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Study of Restricted Shock Separation Phenomena in a Thrust Optimized Parabolic Nozzle

Haidn, Oskar und Verma, S. B. (2009) Study of Restricted Shock Separation Phenomena in a Thrust Optimized Parabolic Nozzle. Journal of Propulsion and Power, 25 (5), Seiten 1046-1057. American Institute of Aeronautics and Astronautics (AIAA). doi: 10.2514/1.42351. ISSN 0748-4658.

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Kurzfassung

An experimental investigation has been carried out on a subscale thrust optimized parabolic nozzle (area ratio of 30) to study the flow characteristics prevalent during a partially formed restricted shock separation and a fully formed restricted shock separation condition, each of which are observed to be discrete in nature. Whereas the wall pressure signal near the nozzle exit randomly alternates between its value in the backflow region and that above ambient (i.e., flow randomly alternates between a free shock separation and restricted shock separation transition condition and vice versa) as a function of time for a partially formed restricted shock separation condition, the wall pressure in a fully formed restricted shock separation condition fluctuates in values above ambient in the region of flow reattachment. Further, the transient conditions of free shock separation to partially formed restricted shock separation and end-effect regime are studied in detail. The preceding transitions and retransitions suggest a variation in the relative axial positions of normal and separation shocks that favors a fully formed restricted shock separation to occur during shutdown. A second separation bubble is also observed in the restricted shock separation condition, the formation and opening of which is seen to contribute toward side-load peaks. Results also indicate that the separation shock translates back and forth (flapping motion) and experiences spanwise perturbations (rippling motion). The results are based on simultaneously acquired real-time wall pressure measurements, surface oil visualization technique, high-speed schlieren images, and signals from strain gauges installed on the nozzle bending tube.

elib-URL des Eintrags:https://elib.dlr.de/59893/
Dokumentart:Zeitschriftenbeitrag
Titel:Study of Restricted Shock Separation Phenomena in a Thrust Optimized Parabolic Nozzle
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Haidn, OskarOskar.Haidn (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Verma, S. B.NICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:September 2009
Erschienen in:Journal of Propulsion and Power
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:25
DOI:10.2514/1.42351
Seitenbereich:Seiten 1046-1057
Verlag:American Institute of Aeronautics and Astronautics (AIAA)
ISSN:0748-4658
Status:veröffentlicht
Stichwörter:parabolic nozzle, shock separation
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W - keine Zuordnung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W - keine Zuordnung
DLR - Teilgebiet (Projekt, Vorhaben):W - keine Zuordnung (alt)
Standort: Lampoldshausen
Institute & Einrichtungen:Institut für Raumfahrtantriebe > Technologie
Hinterlegt von: Hanke, Michaela
Hinterlegt am:08 Sep 2009 20:02
Letzte Änderung:28 Jul 2022 16:42

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