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Stability analyses of hypersonic, conical flows with transpiration cooling

Wartemann, Viola and Ponchio Camillo, Giannino and Wagner, Alexander and Neumann, Jens and Weber, Alexander (2019) Stability analyses of hypersonic, conical flows with transpiration cooling. IUTAM Symposium on Laminar Turbulent Transition, 2. - 6.9.2019, London, Großbritanien.

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The influence of transpiration cooling on second modes is analyzed in the present study. The investigations are carried out on a 7° half angle, blunted cone with a nose radius of 5 mm. At a free stream Mach number of 7, various gas injection mass flow rates are applied. The goal is to have the cooling effect, without triggering the transition. Thus the investigations focused on low mass fluxes. As injection gas nitrogen is used. At the considered free stream conditions second modes are the dominant boundary-layer instabilities, which are consequently the focus of this study. The stability analyses are performed by the stability code NOLOT, NOnLOcal Transition analysis, of the German Aerospace Center (DLR). Beside the analyses of the influence of different mass injection on the frequencies and growth rates of the second modes and finally on the transition onset itself, different stability approaches are applied: Calculations based on Linear Stability Theory (LST) are compared against Parabolized-Stability-Equations (PSE) results. The numerical predictions are compared with experimental data, which were obtained in the DLR High Enthalpy Shock Tunnel G ̈ottingen (HEG).

Item URL in elib:https://elib.dlr.de/129103/
Document Type:Conference or Workshop Item (Speech)
Title:Stability analyses of hypersonic, conical flows with transpiration cooling
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Wartemann, ViolaViola.Wartemann (at) dlr.deUNSPECIFIED
Ponchio Camillo, GianninoGiannino.PonchioCamillo (at) dlr.deUNSPECIFIED
Wagner, AlexanderAlexander.Wagner (at) dlr.deUNSPECIFIED
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Transpiration cooling; Conical, hypersonic boundary-layer transition; Second mode instability; Stability analysis; Linear Stability Theory (LST); Parabolized Stability Equations (PSE); High Enthalpy Shock Tunnel G ̈ottingen (HEG)
Event Title:IUTAM Symposium on Laminar Turbulent Transition
Event Location:London, Großbritanien
Event Type:international Conference
Event Dates:2. - 6.9.2019
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transportation
DLR - Research area:Raumfahrt
DLR - Program:R RP - Space Transportation
DLR - Research theme (Project):R - Shefex III (old)
Location: Braunschweig , Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Spacecraft, BS
Institute for Aerodynamics and Flow Technology > Spacecraft, GO
Deposited By: Wartemann, Viola
Deposited On:23 Oct 2019 14:04
Last Modified:24 Jan 2020 13:13

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