Development of Prediction Techniques for Aerodynamic Loads Acting on External Stores.

摘要

A preliminary design technique for the prediction of aerodynamic loads acting on external stores has been established through an empirical correlation of wind tunnel results obtained on a scale model of the F-111. Approximately 30,000 engineering data points were surveyed for various combinations of external stores. These data, originally stored on magnetic tape, were transferred to CDC 6600 disk packs. This was done to reduce the amount of computer run time required to collect the desired samples of data. For this study, correlations were performed of each aerodynamic component of load or moment acting on a particular store grouping as a function of various geometry parameters. The work was accomplished primarily through the utilization of numerical programs in which, through a series of trial and error calculations, an equation composed of various key geometry parameters was generated. The equations obtained for the numerical programs predict normal force, side force, pitching moment, yawing moment, and rolling moment for various external store arrangements.