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Numerical and Experimental Analysis of Rarefaction Effects on Aerodynamic Coefficients of a Slender Re-entry Vehicle

Hannemann, Klaus und Hepp, Christian und Winkler, Violetta und Hannemann, Volker und Schlegat, Thomas und Grabe, Martin (2018) Numerical and Experimental Analysis of Rarefaction Effects on Aerodynamic Coefficients of a Slender Re-entry Vehicle. In: International Conference on High-Speed Vehicle Science and Technology (HiSST). International Conference on High-Speed Vehicle Science and Technology (HiSST), 26.–29. November 2018, Moskau, Russland.

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Offizielle URL: https://events.tsagi.ru/en/hisst-2018/

Kurzfassung

The lift and drag coefficients for a slender re-entry configuration are measured in the near continuum transition regime from continuum to free molecular flow in the 2nd test section of the continuously operating Hypersonic Vacuum Wind Tunnels Göttingen (V2G) of the German Aerospace Center (DLR). In these tests the range of Knudsen numbers based on the wind tunnel model length is 7.2e-4 < Kn < 7.2e-3. Since numerical tools are widely used in the framework of re-entry and hypersonic transport vehicle design they must be capable of correctly accounting for rarefaction effects on the aerodynamic coefficients in case the vehicle will operate in the upper atmosphere. The present unique benchmark data is suitable to validate commonly used numerical design tools. Therefore, a study is conducted using a Direct Simulation Monte Carlo Method (DSMC) as well as a solver for continuum flows. The DSMC computations are performed using the open-source SPARTA code and inviscid and viscous flow solutions are obtained with the DLR TAU code. For the selected wind tunnel free stream conditions, the Euler solver is applied to compute the flow field in the continuum limit. The DSMC method is used to generate the reference solution for the near continuum and rarefied flow conditions as well as the solution for the free molecular limit. The Navier-Stokes solver is applied in two modes. The first refers to the standard setup for viscous flow computations using no-slip wall boundary conditions. In order to account for the slip flow which is expected to develop with increasing rarefaction effects, the second mode of the Navier-Stokes solver includes velocity and temperature slip condition according to Maxwell and Smoluchowski. With this set of numerical tools the experimental data can be used for code validation and to judge in how far the continuum flow solver is applicable for the accurate prediction of the aerodynamic vehicle performance. In general, very good agreement for the lift and drag coefficient and the aerodynamic efficiency, i.e., the lift/drag ratio is obtained between the measurements and the DSMC solutions for the complete range of flow conditions. The Navier-Stokes solver with no-slip boundary conditions can only be applied for the flow condition at the two lowest considered Knudsen numbers. The slip conditions slightly extend the range of applicability, however, for the highest Knudsen number flow, the DSMC method is required for accurate predictions. The simple slip flow conditions utilized here are not sufficient to match the DSMC results. Based on code to code comparisons, a similar result is obtained for the pitching moment coefficient.

elib-URL des Eintrags:https://elib.dlr.de/123370/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Numerical and Experimental Analysis of Rarefaction Effects on Aerodynamic Coefficients of a Slender Re-entry Vehicle
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Hannemann, Klausklaus.hannemann (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Hepp, ChristianChristian.Hepp (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Winkler, ViolettaVioletta.Winkler (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Hannemann, Volkervolker.hannemann (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Schlegat, ThomasThomas.Schlegat (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Grabe, Martinmartin.grabe (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:November 2018
Erschienen in:International Conference on High-Speed Vehicle Science and Technology (HiSST)
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:CFD, DSMC, ground based testing, hypersonic flow, aerodynamic coefficients
Veranstaltungstitel:International Conference on High-Speed Vehicle Science and Technology (HiSST)
Veranstaltungsort:Moskau, Russland
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:26.–29. November 2018
Veranstalter :CEAS, TsAGI
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Raumtransport
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R RP - Raumtransport
DLR - Teilgebiet (Projekt, Vorhaben):R - Wiederverwendbare Raumfahrtsysteme und Antriebstechnologie
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Raumfahrzeuge, GO
Hinterlegt von: Hannemann, Prof. Dr. Klaus
Hinterlegt am:26 Nov 2018 13:52
Letzte Änderung:26 Nov 2018 13:52

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