A Multi-Diagnostic Approach to Testing V/STOL Craft
نویسندگان
چکیده
§ The interactive aerodynamics of new V/STOL designs require a new approach to ground testing, where multiple properties are measured both on and away from surfaces during continuous changes in test parameters. Using a set of experiments of increasing complexity, a new capability is demonstrated for capturing surface pressure, velocity fields and vortex flow features over a range of test parameters. Two-dimensional velocity fields are captured over a full-scale UH-1 helicopter stabilator, a wing/canard configuration, and under the hub of a rotor in forward flight. Surface pressures and vortex flow features are captured over a wing/rotor configuration. Short tunnel run-times are achieved at the expense of large computational postprocessing resources. It is shown that such experiments can be performed while the configuration geometry and flow conditions are continuously varied through a wide range of parameters. This experiment led to the discovery and capture of massive flow separation caused by vortex interaction on wings at moderate angles of attack, large-scale deflection of vortex wake trajectories by wake/wing interaction, unsteady flows over wings generated by canard interaction, and quasisteady separation phenomena caused by the difference in time scales between separation and reattachment.
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تاریخ انتشار 1998