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Experimental Study of Flow Behaviour and Thermal loads in Dual Bell Nozzles

Génin, Chloé (2010) Experimental Study of Flow Behaviour and Thermal loads in Dual Bell Nozzles. Dissertation, Université de Valenciennes.

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Abstract

The nozzle are currently presenting the most promising optimisation possibilities to supply the increasing needs of the aerospace industry. The dual bell nozzles allow the altitude adaptation of the flow. The inflection forces the flow to a stable and symmetrical separation, generating an optimised thrust for sea level operation. During the flight, when the ambient pressure decreases under a certain value, the flow suddenly attaches the nozzle wall down to the nozzle end, generating a higher expansion for higher performance. The study presented in this document was made at the DLR (German Aerospace Center) as part of a PhD. This fundamental study has for objective the understanding of the flow behaviour in a dual bell nozzle, in order to define the various parameters of influence. A cold flow test series has been conducted on various nozzle geometries. Pressure measurements have been made and the flow has been observed with schlieren optics in order to determine the influence of the geometry on the evolution of the flow transition from one operating mode to the other, its duration and stability toward pressure variations. Temperature and pressure measurements were also made during a test series under warm gas conditions to investigate the thermal load in the vicinity of the wall inflection.

Document Type:Thesis (Dissertation)
Additional Information:Dissertation
Title:Experimental Study of Flow Behaviour and Thermal loads in Dual Bell Nozzles
Authors:
AuthorsInstitution or Email of Authors
Génin, ChloéChloe.Nuernberger-Genin@dlr.de
Date:2010
Number of Pages:143
Publisher:Shaker Verlag
ISBN:978-3-8322-9230-0
Status:Published
Keywords:nozzle flow, dual bell, flow separation control, altitude adaption
Institution:Université de Valenciennes
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 - Schubkammertechnologie und Hochdruckverbrennung (old)
Location: Lampoldshausen
Institutes and Institutions:Institute of Space Propulsion > Technologie
Deposited By: Chloe Nürnberger-Genin
Deposited On:16 Dec 2010 12:22
Last Modified:16 Dec 2010 12:22

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