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Influence of transpiration 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 (2019) Influence of transpiration cooling on second mode instabilities investigated on hypersonic, conical flows. CEAS Space Journal, 11 (3). Springer. DOI: 10.1007/s12567-019-00249-9 ISSN 1868-2502

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Official URL: https://doi.org/10.1007/s12567-019-00249-9

Abstract

In the present study the influence of active cooling on hypersonic boundary layer transition at different Mach numbers, from 7 up to 10, 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. In all cases low mass fluxes, which do not inducing visible shocks in the schlieren images, are applied. 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 means of the stability code NOLOT, NOnLOcal Transition analysis, of the German Aerospace Center (DLR). The influence of different 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/127293/
Document Type:Article
Additional Information:Print ISSN 1868-2502 Online ISSN 1868-2510
Title:Influence of transpiration 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, PhilippUNSPECIFIEDUNSPECIFIED
Neumann, JensUNSPECIFIEDUNSPECIFIED
Wagner, AlexanderAlexander.Wagner (at) dlr.deUNSPECIFIED
Date:18 May 2019
Journal or Publication Title:CEAS Space Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:11
DOI :10.1007/s12567-019-00249-9
Publisher:Springer
ISSN:1868-2502
Status:Published
Keywords:stability analyses, second mode instability, Transpiration cooling, mass injection, cone, NOLOT, HEG
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
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:09 Sep 2019 08:53
Last Modified:09 Sep 2019 08:53

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