Phased acoustic array measurements of a 5.75% hybrid wing body aircraft

Abstract

Detailed acoustic measurements of the noise from the leading-edge Krueger flap of a 5.75% hybrid wing body aircraft model were acquired with a traversing phased microphone array in the Arnold Engineering Development Complex NFAC 40- by 80-foot wind tunnel. The spatial resolution of the array was sufficient to distinguish between individual support brackets over the full-scale frequency range of 100 to 2875 Hz. For conditions representative of landing and take-off configuration, the noise from the brackets dominated other sources near the leading edge. Inclusion of flight-like brackets for select conditions highlights the importance of including the correct number of leading-edge high-lift device brackets with sufficient scale and fidelity. These measurements support the development of a Krueger noise model which includes cove and bracket noise.

Keywords

Phased microphone array Krueger flap noise hybrid wing body high fidelity brackets

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References

Guo Y, Brusniak L, Czech M, et al. Hybrid wing body (HWB) slat noise analysis. In: 51st AIAA aerospace sciences meeting, Grapevine, Texas, 7–10 January 2013, AIAA paper 2013-0462.

Horne WC, Burnside NJ, Soderman PT, et al. Aeroacoustic study of a 26%-scale semi-span model of a Boeing 777 wing in the NASA Ames 40- by 80-foot wind tunnel, NASA/TP-2004-2128028, October 2004.

Dickey ED, Princen NH, Bonet JT, et al. Wind tunnel model design and fabrication of a 5.75% scale blended-wing-body twin jet configuration. In: 54th AIAA aerospace sciences meeting, San Diego, California, 4–8 January 2016, AIAA paper 2016-0008.

Underbrink

Aeroacoustic phased array testing in low speed wind tunnels. In: Mueller

(ed). Aeroacoustic measurements, New York, NY: Springer-Verlag, 2002, pp. 109–117.

Dougherty RP. Functional beamforming for aeroacoustic source distributions. In: 20th AIAA/CEAS aeroacoustics conference, Atlanta, Georgia, 16–20 June 2014, AIAA paper 2014-3066.

Dougherty RP and Podboy GG. Improved phased array imaging of a model jet. In: 15th AIAA/CEAS aeroacoustics conference, Miami, Florida, 11–13 May 2009, AIAA paper 2009-3186.

Sijtsma P. CLEAN based on spatial source coherence. In: 13th AIAA/CEAS aeroacoustics conference, Rome, Italy, 21–23 May 2007, AIAA paper 2007-3436.

Dougherty RP. Extensions of DAMAS and benefits and limitations of deconvolution in beamforming. In: 11th AIAA/CEAS aeroacoustics conference, Monterey, California, 23–25 May 2005, AIAA paper 2005-2961.

Soderman

Allen

Microphone measurements in and out of airstream. In: Mueller

(ed). Aeroacoustic measurements, New York, NY: Springer-Verlag, 2002, pp. 32–33.

10.

Jaeger SM, Horne WC and Allen CS. Effect of surface treatment on array microphone self-noise. In: 6th AIAA/CEAS aeroacoustics conference, Lahaina, Hawaii, 12–14 June 2000, AIAA paper 2000-1937.

11.

Shields FD and Bass HE. Atmospheric absorption of high frequency noise and application to fractional-octave bands. NASA CR 2760, 1977.

12.

Dobrzynski

. Almost 40 years of airframe noise research: what did we achieve? J Aircraft 2010; 47(2): 353–367.

13.

Guo YP. Aircraft slat noise modeling and prediction. In: 16th AIAA/CEAS aeroacoustics conference, Stockholm, Sweden, 7–9 June 2010, AIAA paper 2010-3837.

14.

Guo YP, Burley CL and Thomas RH. Modeling and prediction of Krueger device noise. In: 22nd AIAA/CEAS aeroacoustics conference, Lyon, France, 30 May–1 June 2016, AIAA paper 2016-2957.