Noise reduction for an unheated mach 0.9 jet by Fluidic injection

Pankaj Rajput, Sunil Kumar, Iraj Kalkhoran

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


The aim of this investigation is to perform a computational analysis of jet noise reduction using a novel fluidic injection scheme that injects microjets at an axial location downstream from the nozzle exhaust. Contrary to previous studies which injected fluid either inside the nozzle or just at the nozzle exhaust, this injection scheme injects 4 equally spaced microjets perpendicular to the jet axis at an axial location downstream from the nozzle exhaust via a coaxial tube. Isothermal jet-injector configuration was tested for a Mach 0.9 single stream nozzle with continuous injection. Instantaneous aerodynamic fields are obtained using Large Eddy Simulation (LES) and the results are validated with previous experimental results. Three different axial locations for microjet injections are considered in this study. The results suggests that the presence of coaxial injector tube significantly alters the flow field leading to shorter jet core and a reduction in the far-field noise. When the fluid injection is activated there is a decrease in the turbulence in the jet core due to enhanced mixing, leading to a decrease of the far field broadband noise.

Original languageEnglish (US)
Title of host publication23rd AIAA/CEAS Aeroacoustics Conference, 2017
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105043
StatePublished - Jan 1 2017
Event23rd AIAA/CEAS Aeroacoustics Conference, 2017 - Denver, United States
Duration: Jun 5 2017Jun 9 2017

Publication series

Name23rd AIAA/CEAS Aeroacoustics Conference, 2017


Other23rd AIAA/CEAS Aeroacoustics Conference, 2017
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Aerospace Engineering
  • Electrical and Electronic Engineering


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