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Influence of active cooling on second mode instabilities investigated on hypersonic, conical flows

Wartemann, Viola and Ponchio Camillo, Giannino and Reiter, Philipp and Neumann, Jens and Wagner, Alexander (2018) Influence of active cooling on second mode instabilities investigated on hypersonic, conical flows. HiSST: International Conference on High-Speed Vehicle Science Technology, 26. - 29. Nov. 2018, Moskau.

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Abstract

In the present study the influence of active cooling on hypersonic boundary layer transition is investigated. The analyses are carried out on a 7° half angle, blunted cone with different nose radii and various gas injection mass flow rates. At the considered free stream conditions second mode waves are the dominant boundary layer instabilities, which are consequently the focus of this stufy. The stability analyses are performed by means of the stability code NOLOT, NOnLOcal Transition analysis, of the German Aerospace Center (DLR). The influence of mass injection on the frequencies and growth rates of the second modes is analyzed in detail. The effect on the transition onset locations are discussed. The numerical predictions are compared with experimental results. The experimental data referred to in the present study were obtained in the DLR High Enthalpy Shock Tunnel Göttingen (HEG).

Item URL in elib:https://elib.dlr.de/124069/
Document Type:Conference or Workshop Item (Speech)
Title:Influence of active cooling on second mode instabilities investigated on hypersonic, conical flows
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wartemann, ViolaViola.Wartemann (at) dlr.deUNSPECIFIED
Ponchio Camillo, GianninoGiannino.PonchioCamillo (at) dlr.deUNSPECIFIED
Reiter, Philippphilipp.reiter (at) tu-braunschweig.deUNSPECIFIED
Neumann, Jensje.neumann (at) tu-braunschweig.deUNSPECIFIED
Wagner, AlexanderAlexander.Wagner (at) dlr.deUNSPECIFIED
Date:November 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:second mode, NOLOT, active cooling, cone, HEG
Event Title:HiSST: International Conference on High-Speed Vehicle Science Technology
Event Location:Moskau
Event Type:international Conference
Event Dates:26. - 29. Nov. 2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Shefex III, Re-usability Flight Experiment (ReFEx)
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:12 Dec 2018 10:02
Last Modified:12 Dec 2018 10:02

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