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Cold Gas Testing of Thrust-Optimized Parabolic Nozzle in a High-Altitude Test Facility

Haidn, Oskar and Verma, S. (2011) Cold Gas Testing of Thrust-Optimized Parabolic Nozzle in a High-Altitude Test Facility. Journal of Propulsion and Power, Vol. 27 (No. 6). American Institute of Aeronautics and Astronautics (AIAA). doi: 10.2514/1.B34320.

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An experimental investigation has been carried out to study the changes in the exhaust flow development of a thrust-optimized parabolic nozzle when it is tested in two different test environments, namely, under sea-level conditions and in a low-pressure environment inside a high-altitude test facility. For tests inside the high-altitude simulation chamber, the incipient separation location is found to be located considerably upstream relative to its location under sea-level tests. Furthermore, it is also observed that the location of normal shock for tests inside the high-altitude chamber is slightly downstream of its position in sea-level tests. These flow modifications shift the momentum imbalance along the overexpansion and reflected shocks in such a way that only free shock separation condition is favored (both during startup and shutdown transients) for all test conditions inside the high-altitude facility. As a result, flow transitions such as free shock separation to restricted-shock separation and vice versa, observed in the present tests under sea-level conditions, are not at all observed for tests inside the high-altitude test facility. The primary cause responsible for such a discrepancy in the observed flow conditions is the significantly reduced mass flow or density of the test gas [due to the lower driving pressure (P 0) required to achieve similar nozzle pressure ratio] inside the high-altitude chamber. The reduced mass flow also prevents the gas to nucleate earlier, and hence delays the onset of nitrogen condensation to a much higher nozzle pressure ratio.

Item URL in elib:https://elib.dlr.de/72137/
Document Type:Article
Title:Cold Gas Testing of Thrust-Optimized Parabolic Nozzle in a High-Altitude Test Facility
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Haidn, OskarOskar.Haidn (at) dlr.deUNSPECIFIED
Verma, S.NAL Bangalore, IndiaUNSPECIFIED
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
Volume:Vol. 27
DOI :10.2514/1.B34320
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Keywords:parabolic nozzle, rocket combustion
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: Hanke, Michaela
Deposited On:30 Nov 2011 12:43
Last Modified:01 Dec 2018 19:47

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