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Experimentelle und theoretische Untersuchungen zur Instabiliaet und Transition in Hyperschallstroemungen

Wendt, V. and Simen, M. (1993) Experimentelle und theoretische Untersuchungen zur Instabiliaet und Transition in Hyperschallstroemungen. 6. STAB-Workshop, 10.-12. Nov. 1993, Goettingen.

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Abstract

As part of an investigation on hypersonic boundary layer transition, first successful hot-wire and fluctuating pressure measurements have been conducted in the Ludwieg-Tube facility of DLR at Mach number M infinity &#61 5. The disturbance amplitudes (rms-values) of the fluctuations of Pitot pressure and mass flow are smaller than the values measured in conventional, i.e. continuously driven or blowdown type, hypersonic wind-tunnel. Hot-wire measurements in the laminar boundary layer on a flat plate and on a cone in the same wind tunnel at Mach 5 did not show the expected dominance of high-frequency second mode instabilities, as presdicted by linear stability theory and found in other experiments. However, the growth of natural disturbances within a broad frequency band up to 50 kHz could be observed on the flat plate. The measured amplification ratesare in good agreement with theoretical results for three dimensional first mode disturbances.

Document Type:Conference or Workshop Item (Speech)
Additional Information: LIDO-Berichtsjahr=1993,
Title:Experimentelle und theoretische Untersuchungen zur Instabiliaet und Transition in Hyperschallstroemungen
Authors:
AuthorsInstitution or Email of Authors
Wendt, V.UNSPECIFIED
Simen, M.UNSPECIFIED
Date:1993
Status:Published
Keywords:Hitzdrahtmesstechnik, Druckmesstechnik, Hyperschall, Rohrwindkanal, Transition, Instabilitaet, Stroemungsqualitaet
Event Title:6. STAB-Workshop, 10.-12. Nov. 1993, Goettingen
HGF - Research field:UNSPECIFIED
HGF - Program:Space (old)
HGF - Program Themes:W RP - Raumtransport
DLR - Research area:UNSPECIFIED
DLR - Program:W RP - Raumtransport
DLR - Research theme (Project):UNSPECIFIED
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Strömungsmechanik > Institut für Experimentelle Strömungsmechanik
Deposited By: elib DLR-Beauftragter
Deposited On:03 Apr 2006
Last Modified:27 Apr 2009 10:07

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