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Influence of the test environment on the transition of dual-bell nozzles

Génin, Chloé and Stark, Ralf (2011) Influence of the test environment on the transition of dual-bell nozzles. 28th International Symposium on Space Technology and Science (ISTS), 5. - 12. Juni 2011, Okinawa, Japan.

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Abstract

The dual bell nozzle offers a simple and efficient altitude adaption through its contour inflection, which insures symmetrical and controlled separation at sea level and a large area ratio at high altitude. The understanding of the transition from one operating mode to the other is the key to its prediction. Intensive cold flow investigation has led to an empirical criterion for a precise transition prediction. However, the testing conditions may have a great influence on the actual transition. The temperature of the flow and the nozzle wall, especially when driving test series, can shift the nozzle pressure ratio leading to the transition. A test campaign in a high altitude chamber has also shown the dependence of the transition condition with the chamber pressure, i.e. with the density of the separated backflow. For a reliable prediction of the dual-bell nozzle flow behavior, both on test facility and in real flight conditions, all these influences have to be identified and taken into account.

Item URL in elib:https://elib.dlr.de/70892/
Document Type:Conference or Workshop Item (Paper)
Title:Influence of the test environment on the transition of dual-bell nozzles
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Génin, Chloéchloe.genin (at) dlr.deUNSPECIFIED
Stark, Ralfralf.stark (at) dlr.deUNSPECIFIED
Date:June 2011
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Keywords:Dual-Bell, Transition
Event Title:28th International Symposium on Space Technology and Science (ISTS)
Event Location:Okinawa, Japan
Event Type:international Conference
Event Dates:5. - 12. Juni 2011
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 09:35
Last Modified:23 Jan 2012 11:15

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