| The flow over a 6:1 prolate spheroid undergoing transient maneuvers is studied. The Dynamic Plunge-Pitch-Roll (DyPPiR) model mount provides the unique capability to simulate truly unsteady maneuvers in a wind tunnel. The DyPPiR is presented along with several transducer systems used to study specific aspects of the spheroid flow field. The types of unsteady measurements performed include hot-film surface skin friction measurements, surface pressure measurements, and force and moment measurements. Unsteady measurements are much more difficult to perform than steady ones and require many special considerations. In light of this fact, each transducer system is examined in detail for its appropriateness in detecting unsteady phenomena and the associated uncertainties. Recommendations are made for each of these systems for the improvement of their accuracy and relevance in studying unsteady phenomena. In particular, time dependent separation locations are measured successfully for the first time, as are time dependent force and moment measurements. Steady and unsteady data are presented for each of these systems for two maneuvers: a 0... |
