The journal article, “Computational Analyses of Offset-Stream Nozzles for Noise Reduction,” received the award of Best Paper by a Young Professional from the American Institute of Aeronautics and Astronautics Northern Ohio Section. The article, published in the Journal of Propulsion and Power (Jan.-Feb. 2009, Vol. 25, No. 1), was authored by NASA GRC’s Vance Dippold and Lancert Foster (Inlet & Nozzle Branch); and NASA Langley’s Michael Wiese (Analytical Systems and Materials).
The work described includes usage of the Wind-US code was to perform Reynolds-averaged Navier-Stokes calculations on two offset-stream-nozzle concepts for jet noise reduction. The analyses were completed in preparation for a series of experimental tests in which noise and flowfield measurements were made. The offset-stream nozzles demonstrated good performance and reduced the amount of turbulence on the lower side of the jet plume.
These computer analyses proved instrumental in guiding the development of the final test configurations and giving insight into the flow mechanics of offset-stream nozzles. The computational predictions were compared with flowfield results from the jet-rig testing and showed excellent agreement. This work was in support of the previous Advanced Subsonic Technology program.
