Reduction of supersonic jet noise using micro-jets in the diverging part of a conical CD-nozzle

Hafsteinsson, Haukur,1984Chalmers tekniska högskola,Chalmers University of Technology (författare)

Reducing the radiated noise from supersonic jets with maintainedthrust is a major challenge. An LES/CAA method and experiments are uti-lized to investigate the flow field and the far-field acoustics of a supersonic jetemitted from a circular CD-nozzle with a sharp throat. Air is injected into thedivergent section of the nozzle using 12 evenly distributed micro-jets aroundthe nozzle circumference and the change in total thrust and acoustic signa-ture is investigated. The micro-jets are shown to decrease shock-strength withincreased injection until an optimum point where further increase in injectionmass flow caused increased shock-strength. As a consequence of the reducedshock strength, the far-field shock-noise was decreased. The net thrust wasshown to increase with increased injection mass flow, whereas the specificthrust was slightly decreased. Micro-jet injection into the divergent sectionof a CD-nozzle appears, therefore, to be an effective configuration for reducedshock-noise radiation from supersonic jets.

Andersson, Niklas,1976Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)nian (författare)
Cuppoletti, Daniel (författare)
Gutmark, Ephraim (författare)
Chalmers tekniska högskola (creator_code:org_t)

Ingår i:The International Conference on Jets, Wakes and Separated Flows (ICJWSF2015), June 16-18, 2015, Stockholm, Sweden

Av författaren/redakt...: Hafsteinsson, Ha ...; Andersson, Nikla ...; Cuppoletti, Dani ...; Gutmark, Ephraim

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