Calculation of Forces on Aircraft Stores Located in Distributed Flow Fields for Application in Store Separation Prediction
Final rept. 1 Apr 1970-30 Jun 1971
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
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The aerodynamic characteristics of an M-117 bomb in steady, incompressible, potential flow are computed by representing the bomb planform with a discrete network of vortex singularities. Distribution of velocity and pressure coefficients over the bomb, as well as total force and moment coefficients, are calculated as functions of pitch attitude, the surrounding flow field, and various assumed vortex-lattice modelings. Both spatially uniform and nonuniform flow fields are investigated the nonuniformities were created by the presence of a parent aircraft. For a properly modeled bomb immersed in a uniform flow, the lift and pitching moment coefficients summed over the entire configuration are found to be within 10 percent of wind tunnel measurements. When the bomb is surrounded by the disturbance flow field produced by an F-4C aircraft, the incremental effects on lift and pitching moment are very similar for theory and experiment.
- Attack and Fighter Aircraft
- Aerial Bombs