Effects of Nacelle Position on Wing-Nacelle Interference
Abstract
The interference effects between an airfoil of high critical speed with no sweepback and a nacelle of high critical speed mounted in various positions with respect to the wing were investigated. A modified NACA fuselage form Ill was used in conjunction with a modified NACA 65-2l0 airfoil section. The main objective of this investigation was to obtain a wing-nacelle combination which has the force break occurring at a Mach number as high as for the wing alone. This objective was realized throughout the Mach number range of the tests 0 (up to 0.7) for angles of attack up to and including 2.5 with only a small loss in lift at a given angle of attack. A low nacelle position with the nose of the nacelle 0.66 chord ahead of the wing leading edge, with the upper surface of the wing tangent to the top nacelle line, and with the nacelle center line parallel to the wing chord gives a reasonable compromise between loss of lift and late drag rise. Raising the nacelle from the low nacelle position decreased the Mach number at which severe drag rises occurred. Moving the nacelle forward from this low position had little effect on the drag but increased the loss in lift. The presence of the nacelle in the most rearward position increased' the lift slightly. This combination, however, had the greatest drag rise of the low position nacelles at 50 angle of attack. The problem of obtaining a wing-nacelle combination which has good high-speed characteristics is greatly simplified by the use of components which by themselves have good high-speed characteristics.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1948
- Accession Number
- ADA381445
Entities
People
- Charles H. Mclellan
- John I. Cangelosi
Organizations
- National Aeronautics and Space Administration