@inproceedings{988df2940c5647cba1cfe4addbad402e,
title = "Extending on-demand noise reduction technology to military-style nozzles with 6 fluidic corrugations",
abstract = "The fluidic corrugation on-demand noise reduction technology has been extended to military-style nozzles with 6 fluidic corrugations. Measured far-field acoustics for jets exhausting from a 6 fluidic corrugation nozzle are compared to jets exhausting from nozzles with 3 fluidic corrugations and 6 hard-walled corrugations. Unheated jet measurements of nozzles with fluidic corrugations and hardwalled corrugations demonstrated up to 5 dB reductions in the turbulent mixing noise at the peak frequency and over 3 dB OASPL noise reductions in the rear arc. An analysis of the skewness of the pressure derivative from heat-simulated jet measurements suggested hard-walled corrugations and fluidic corrugations decreased jet crackle. Heat-simulated jet experiments using the 6 fluidic corrugation nozzle showed a peak noise reduction of 2.9 dB OASPL in the rear arc. Prior heatsimulated jet experiments using nozzles with 3 fluidic corrugations demonstrated noise reductions in excess of 5 dB OASPL in the peak noise direction. Reasons for the decreased performance of the 6 fluidic corrugation nozzle are proposed and will be the subject of future investigations.",
author = "Hromisin, {Scott M.} and Powers, {Russell W.} and McLaughlin, {Dennis K.} and Morris, {Philip J.}",
note = "Funding Information: This research was supported in part by the Office of Naval Research, Contract # N00014-14-C-0157, contracting officer Dr. Knox Millsaps. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the Office of Naval Research, or the U.S. government. Publisher Copyright: {\textcopyright} 2017, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.; 23rd AIAA/CEAS Aeroacoustics Conference, 2017 ; Conference date: 05-06-2017 Through 09-06-2017",
year = "2017",
language = "English (US)",
isbn = "9781624105043",
series = "23rd AIAA/CEAS Aeroacoustics Conference, 2017",
publisher = "American Institute of Aeronautics and Astronautics Inc, AIAA",
booktitle = "23rd AIAA/CEAS Aeroacoustics Conference, 2017",
}