Aerodynamically contoured, low drag wing engine and engine nacelle combination

摘要

A nacelle mounted by a pylon above and forwardly of a wing. The wing has a critical zone, which includes an area in the airstream flow about the wing where either of the following conditions occur: PP 1. The local pressure coefficient in the airstream has an absolute magnitude greater than 0.05,PP2. The airstream flow about the airfoil is supersonic.PPThe nacelle and pylon have a critical surface region which is a lower side surface portion of the nacelle and the contiguous pylon surface adjacent to a forwardly swept portion of the wing. The critical contour area of the nacelle surface is that portion of the critical surface region that is within the critical zone. The critical contour area of the nacelle and pylon are shaped to be in alignment with a plurality of airfoil stream lines that are immediately adjacent the critical contour area. Other surface portions of the nacelle are out of alignment with adjacent stream lines and correspond more closely to the engine structure contour.