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Experimental Investigation of a Two-Dimensional and a Three-Dimensional Scramjet Inlet at Mach 7

Häberle, Jürgen and Gülhan, Ali (2008) Experimental Investigation of a Two-Dimensional and a Three-Dimensional Scramjet Inlet at Mach 7. Journal of Propulsion and Power, 24 (5), pp. 1023-1034.

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The current experimental study at Mach 7 was carried out to investigate the viscous flow effects in a scramjet inlet with a fixed geometry operating at Mach 7.5-8. To reduce the risk of inlet unstart, an optional passive boundary-layer bleed was integrated at the throat and tested for different bleed dimensions. The passive bleed significantly reduces the lip-shock-induced separation bubble on the ramp. But the correct location of the bleed gap is important for the reduction of the separation bubble. To investigate the compression behavior, different backpressures were applied and the effects on the internal flow structure were analyzed by means of static pressure along the isolator and pitot pressure profiles at the exit of the isolator. Because the reference configuration has a very small internal contraction ratio to guarantee self-starting, the internal compression ratio was increased in three steps by means of additional sidewall compression along the internal flowpath. This includes internal contraction ratios above the starting limit. This measure led to a significant increase of the static pressure ratio at the end of the isolator. The complex flow structures are explained by means of detailed static and pitot pressure plots.

Item URL in elib:https://elib.dlr.de/55456/
Document Type:Article
Title:Experimental Investigation of a Two-Dimensional and a Three-Dimensional Scramjet Inlet at Mach 7
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Häberle, JürgenEADS MünchenUNSPECIFIED
Date:September 2008
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
Page Range:pp. 1023-1034
Keywords:Scram-jet, inlet, aerothermal phenomena, hypersonic windtunnel H2K
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 - Grundlagen Raumtransport - Anlagen und Messtechnik (old)
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology
Deposited On:06 Oct 2008
Last Modified:27 Apr 2009 15:15

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