Matches in SemOpenAlex for { <https://semopenalex.org/work/W801644558> ?p ?o ?g. }
Showing items 1 to 71 of
71
with 100 items per page.
- W801644558 abstract "Noise characteristics of convergent-divergent (C-D) nozzles in the overexpanded regime are the focus of this paper. The flow regime is encountered during takeoff and landing of certain airplanes and also with rocket nozzles in launch-pad environment. Experimental results from laboratory-scale single nozzles are discussed. The flow often undergoes a resonance accompanied by emission of tones (referred to as transonic tones). The phenomenon is different from the well-known screech tones. Unlike screech, the frequency increases with increasing supply pressure. There is a staging behavior odd harmonic stages occur at lower pressures while the fundamental occurs in a range of relatively higher pressures. A striking feature is that tripping of the nozzle s internal boundary layer tends to suppress the resonance. However, even in the absence of tones the broadband levels are found to be high. That is, relative to a convergent case and at same pressure ratio, the C-D nozzles are found to be noisier, often by more than 10dB. This excess broadband noise (referred to as EBBN) is further explored. Its characteristics are found to be different from the well-known broadband shockassociated noise ( BBSN ). For example, while the frequency of the BBSN peak varies with observation angle no such variation is noted with EBBN. The mechanisms of the transonic tone and the EBBN are not completely understood yet. They appear to be due to unsteady shock motion inside the nozzle. The shock drives the flow downstream like a vibrating diaphragm, and resonance takes place similarly as with acoustic resonance of a conical section having one end closed and the other end open. When the boundary layer is tripped, apparently a breakdown of azimuthal coherence suppresses the resonance. However, there is still unsteady shock motion albeit with superimposed randomness. Such random motion of the internal shock and its interaction with the separated boundary layer produces the EBBN." @default.
- W801644558 created "2016-06-24" @default.
- W801644558 creator A5091485342 @default.
- W801644558 date "2013-06-27" @default.
- W801644558 modified "2023-09-23" @default.
- W801644558 title "Transonic Tones and Excess Broadband Noise in Overexpanded Supersonic Jets" @default.
- W801644558 hasPublicationYear "2013" @default.
- W801644558 type Work @default.
- W801644558 sameAs 801644558 @default.
- W801644558 citedByCount "0" @default.
- W801644558 crossrefType "book" @default.
- W801644558 hasAuthorship W801644558A5091485342 @default.
- W801644558 hasConcept C103838597 @default.
- W801644558 hasConcept C109214941 @default.
- W801644558 hasConcept C111603439 @default.
- W801644558 hasConcept C120763676 @default.
- W801644558 hasConcept C121332964 @default.
- W801644558 hasConcept C126322002 @default.
- W801644558 hasConcept C13393347 @default.
- W801644558 hasConcept C139210041 @default.
- W801644558 hasConcept C205991772 @default.
- W801644558 hasConcept C24890656 @default.
- W801644558 hasConcept C2781300812 @default.
- W801644558 hasConcept C56200935 @default.
- W801644558 hasConcept C57879066 @default.
- W801644558 hasConcept C68115822 @default.
- W801644558 hasConcept C71924100 @default.
- W801644558 hasConcept C97355855 @default.
- W801644558 hasConceptScore W801644558C103838597 @default.
- W801644558 hasConceptScore W801644558C109214941 @default.
- W801644558 hasConceptScore W801644558C111603439 @default.
- W801644558 hasConceptScore W801644558C120763676 @default.
- W801644558 hasConceptScore W801644558C121332964 @default.
- W801644558 hasConceptScore W801644558C126322002 @default.
- W801644558 hasConceptScore W801644558C13393347 @default.
- W801644558 hasConceptScore W801644558C139210041 @default.
- W801644558 hasConceptScore W801644558C205991772 @default.
- W801644558 hasConceptScore W801644558C24890656 @default.
- W801644558 hasConceptScore W801644558C2781300812 @default.
- W801644558 hasConceptScore W801644558C56200935 @default.
- W801644558 hasConceptScore W801644558C57879066 @default.
- W801644558 hasConceptScore W801644558C68115822 @default.
- W801644558 hasConceptScore W801644558C71924100 @default.
- W801644558 hasConceptScore W801644558C97355855 @default.
- W801644558 hasLocation W8016445581 @default.
- W801644558 hasOpenAccess W801644558 @default.
- W801644558 hasPrimaryLocation W8016445581 @default.
- W801644558 hasRelatedWork W1654418464 @default.
- W801644558 hasRelatedWork W1996678711 @default.
- W801644558 hasRelatedWork W2037821122 @default.
- W801644558 hasRelatedWork W2061441003 @default.
- W801644558 hasRelatedWork W2064218267 @default.
- W801644558 hasRelatedWork W2065659600 @default.
- W801644558 hasRelatedWork W2077215357 @default.
- W801644558 hasRelatedWork W2094711805 @default.
- W801644558 hasRelatedWork W2100413300 @default.
- W801644558 hasRelatedWork W2317163627 @default.
- W801644558 hasRelatedWork W2319463167 @default.
- W801644558 hasRelatedWork W2326412656 @default.
- W801644558 hasRelatedWork W2330016450 @default.
- W801644558 hasRelatedWork W2756055908 @default.
- W801644558 hasRelatedWork W2766994251 @default.
- W801644558 hasRelatedWork W3046968587 @default.
- W801644558 hasRelatedWork W3166906916 @default.
- W801644558 hasRelatedWork W3203664259 @default.
- W801644558 hasRelatedWork W854026073 @default.
- W801644558 hasRelatedWork W2089038257 @default.
- W801644558 isParatext "false" @default.
- W801644558 isRetracted "false" @default.
- W801644558 magId "801644558" @default.
- W801644558 workType "book" @default.