The Effects of Store Location, Store Incidence, and Wing Leading-Edge Geometry on the Incremental Lift and Drag of a Typical Missile-Type External Store

摘要

A systematic experimental study was conducted to determine the effect of store location, store incidence, and the aircraft wing leading-edge radius, droop, and sweep on the incremental lift and drag of a typical missile-type store. The study was conducted at Mach numbers between 0.80 and 1.15 for angles of attack from -3 to 15 degrees at zero sideslip, for aircraft wing leading-edge sweep angles of 25 and 50 degrees. The results of the study indicate that forward chordwise and/or inboard spanwise movement of the stores causes favorable increases in lift and decreases in drag, whereas increasing the vertical distance between the wing and store has the opposite effect. Increasing the store negative incidence causes the expected drag increase at angles of attack near zero but does not appear to provide the expected increase in (L/D)max and decrease in trim drag. The results also indicate that increasing the wing sweep causes a decrease in lift as well as drag, whereas increasing the wing droop or radius has little effect on lift and causes an increase in drag. Furthermore, these effects, though reduced quantitatively, are not altered qualitatively by the installation of external stores. (Author)