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Production and Characterization of Porous C/C Material

Selzer, Markus and Langener, Tobias and Hald, Hermann and von Wolfersdorf, Jens (2009) Production and Characterization of Porous C/C Material. Project Report. (In Press)

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Abstract

In todays rocket combustion chambers extremely high heat loads are apparent. Reducing these loads in combination with a weight reduction of the thrust chambers structural weight can be achieved with transpiration cooling applied to composite carbon/carbon materials (C/C). In the SFB-TRR 40, subproject A5, evaluating this cooling technique is being the set goal. This paper presents the manufacturing process and the material specific characterization. First, the liquid silicon infiltration process (LSI) is being outlined, followed by the description of techniques used for the determination of the open porosity (ε) and the Darcian (Kd) and Forchheimer (Kf ) permeability coefficients of these composites. Last are important design parameters, yielding the pressure drop for a certain coolant mass-flow rate. For the porosity, the archimedes principle was applied. The typical porosity of C/C ranges from ε = 8 % up to ε = 13 %. Kd and Kf were determined by measuring the pressure drop for a set mass-flow rate through a material specimen. From this data, using a least-square fitting technique, the permeability coefficients can be derived. For C/C Kd typically lies in the order of 10−13 and Kf normally in the order of 10−8.

Item URL in elib:https://elib.dlr.de/60899/
Document Type:Monograph (Project Report)
Title:Production and Characterization of Porous C/C Material
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Selzer, MarkusIBK / DLRUNSPECIFIED
Langener, TobiasITLR / Universität StuttgartUNSPECIFIED
Hald, HermannIBK / DLRUNSPECIFIED
von Wolfersdorf, JensITLR / Universität StuttgartUNSPECIFIED
Date:November 2009
Journal or Publication Title:Sonderforschungsbereich Transregio 40 – Annual Report 2009
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:11
Editors:
EditorsEmail
Lehrstuhl für Aerodynamik, TU München
Status:In Press
Keywords:C/C, Transpirationskühlung, Porosität, Permeabilität
Institution:DLR
Department:Institut für Bauweisen und Konstruktionsforschung, Abteilung RSI
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignment
DLR - Research area:Space
DLR - Program:W - no assignment
DLR - Research theme (Project):W - no assignment (old)
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Space Structural Components
Deposited By: Selzer, Markus
Deposited On:03 Dec 2009 10:36
Last Modified:03 Dec 2009 10:36

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