Flight-Test Experiments on Cavity Flow in an SUU-41 Pod

Abstract

The conceptual development, design, ground test, and flight test of a novel weapons-cavity acoustics store separation pod led to several positive outcomes to aid in the understanding of cavity–store interaction. The weapons-cavity acoustics store separation pod was a modified SUU-41 pod (suspended utility unit) instrumented to collect forces and accelerations on a scaled model missile. In addition, time-resolved pressure and qualitative flowfield imaging were captured for the scaled cavity. This research included seven test missions on the F-16 Fighting Falcon. The flight-test data indicate that there is a clear correlation between loads and missile acceleration. The normal force, pitch moment, and acceleration data acquired for difference missile model configurations within the cavity yielded considerable insight into possible complications relating to store release. Pressure transducer data indicated the frequency of Rossiter tones and corresponded closely to results anticipated from prior flights involving the SUU-41 pod. Correlation between pressure transducer and loads/acceleration acting on the missile model was found to occur most commonly around Rossiter mode 2, indicating mode matching.