Aeroacoustic Evaluation of Flap and Landing Gear Noise Reduction Concepts

@inproceedings{Khorrami2014AeroacousticEO,
  title={Aeroacoustic Evaluation of Flap and Landing Gear Noise Reduction Concepts},
  author={Mehdi R. Khorrami and William M. Humphreys and David P Lockard and Patricio A. Ravetta},
  year={2014}
}
Aeroacoustic measurements for a semi-span, 18% scale, high-fidelity Gulfstream aircraft model are presented. The model was used as a test bed to conduct detailed studies of flap and main landing gear noise sources and to determine the effectiveness of numerous noise mitigation concepts. Using a traversing microphone array in the flyover direction, an extensive set of acoustic data was obtained in the NASA Langley Research Center 14by 22-Foot Subsonic Tunnel with the facility in the acoustically… 
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34 Citations
Background Citations
1
Methods Citations
4
Results Citations
1

34 Citations

An Assessment of Flap and Main Landing Gear Noise Abatement Concepts
A detailed assessment of the acoustic performance of several noise reduction concepts for aircraft flaps and landing gear is presented. Consideration is given to the best performing concepts within…
Aerodynamic Measurements of a Gulfstream Aircraft Model With and Without Noise Reduction Concepts
Steady and unsteady aerodynamic measurements of a high-fidelity, semi-span 18% scale Gulfstream aircraft model are presented. The aerodynamic data were collected concurrently with acoustic…
Characterization of Flap Edge Noise Radiation from a High-Fidelity Airframe Model
The results of an experimental study of the noise generated by a baseline high-fidelity airframe model are presented. The test campaign was conducted in the open-jet test section of the NASA Langley…
Flight-Test Evaluation of Landing Gear Noise Reduction Technologies
TLDR
Results from the third Acoustics Research Measurements flight test demonstrate that significant noise reduction was achieved, however, the full noise reduction potential of the technologies could not be determined because of contamination from flap inboard edge noise and other secondary sources.
Evaluation of Airframe Noise Reduction Concepts via Simulations Using a Lattice Boltzmann Approach
Unsteady computations are presented for a high-fidelity, 18% scale, semi-span Gulfstream aircraft model in landing configuration, i.e. flap deflected at 39 degree and main landing gear deployed. The…
Evaluation of the noise impact of flap-tip fences installed on laminar wings
TLDR
The effectiveness of the flap-tip fences to successfully reduce the flap side-edge noise has been definitely verified both through the analysis of the acoustic maps retrieved from the beamforming investigation and by the estimation of the overall variation of the EPNL with respect to a baseline reference configuration without low-noise devices.
Experimental Aeroacoustic and Aerodynamic Analysis of a Large-scale Flap Side-edge Model
TLDR
This research investigates the relationship between the parameters of a large-scale flap model at 1.50× 106 Reynolds number and the physics responsible for flap side-edge noise generation, one of the most dominant sources of the airframe noise.
Flow-Field Investigation of Gear-Flap Interaction on a Gulfstream Aircraft Model
Off-surface flow measurements of a high-fidelity 18% scale Gulfstream aircraft model in landing configuration with the main landing gear deployed are presented. Particle Image Velocimetry (PIV) and…
Flight and Ground Operations in Support of Airframe Noise Reduction Tests
TLDR
The hardware development, ground operations, and flight operations which went into acquiring the desired acoustic measurements were provided, and in general, the flights were successful and demonstrated the noise reduction benefits of the ACTE flaps, the LAGER gear fairings, and the L AGER gear cavity treatments.
Towards Full Aircraft Airframe Noise Prediction: Detached Eddy Simulations
Results from a computational study on the aeroacoustic characteristics of an 18%-scale, semi-span Gulf-stream aircraft model are presented in this paper. NASA's FUN3D unstructured compressible…
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References

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Steady and unsteady aerodynamic measurements of a high-fidelity, semi-span 18% scale Gulfstream aircraft model are presented. The aerodynamic data were collected concurrently with acoustic…
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In this paper, we present steady aerodynamic measurements for an 18% scale model of a Gulfstream air-craft. The high fidelity and highly-instrumented semi-span model was developed to perform detailed…
Characterization of Flap Edge Noise Radiation from a High-Fidelity Airframe Model
The results of an experimental study of the noise generated by a baseline high-fidelity airframe model are presented. The test campaign was conducted in the open-jet test section of the NASA Langley…
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Flow-Field Investigation of Gear-Flap Interaction on a Gulfstream Aircraft Model
Off-surface flow measurements of a high-fidelity 18% scale Gulfstream aircraft model in landing configuration with the main landing gear deployed are presented. Particle Image Velocimetry (PIV) and…
Aerodynamic Noise Reduction for High-Lift Devices on a Swept Wing Model
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Towards Full Aircraft Airframe Noise Prediction: Detached Eddy Simulations
Results from a computational study on the aeroacoustic characteristics of an 18%-scale, semi-span Gulf-stream aircraft model are presented in this paper. NASA's FUN3D unstructured compressible…
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