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Flow separation Studies During the Transition Models of a Sub-Scale Dual-Bell Nozzle

Verma, S.B. and Stark, Ralf and Nürnberger-Génin, C. and Haidn, O. (2009) Flow separation Studies During the Transition Models of a Sub-Scale Dual-Bell Nozzle. In: Proceedings of the 45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, Denver, Colorado. 45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 2. - 5. Aug. 2009, Denver, Colorado, USA.

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Abstract

Abstract: An experimental investigation has been carried out to study the flow characteristics of a dual-bell nozzle during its transition modes. Cold gas tests using gaseous nitrogen were carried out in (i) a horizontal test rig with nozzle exhausting into atmospheric conditions and, (ii) also inside a high altitude simulation chamber with nozzle operation under self-evacuation mode. Transient tests indicate that increasing 0P0 /0t reduces the transition time as well as the amplitude of pressure fluctuations of separation shock at wall inflection point. Sea-level tests show 15-17% decrease in transition NPR during subsequent tests in a single run primarily due to frost formation in the nozzle extension up to the wall inflection location. This reduces the wall inflection angle and hence, the transition NPR. However, tests inside the altitude chamber show nearly constant NPR value during subsequent runs primarily due to decrease in back temperature with decrease in back pressure that prevents any frost formation.

Item URL in elib:https://elib.dlr.de/62382/
Document Type:Conference or Workshop Item (Speech)
Title:Flow separation Studies During the Transition Models of a Sub-Scale Dual-Bell Nozzle
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Verma, S.B.NAL Bangalore, IndiaUNSPECIFIED
Stark, RalfRalf.Stark (at) dlr.dehttps://orcid.org/0000-0003-1923-1901
Nürnberger-Génin, C.Chloe.Genin (at) dlr.deUNSPECIFIED
Haidn, O.DLR LampoldshausenUNSPECIFIED
Date:2009
Journal or Publication Title:Proceedings of the 45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, Denver, Colorado
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmail
UNSPECIFIEDwww.aiaa.org
Series Name:AIAA-2009-4854
Status:Published
Keywords:flow sepration, dual bell nozzle
Event Title:45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit
Event Location:Denver, Colorado, USA
Event Type:international Conference
Event Dates:2. - 5. Aug. 2009
Organizer:AIAA
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignment
DLR - Research area:Space
DLR - Program:W - no assignment
DLR - Research theme (Project):W - no assignment (old)
Location: Lampoldshausen
Institutes and Institutions:Institute of Space Propulsion > Technologie
Deposited By: Hanke, Michaela
Deposited On:09 Jan 2010 13:29
Last Modified:01 Dec 2018 19:47

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