Jet and wing/flap interaction noise
Abstract
A detailed experimental study, using a model-scale jet and wing/flap configuration to represent an under-the-wing engine installation for a conventional take-off and landing aircraft, was carried out in the Lockheed anechoic wind tunnel. The objective was to determine the dependence of far-field noise on the important flow and geometric parameters. In particular, for a range of jet exit velocities and forward speeds, the experiments were designed to study the variation of noise as a function of: (1) longitudinal and transverse location of the jet exit with respect to the wing, (2) flap angle, (3) angle of attack, and (4) spanwise gap between flap segments. It is shown that the effects of those variables on far-field noise are most evident in the mid-frequency range but sometimes are seen outside that range. The mid-frequency hump is attributed primarily to interaction between the jet and the flap. Other noise contributions (over the jet alone case) are attributed to jet noise amplification at all frequencies by the sound generated in the jet/flap interaction and to the reflection of jet noise from the wing and flap surfaces.
- Publication:
-
Orbit-Raising and Maneuvering Propulsion: Research Status and Needs
- Pub Date:
- October 1984
- Bibcode:
- 1984aiaa.confU....B
- Keywords:
-
- Aerodynamic Noise;
- Body-Wing Configurations;
- Engine Airframe Integration;
- Interactional Aerodynamics;
- Jet Aircraft Noise;
- Wing Flaps;
- Aeroacoustics;
- Flow Deflection;
- Flow Velocity;
- Pylons;
- Split Flaps;
- Wind Tunnel Tests;
- Acoustics