Aerodynamic Noise Simulation In Sonic Fatigue Facility
Report Number: AFFDL TR 66-112
Author(s): Lyon, R. H., Gordon, C. G., Stern, R., Wiener, F. M.
Corporate Author(s): Bolt Beranek And Newman Inc Cambridge Mass
Laboratory: Air Force Flight Dynamics Laboratory
Date of Publication: 1966-11
Pages: 72
Contract: AF 33(615)-1290
DoD Project: 4437
DoD Task: 443701
Identifier: AD0648022
Abstract:
The possibility of simulating a turbulent boundary-layer noise environment using the air-flow capability of the RTD Sonic Fatigue Facility is investigated. The philosophy is adopted that it is the mechanical power absorbed by the structure from the environment that is to be duplicated. Calculations are developed that allow the prediction of the mechanical power injected into a structure by a turbulent boundary layer (TBL), and by a turbulent wall-jet. The possibility of replacing the power injected by the TBL by using turbulent wall-jets impinging on a structural model of a section of a supersonic transport is studied. Results indicate that high-frequency excitation (above 1kHz) can be adequately simulated, but that the air-flow capabilities of the facility would be exceeded by an attempt to excite a structure as large as the one chosen by a set of wall-jets at lower frequencies.
Provenance: Lockheed Martin Missiles & Fire Control
Author(s): Lyon, R. H., Gordon, C. G., Stern, R., Wiener, F. M.
Corporate Author(s): Bolt Beranek And Newman Inc Cambridge Mass
Laboratory: Air Force Flight Dynamics Laboratory
Date of Publication: 1966-11
Pages: 72
Contract: AF 33(615)-1290
DoD Project: 4437
DoD Task: 443701
Identifier: AD0648022
Abstract:
The possibility of simulating a turbulent boundary-layer noise environment using the air-flow capability of the RTD Sonic Fatigue Facility is investigated. The philosophy is adopted that it is the mechanical power absorbed by the structure from the environment that is to be duplicated. Calculations are developed that allow the prediction of the mechanical power injected into a structure by a turbulent boundary layer (TBL), and by a turbulent wall-jet. The possibility of replacing the power injected by the TBL by using turbulent wall-jets impinging on a structural model of a section of a supersonic transport is studied. Results indicate that high-frequency excitation (above 1kHz) can be adequately simulated, but that the air-flow capabilities of the facility would be exceeded by an attempt to excite a structure as large as the one chosen by a set of wall-jets at lower frequencies.
Provenance: Lockheed Martin Missiles & Fire Control