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

Haukur Hafsteinsson (Institutionen för tillämpad mekanik, Strömningslära) ; Niklas Andersson (Institutionen för tillämpad mekanik, Strömningslära) ; Daniel Cuppoletti ; Ephraim Gutmark
The International Conference on Jets, Wakes and Separated Flows (ICJWSF2015), June 16-18, 2015, Stockholm, Sweden (2015)
[Konferensbidrag, refereegranskat]

Reducing the radiated noise from supersonic jets with maintained thrust 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 jet emitted from a circular CD-nozzle with a sharp throat. Air is injected into the divergent section of the nozzle using 12 evenly distributed micro-jets around the nozzle circumference and the change in total thrust and acoustic signa- ture is investigated. The micro-jets are shown to decrease shock-strength with increased injection until an optimum point where further increase in injection mass flow caused increased shock-strength. As a consequence of the reduced shock strength, the far-field shock-noise was decreased. The net thrust was shown to increase with increased injection mass flow, whereas the specific thrust was slightly decreased. Micro-jet injection into the divergent section of a CD-nozzle appears, therefore, to be an effective configuration for reduced shock-noise radiation from supersonic jets.



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Denna post skapades 2015-08-27.
CPL Pubid: 221300

 

Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Strömningslära (2005-2017)

Ämnesområden

Transport
Hållbar utveckling
Strömningsmekanik och akustik
Akustik
Strömningsmekanik

Chalmers infrastruktur