21st Congress of International Council of the Aeronautical Sciences, Melbourne, Australia, 13-18 September, 1998
Paper ICAS-98-2.10.3

AN ENGINEERING METHODOLOGY FOR SUBSONIC STORE TRAJECTORY PREDICTION

Bulbeck C. J., McKenzie G. J., Fairlie B. D.
Aeronautical and Maritime Research Lab., Australia

Keywords: subsonic store trajectory prediction

A new engineering methodology is presented to predict the loads on a store in the no uniform flow field beneath an aircraft. The method requires that only the flow field beneath the aircraft, the carriage loads and the store free stream aerodynamics are known. The flow field beneath the aircraft is readily obtainable from CFD computations. Assuming a linear velocity gradient in the vicinity of store, the components of the velocity gradient tensor as well as the local mean flow are determined by interpolation of the flow field, and the antisymmetric part of the velocity gradient tensor used to define an effective store rotation rate. The loads on the store due to the mean flow field as well as the flow field non-uniformity can then be computed using the known store free stream aerodynamics and dynamic derivatives. This method is used to predict the separation of an air-Iayed sea mine from a P3C maritime patrol aircraft, and the results are compared with another CFD-based store trajectory prediction method.

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