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Measurements of surface exhalation characteristics of porous fibre reinforced composites.

Selzer, Markus and Hald, Hermann and Schweikert, Sven and Wolfersdorf, Jens von (2012) Measurements of surface exhalation characteristics of porous fibre reinforced composites. 4th International Conference on Porous Media and its Applications in Science and Engineering, 17.-22. Jun. 2012, Potsdam, Deutschland.

Full text not available from this repository.

Abstract

Rocket combustion chambers are subject to extremely high thermal loads. To protect the chamber walls from these loads, an efficient cooling is necessary. As a highly effective cooling mechanism, transpiration cooling promises advantages over conventional regenerative and active cooling techniques like film cooling. In combination with porous ceramic matrix composites (CMC), longer durability due to low coefficient of thermal expansion, lower manufacturing costs and possible weight reductions are possible, all while retaining the performance of regenerative cooled combustion chambers. One parameter determining the effectiveness of this cooling mechanism, is the exhalation characteristic of the coolant from the porous surface. Measurements of this characteristic are shown for a carbon fibre reinforced carbon (C/C) and single free jets. For C/C it is shown, that possible defects like blocked pores or delaminations can be detected by measuring the dynamic pressure of the outflow. Furthermore, it is shown, that the exhalation characteristic for C/C is dependent on the through flow direction. The derivation of mass flow through the sample from these measurements reveals an quantitative overestimation of the velocity distribution. By simulating the measurement, it is shown, that one important aspect is the spatial integration of the measured values over the sensor area. But it is also shown, that this effect is not enough to explain the overestimation and additional effects need to be considered.

Item URL in elib:https://elib.dlr.de/77107/
Document Type:Conference or Workshop Item (Paper, Poster)
Title:Measurements of surface exhalation characteristics of porous fibre reinforced composites.
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Selzer, MarkusUNSPECIFIEDUNSPECIFIED
Hald, HermannUNSPECIFIEDUNSPECIFIED
Schweikert, SvenUniversität StuttgartUNSPECIFIED
Wolfersdorf, Jens vonUniversität StuttgartUNSPECIFIED
Date:June 2012
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:poröse Medien, CMC, Transpirationskühlung
Event Title:4th International Conference on Porous Media and its Applications in Science and Engineering
Event Location:Potsdam, Deutschland
Event Type:international Conference
Event Dates:17.-22. Jun. 2012
Organizer:Engineering Conferences International
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:other
DLR - Research area:Raumfahrt
DLR - Program:R - no assignment
DLR - Research theme (Project):R - no assignment
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Space Structural Components
Deposited By: Selzer, Markus
Deposited On:15 Oct 2012 09:44
Last Modified:15 Oct 2012 09:44

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