Aerodynamic Interference for Supersonic Low-Aspect-Ratio Missiles


Interference factors Kw(B)KB(W), and Køare used in preliminary design in the equivalent-angie-of-attack method. An Euler code is used to numerically evaluate Kw(B)KB(W), and Køfor low-aspect-ratio, cruciform wing-bodies with clipped delta fins for Mach numbers from 3 to 4 and angles of attack up to 20 deg. The ratios of fin span to body radius (S/R) range from 1.3 to 2, so that aspect ratios vary from 0.05 to 4 and taper ratios vary from 0 to 0.975. Euler results compare well with experimental data. At low angle of attack Kw(B)is of the order of 1.5 for low-aspect-ratio fins. Kw(B)decreases as the angle of attack increases and can be less than 1 at large angles of attack. Shock and expansion waves from the fin interact with the body and strongly influence Kʙ(W). The afterbody length beyond the fin trailing edge also contributes to Kʙ(W).As the aspect ratio decreases from 4 to 0.05, Kʙ(W)increases to a maximum value and then 1) decreases for small angles of attack and 2) remains fairly constant for large angles of attack. Køis calculated for sideslip angles of ±3 deg. Euler predictions of Køare larger than slender-body predictions, because of vortex effects. Køis also influenced by shock and expansion waves from adjacent fins. At small angles of attack Køis larger for negative sideslip than it is for positive sideslip. At large angles of attack Købecomes independent of the sign of sideslip angle. © 1994 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.


Mechanical and Aerospace Engineering

International Standard Serial Number (ISSN)


Document Type

Article - Journal

Document Version


File Type





© 2024 American Institute of Aeronautics and Astronautics, All rights reserved.

Publication Date

01 Jan 1995