Captive Carry Analyses and Test Results of General Purpose Munitions Bomb

摘要

Prediction of aerodynamic, thermal and vibrational loadings on a store, which is carried out on an aircraft is an important criterion in the design area having the objective to define flight envelope, release envelope and life cycle of the store. External stores may change maneuverability and flight envelope of the installed flight platform drastically. On the other hand, flight envelope of the aircraft may result in an excessive heating on the electronic equipment of the store and vibration forces may end up with a structural failure. Hence, to predict aerodynamic, thermal and vibrational loadings on an external store during F4 aircraft captive carriage stage, numerical studies are carried out based on simulations and military standards. A CFD based analysis tool is used to predict the pressure variations on the store during different flight regimes of the aircraft Fully viscous, second order structured finite volume solutions are obtained for subsonic and transonic flight regimes. Change in inner and outer temperature values of the store was determined for certain flight conditions by making the heat transfer analysis of the external store with the help of 2-D and 3-D numerical methods, including radiation, convection, conduction heat transfers and the aerodynamic heating effects. An F4 fighter aircraft is instrumented for collecting the required data to verify the analysis tools and calculated data. The results of numerical predictions are compared and verified with the test data. The comparison graphs between the estimated vibration profiles by M1L-STD 810F and measured profiles are presented.