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Experimental Invest...
Experimental Investigations of Screech Mitigation and Amplification by Beveled and Double-Beveled Nozzles
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- Wei, X. F. (author)
- China Simulat Sci Co Ltd, 8 Kangqiao East Ave, Shanghai 201315, Peoples R China.
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- Chua, L. P. (author)
- Nanyang Technol Univ, Sch Mech & Aerosp Engn, 50 Nanyang Ave, Singapore 639798, Singapore.
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- Lu, Z. B. (author)
- Sun Yat Sen Univ, Sch Aeronaut & Astronaut, Shenzhen 518107, Peoples R China.
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- Lim, H. D. (author)
- Univ Southampton, Dept Aeronaut & Astronaut, Southampton SO17 1BJ, Hants, England.
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- Mariani, Raffaello, Assistant Prof. 1981- (author)
- KTH,Farkostteknik och Solidmekanik
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- Cui, Y. D. (author)
- Natl Univ Singapore, Temasek Labs, Singapore 117411, Singapore.
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- New, T. H. (author)
- Nanyang Technol Univ, Sch Mech & Aerosp Engn, 50 Nanyang Ave, Singapore 639798, Singapore.
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China Simulat Sci Co Ltd, 8 Kangqiao East Ave, Shanghai 201315, Peoples R China Nanyang Technol Univ, Sch Mech & Aerosp Engn, 50 Nanyang Ave, Singapore 639798, Singapore. (creator_code:org_t)
- American Society of Civil Engineers (ASCE), 2022
- 2022
- English.
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In: Journal of Aerospace Engineering. - : American Society of Civil Engineers (ASCE). - 0893-1321 .- 1943-5525. ; 35:4
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- An experimental study was conducted to investigate and compare the effects of beveled and double-beveled circular nozzles on supersonic jet screech at a nozzle pressure ratio of 5. In particular, near- and far-field microphone measurements and schlieren visualizations were utilized to look into selected acoustic and flow features associated with jet screech radiation. Results show that beveled nozzles eliminate jet screech by producing asymmetric shock structures and instability waves that are mismatched in phase and amplitude. In contrast, double-beveled nozzles produce symmetric shock structures and amplify screech intensity, even when jet mixing effects have been significantly enhanced. It is further observed that amplified jet screeches produced by double-beveled nozzles are highly unsteady and undergo nonperiodic and stochastic temporal variations. Last but not least, double-beveled nozzles also significantly impact screech peak noise locations and confer different changes along different measurement planes. The present study demonstrates that not all beveled-type nozzles are able to mitigate jet screech, with nonoptimal designs amplifying it instead.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Keyword
- Supersonic jet noise
- Shock noise
- Screech
- Acoustic measurements
- Lip-modified nozzle
Publication and Content Type
- ref (subject category)
- art (subject category)
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