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Experimental Study of Boundary-Layer Ingestion into a Diverterless S-Duct Intake

Rein, Martin and Koch, Stefan (2015) Experimental Study of Boundary-Layer Ingestion into a Diverterless S-Duct Intake. AIAA Journal, 53 (11), pp. 3487-3491. American Institute of Aeronautics and Astronautics (AIAA). doi: 10.2514/1.J053902. ISSN 0001-1452.

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Official URL: http://arc.aiaa.org/doi/pdf/10.2514/1.J053902


AN INGESTION of fluid of reduced velocity like that of wake flows and boundary layers can increase the efficiency of engines [1,2]. This is exploited with torpedoes, where the propulsion system is usually placed in the wake of the body. Recent studies [3–6] have shown that benefits resulting from an ingestion of boundary layers are also possible in the case of blended-wing bodies, with the distortion of the flow and reduced stagnation pressures at the engine face being the main problem. The topic of this Note is a parametric study of the combined effect on flowconditions at the engine face of boundary-layer ingestion into intakes and an S-duct diffuser. Previous studies used boundary layers formed on the walls of a wind tunnel [7]. In this study, a boundary layer of well-defined thickness is formed on a flat plate within the wind tunnel. The intake is placed at a certain distance from the leading edge of the plate. By changing the length of the plate, the boundary-layer thickness can be varied independently of other flow properties. Intake performance is assessed based on circumferential distortions and losses in total pressure at the aerodynamic interface plane (AIP). Experiments were performed in the cryogenic blowdown tunnel–Göttingen (DNW-KRG) of the German–Dutch Wind Tunnels. Impulse facilities like the DNW-KRG are well suited for intake tests. For example, air intake studies have been successfully performed in a light piston tunnel for which the test time is on the order of 1 s, similar to that of the DNW-KRG [8]. The blowdown tunnel DNW-KRG allows the variation of the Reynolds and Mach numbers, as well as boundary-layer thickness and mass flux through the intake independent of each other.

Item URL in elib:https://elib.dlr.de/99028/
Document Type:Article
Title:Experimental Study of Boundary-Layer Ingestion into a Diverterless S-Duct Intake
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Rein, Martinmartin.rein (at) dlr.deUNSPECIFIED
Koch, Stefanstefan.koch (at) dlr.deUNSPECIFIED
Journal or Publication Title:AIAA Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.2514/1.J053902
Page Range:pp. 3487-3491
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Series Name:Technical Notes
Keywords:intake, boundary layer ingestion, diverterless intake, s-duct
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Military Technologies (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > High Speed Configurations
Deposited By: Micknaus, Ilka
Deposited On:17 Nov 2015 14:45
Last Modified:08 Mar 2018 18:42

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