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Viscous Effects and Truncation Effects in Axisymmetric Busemann SCRamjet Intakes

Flock, Andreas K and Gülhan, Ali (2015) Viscous Effects and Truncation Effects in Axisymmetric Busemann SCRamjet Intakes. 53rd Aerospace Sciences Meeting, 05.-09. Jan. 2015, Kissimmee, Florida, USA.

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While designing a Busemann intake, we encountered two main constraints: First, caused by the displacement of the boundary layer, the pressure levels in a Busemann intake were higher (40%) than the values predicted analytically; these effects were labeled viscous effects. Second, truncating the flow field also changed the properties of the classical Busemann flow; these effects were labeled truncation effects and we distinguished between truncating the intake at the leading edge and at the rear side. To take into account viscous effects, we calculated the boundary layer displacement thickness with an integral method and widened the inviscid Busemann contour. To quantify the leading edge truncation effect, an oblique shock at the leading edge was assumed, and also the intake contraction ratio was stretched. The change in flow properties during the rear side truncation was derived in a stream thrust analysis. We separately investigated the effects with Reynoldsaveraged Navier-Stokes and Euler simulations, respectively. After the viscous correction, the deviation between numerically and analytically calculated pressure levels was below 10%. When truncating at the leading edge, the numerically calculated pressure level was generally too low, while the temperature level was within 5% of the prediction. After stretching the contraction ratio, we were able to keep the pressure within 5% of the design value, however in this case, the temperatures were generally too high. The stream thrust approach was highly accurate and for rear side truncated intakes we were able to predict the numerical pressure and temperature levels within 1% of the design values.

Item URL in elib:https://elib.dlr.de/97939/
Document Type:Conference or Workshop Item (Speech)
Title:Viscous Effects and Truncation Effects in Axisymmetric Busemann SCRamjet Intakes
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Flock, Andreas Kandreas.flock (at) dlr.deUNSPECIFIED
Gülhan, AliAli.Guelhan (at) dlr.deUNSPECIFIED
Date:January 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-15
Keywords:SCRamjet, Busemann Intake, Hypersonics, Airbreathing Propulsion
Event Title:53rd Aerospace Sciences Meeting
Event Location:Kissimmee, Florida, USA
Event Type:international Conference
Event Dates:05.-09. Jan. 2015
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: Köln-Porz
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Über- und Hyperschalltechnologien
Deposited By: Flock, Andreas
Deposited On:31 Aug 2015 10:26
Last Modified:29 Mar 2017 13:15

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