The 2005 annual reviews of Aeronautics and Astronautics were published in Aerospace America December 2005. You may check out these articles in the AIAA website.

The developments in aeroacoustics in 2005 were reviewed in three articles. Aeroacoustics (aeroacoustics_2005.pdf) by Jayanta Panda and the AIAA Aeroacoustics Technical Committee highlights some ongoing projects in the United States:

• Sonic boom mitigation technology and supersonic business jet (SBJ) development. (Supersonic Aerospace International with Lockheed Martin Skunk Works; Aerion)
• Engine/airframe aeroacoustics interaction: Fan nozzles with certain azimuthally varying nonsymmetric chevron distributions (Boeing/NASA/GE/Goodrich); integrated aircraft with embedded engines, engine bypass ratio about twice that of current technology, variable-area exit nozzle (University of Cambridge/MIT).
• Fan noise: variable-area nozzle (NASA Glen; Honeywell Aerospace).
• Jet noise: offsetting fan stream to shield noise from the higher speed primary jet (University of California, Irvine, and NASA); new mixer-tailpipe nozzle (Pratt&Whitney/United Technologies Research Center); Beveled nozzles (Pennsylvania State University/Boeing).
• Airframe noise: full-scale flight demonstration of airborne active flow manipulation of wake behind extenal pod (Airforce/Lockheed Martin/GE); open-jet anechoic wind tunnel suitable for airframe noise studies (University of Florida).

Some of the progresses in aeroacoustics were also reviewed in Fluid Dynamics (FluidDynamics_2005.pdf) by Ugo Piomelli and Meelan M. Choudhari:

• Direct numerical simulation (DNS) was applied in the study of large-eddy breakup devices to decrease cockpit noise (Boeing/St.Petersburg, Russia).
• Large-eddy simulation (LES) was performed to understand noise generation mechanisms near the leading-edge slat of a multielement high-lift configuration (NASA).
• Experimental study of trailing-edge noise using hot-wire anemometry, particle image velocimetry (PIV), and acoustic measurements (University of Notre Dame).
• Causal and globally stable Green's function was constructed for Lilley's equation with slightly diverged mean velocity profile (NASA Glen).
• Highly directional acoustic radiation from nonlinear, supersonic instabvility waves in turbulent jet (Imperial College).

One new acoustic measurement technique was mentioned in review Aerodynamic Measurement Technology (measurement_2005.pdf) by Mark Sheplak:

• MEMS-based piezoelevtric microphone for acoustic measurement applications (University of Florida/Sandia National Laboratories).