Noise Control of Supersonic Jet with Steady and Flapping Fluidic Injection
Journal article, 2015

Large-eddy simulation is used to investigate steady-state mass flow injection into a supersonic jet stream with and without flapping motion of the microjets. The results are validated with particle image velocimetry and acoustic measurements. The effect of microjet penetration on the far-field acoustics is studied by altering the number of injectors, the cross-sectional area of each injector, and the injection mass flow. The injectors are evenly distributed around the nozzle exit. The injection angle is 90 deg relative to the main jet flow. This research is a continuation of a previous large-eddy simulation study of pulsed injection that showed that the unsteady injection-induced pressure pulses in the jet caused increased tonal noise for far-field observers at low angles. Flapping jet injection was shown to minimize the creation of the pressure pulses, except for high-amplitude flapping angles and high injection mass flows, where the injections divert out of the shear layer and introduce periodic superposition of the double shock-cell structure. Furthermore, the flapping injection did not show improved noise reduction compared with the steady injection, which is essentially promising because steady injection proves to be a more practical solution for implementation in real jet engine applications.


Supersonic Jet

Flow Control


Noise Control


Haukur Hafsteinsson

Chalmers, Applied Mechanics, Fluid Dynamics

Lars-Erik Eriksson

Chalmers, Applied Mechanics, Fluid Dynamics

Niklas Andersson

Chalmers, Applied Mechanics, Fluid Dynamics

Daniel R Cuppoletti

Ephraim Gutmark

AIAA Journal

0001-1452 (ISSN) 1533-385X (eISSN)

Vol. 53 11 3251-3272

Driving Forces

Sustainable development

Areas of Advance


Subject Categories

Aerospace Engineering

Fluid Mechanics and Acoustics


C3SE (Chalmers Centre for Computational Science and Engineering)



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