Langley 8-Foot Transonic Pressure Tunnel. Also included is an evaluation of the influence of the proximity of the tunnel liner to the upper surface of the airfoil pressure distribution. Harris, Charles D. and Brooks, Cuyler W., Jr. and Clukey, Patricia G. and Stack, John P. Langley Research Center AIRFOILS; BOUNDARY LAYER CONTROL; LAMINAR BOUNDARY LAYER; LAMINAR FLOW; SUPERCRITICAL WINGS; SWEPT WINGS; TRANSONIC FLOW; WIND TUNNEL TESTS; PRESSURE DISTRIBUTION; SUCTION; TRANSONIC WIND TUNNELS...

The initial evaluation of a large-chord, swept, supercritical airfoil incorporating an active laminar-flow-control (LFC) suction system with a perforated upper surface is documented in a chronological manner, and the deficiencies in the suction capability of the perforated panels as designed are described. The experiment was conducted in the Langley 8-Foot Transonic Pressure Tunnel. Also included is an evaluation of the influence of the proximity of the tunnel liner to the upper surface of the airfoil pressure distribution. Harris, Charles D. and Brooks, Cuyler W., Jr. and Clukey, Patricia G. and Stack, John P. Langley Research Center AIRFOILS; BOUNDARY LAYER CONTROL; LAMINAR BOUNDARY LAYER; LAMINAR FLOW; SUPERCRITICAL WINGS; SWEPT WINGS; TRANSONIC FLOW; WIND TUNNEL TESTS; PRESSURE DISTRIBUTION; SUCTION; TRANSONIC WIND TUNNELS...