A New Forced Oscillation Capability for the Transonic Dynamics Tunnel
Abstract
A new forced oscillation system has been installed and tested at NASA Langley Research Center's Transonic Dynamics Tunnel (TDT). The system is known as the Oscillating Turntable (OTT) and has been designed for the purpose of oscillating, large semispan models in pitch at frequencies up to 40 Hz to acquire high-quality unsteady pressure and loads data. Precisely controlled motions of a wind-tunnel model on the OTT can yield unsteady aerodynamic phenomena associated with flutter, limit cycle oscillations, shock dynamics, and non-linear aerodynamic effects on many vehicle configurations. This paper will discuss general design and components of the OTT and will present test data from performance testing and from research tests on two rigid semispan wind-tunnel models. The research tests were designed to challenge the OTT over a wide range of operating conditions while acquiring unsteady pressure data on a small rectangular supercritical wing and a large supersonic transport wing. These results will be presented to illustrate the performance capabilities, consistency of oscillations, and usefulness of the OTT as a research tool.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- January 2002
- Bibcode:
- 2002STIN...0313004P
- Keywords:
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- Transonic Wind Tunnels;
- Unsteady Aerodynamics;
- Wind Tunnel Models;
- Wing Oscillations;
- Performance Tests;
- Wind Tunnel Apparatus;
- Wind Tunnel Tests;
- Semispan Models;
- Flutter;
- Performance Prediction;
- Pressure Distribution;
- Loads (Forces);
- Computational Fluid Dynamics;
- Fluid Mechanics and Thermodynamics