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Side Loads in Sub-scale Dual Bell Nozzles

Génin, Chloé and Stark, Ralf (2011) Side Loads in Sub-scale Dual Bell Nozzles. Journal of Propulsion and Power (27), pp. 828-837. American Institute of Aeronautics and Astronautics (AIAA). doi: 10.25141/1.B34170.

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The contour inflection of the dual bell nozzle forces the flow to a symmetrical and controlled separation in sea level mode. At a certain altitude, the transition to high altitude mode takes place: the flow attaches rapidly to the nozzle extension wall, down to the exit plane. During this transition, the separation point moves in the extension generating potential high side load peaks due to its asymmetrical position. A cold flow subscale test campaign has been conducted on three nozzle models at the German Aerospace Center to evaluate the generation of side loads in dual bell nozzles. The phenomenology is given for the different nozzle flow regimes. Both operating modes are related to very low side loads. Transition and retransition induce a strong short time peak. The phase of sneak transition, corresponding to a flow separation within the inflection region before the start of the actual transition, generates comparable side loads to separated conventional nozzles. The influence of the various geometrical parameters on flow behavior and side load generation was also investigated in this study. The extension length is shown to be the critical parameter for flow stability, transition duration and side load generation, leading to the necessity of a trade off for the optimization of the dual bell concept in rocket applications.

Item URL in elib:https://elib.dlr.de/70893/
Document Type:Article
Title:Side Loads in Sub-scale Dual Bell Nozzles
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Génin, Chloéchloe.genin (at) dlr.deUNSPECIFIED
Stark, RalfRalf.Stark (at) dlr.deUNSPECIFIED
Date:July 2011
Journal or Publication Title:Journal of Propulsion and Power
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.25141/1.B34170
Page Range:pp. 828-837
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Keywords:Side loads, Dual Bell, Nozzle
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:other
DLR - Research area:Raumfahrt
DLR - Program:R - no assignment
DLR - Research theme (Project):R - no assignment
Location: Lampoldshausen
Institutes and Institutions:Institute of Space Propulsion > Technologie
Deposited By: Nürnberger-Genin, Chloe
Deposited On:07 Oct 2011 09:34
Last Modified:08 Mar 2018 18:44

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