Effect of fluid inserts on low order models of jet noise reduction

Chitrarth Prasad, Philip J. Morris

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

8 Scopus citations


There have been several investigations of various methods to reduce noise in existing and next generation tactical jet aircraft engines. One such method is to use rows of injectors for steady blowing of bypass air at different locations in the divergent section of the nozzle. This results in the jet operating closer to an on-design condition and introduces streamwise vorticity that breaks the noise-producing large-scale turbulent structures of the jet. This fluid insert technology has been shown, at small and moderate scale, to effectively reduce noise up to 6dB in the peak noise radiation direction. Research has been performed in the past several years to demonstrate and improve upon this concept both in the form of experiments and computations. Some questions still remain about the behavior and working mechanisms of fluid inserts. Recently, an LES database was generated to provide further insight into the changes caused by the fluid inserts on the nozzle flow. This paper analyzes the LES database using Proper Orthogonal Decomposition of different flow variables as well as Doak’s Momentum Potential Theory to help understand the detailed mechanisms for the observed noise reductions.

Original languageEnglish (US)
Title of host publication25th AIAA/CEAS Aeroacoustics Conference, 2019
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105883
StatePublished - 2019
Event25th AIAA/CEAS Aeroacoustics Conference, 2019 - Delft, Netherlands
Duration: May 20 2019May 23 2019

Publication series

Name25th AIAA/CEAS Aeroacoustics Conference, 2019


Conference25th AIAA/CEAS Aeroacoustics Conference, 2019

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics
  • Electrical and Electronic Engineering
  • Aerospace Engineering


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