Aerodynamic Characteristics of a Three-Dimensional HLFC Wing in Transonic Flow

摘要

We conducted a transonic wind tunnel test of an HLFC wing model with a new211u001eleading edge suction system incorporated with a natural laminar flow airfoil to 211u001echeck mainly the drag reducing effect of the suction system in the transonic Mach 211u001enumber range. The test confirmed that the system works well in both design and 211u001eoff-design conditions, resulting in significant drag reduction in a wake drag 211u001ewith even a small amount of suction. Besides the drag reducing effect, we found 211u001ethat the system produces considerable lift increase for some suction quantity 211u001eranges in a wide range of test Mach number. The lift increment generates a higher 211u001eL/D value than that which may be expected from the drag reduction alone.