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Side Loads in Dual Bell Nozzles, Part I: Phenomenology

Stark, Ralf and Nürnberger-Génin, Chloé (2010) Side Loads in Dual Bell Nozzles, Part I: Phenomenology. 46th AIAA Joint Propulsion Conference, 25.-28. Juli 2010, Nashville, TN, USA.

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Abstract

DLR conducted tests to study the side load characteristics in cold flow subscale dual bell nozzles. The side loads are related to different nozzle flow regimes. The most important are strong short time peaks induced by transition and retransition from sea level to high altitude mode and vice versa. In sea level and high altitude mode the dual bell creates less side loads than a comparable conventional nozzle. An additional flow regime could be confirmed, addressed as sneak transition. Contrary to the accepted doctrine, the flow separation in sea level mode will not be continuously fixed at the contour inflection. Before the actual transition to high altitude mode takes place the flow separates within the inflection region. As a result a distinct phase of side loads comparable to separated conventional nozzles is given. A procedure to reduce the regime of sneak transition is proposed.

Item URL in elib:https://elib.dlr.de/67605/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Side Loads in Dual Bell Nozzles, Part I: Phenomenology
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Stark, RalfRalf.Stark (at) dlr.deUNSPECIFIED
Nürnberger-Génin, ChloéChloe.Nuernberger-Genin (at) dlr.deUNSPECIFIED
Date:July 2010
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:side loads, flow separation, dual bell nozzle
Event Title:46th AIAA Joint Propulsion Conference
Event Location:Nashville, TN, USA
Event Type:international Conference
Event Dates:25.-28. Juli 2010
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W RP - Raumtransport
DLR - Research area:Space
DLR - Program:W RP - Raumtransport
DLR - Research theme (Project):W - Antriebsystemtechnik - Raketenantriebtests (old)
Location: Lampoldshausen
Institutes and Institutions:Institute of Space Propulsion > Technologie
Deposited By: Nürnberger-Genin, Chloe
Deposited On:16 Dec 2010 12:31
Last Modified:12 Dec 2013 21:10

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