Selzer, Markus and Langener, Tobias and Hald, Hermann and von Wolfersdorf, Jens (2009) Production and Characterization of Porous C/C Material. Project Report. DLR . 11 S. (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/ | |||||||||||||||
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Document Type: | Monograph (Project Report) | |||||||||||||||
Title: | Production and Characterization of Porous C/C Material | |||||||||||||||
Authors: |
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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: |
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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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