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Reduction of supers...
Reduction of supersonic jet noise using micro-jets in the diverging part of a conical CD-nozzle
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- Hafsteinsson, Haukur, 1984 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Andersson, Niklas, 1976 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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Cuppoletti, Daniel (författare)
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visa fler...
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Gutmark, Ephraim (författare)
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visa färre...
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(creator_code:org_t)
- 2015
- 2015
- Engelska.
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Ingår i: The International Conference on Jets, Wakes and Separated Flows (ICJWSF2015), June 16-18, 2015, Stockholm, Sweden.
- Relaterad länk:
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https://research.cha...
Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Publikations- och innehållstyp
- kon (ämneskategori)
- ref (ämneskategori)