Mean velocity and turbulence measurements of supersonic jets with fluidic inserts

Russell W. Powers, Scott M. Hromisin, Dennis K. McLaughlin, Philip J. Morris

Research output: Chapter in Book/Report/Conference proceedingConference contribution

11 Scopus citations

Abstract

The noise produced by the supersonic, high temperature jets that exhaust from military aircraft is becoming a hazard to naval personnel and a disturbance to communities near military bases. Fluidic inserts have been developed for noise reduction using distributed nozzle blowing. Fluidic inserts are created that simulate mechanical, hardwall corrugations, while having the advantage of being an on demand noise reduction method. This research focuses on detailed measurements of the flow field modifications created by the hardwalled and fluidic corrugations to better understand how each produces noise reduction of the jet. Unsteady velocity measurements using a Laser Doppler Velocimeter are performed on jets exhausting from nozzles with fluidic inserts and hardwall corrugations. Measured mean axial velocity and axial turbulence intensity are examined to illuminate the differences in the flow field from jets with fluidic inserts. Comparisons of laser Doppler measurements with RANS CFD simulations are shown with good agreement. The fluidic inserts produce less velocity deficit but more turbulence in the near exit region of the jet. After one jet diameter the mean flows are nearly identical, but the turbulent levels behind the fluidic inserts continue to be slightly higher than behind the hardwall corrugations.

Original languageEnglish (US)
Title of host publication54th AIAA Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624103933
StatePublished - Jan 1 2016
Event54th AIAA Aerospace Sciences Meeting, 2016 - San Diego, United States
Duration: Jan 4 2016Jan 8 2016

Publication series

Name54th AIAA Aerospace Sciences Meeting

Other

Other54th AIAA Aerospace Sciences Meeting, 2016
CountryUnited States
CitySan Diego
Period1/4/161/8/16

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All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

Cite this

Powers, R. W., Hromisin, S. M., McLaughlin, D. K., & Morris, P. J. (2016). Mean velocity and turbulence measurements of supersonic jets with fluidic inserts. In 54th AIAA Aerospace Sciences Meeting (54th AIAA Aerospace Sciences Meeting). American Institute of Aeronautics and Astronautics Inc, AIAA.