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Unsteady Aerodynamics for Advanced Configurations: Part IV - Application of the Supersonic Mach Box Method to Intersecting Planar Lifting Surfaces

Report Number: FDL TDR 64-152 Part 4
Author: Moore, M. T.
Author: Andrew, L. V.
Corporate Author: North American Aviation, Incorporated
Laboratory: Air Force Flight Dynamics Laboratory
Date of Publication: 1965-05
Pages: 146
Contract: AF 33(657)-10399
Project: 1370
Task: 137003
AD Number: AD0619396

Ashley's approach to mutual interference theory by source superposition methods has been applied to the prediction of supersonic air loads on intersecting thin lifting surfaces in steady of oscillatory motion. Steady loading is regarded as the special case of zero frequency of oscillation. Each surface may be oscillating in a mode of rigid or elastic vibration or linear combinations thereof. Evvard's diaphragm concept has been extended to treat the out-of-plane interference problem. As a result, any leading or side edge on any of the intersecting surfaces may be subsonic. The study reported herein has lead to the formulation of a method by which diaphragm regions can be selected that eliminate the need for calculating out-of-plane velocity potentials. Based on mutual interference theory, the method requires only the calculation of out-of-plane velocities so that tangential flow conditions may be met. The Mach-box method has been used to obtain an approximate solution to the problem. In following the aerodynamic influence coefficient procedure of Zartarian and Hsu, each surface and diaphragm is overlaid with a grid of rectangular Mach boxes, the diagonals of which are parallel to the Mach lines.

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