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Arc Jet Testing of CMC Samples with Transpiration Cooling

Reimer, Thomas and Esser, Burkard and Gülhan, Ali (2013) Arc Jet Testing of CMC Samples with Transpiration Cooling. In: 44th Thermophysics Conference. 44th AIAA Thermophysics Conference, 24.-27. Juni 2013, San Diego, USA.

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Abstract

High speed sustained atmospheric flight creates high thermal loads at the tip, leading edges, intake ramps or engine structures of a flight vehicle. However, sharp edges are mandatory for these vehicles in order to obtain the required aerodynamic performance. To provide technical solutions for these problems, the concept of using porous ceramic matrix composite (CMC) materials in combination with active cooling by transpiration was investigated. An arc jet test campaign was carried out to determine basic parameters in terms of minimum required coolant focusing on liquid water as the coolant media. The tests were stagnation tests on flat samples with a diameter of 50 mm. The front wall thickness was 8 mm. The tests were carried out in the L3K and L2K arc jet facilities of DLR Cologne at approximately 1 MW/m² heat load. Good results were achieved in terms of mass flow data for C/C samples. A number of tests could be carried out at low supply pressures and low mass flow. A medium value of the lower limit mass flow is 0.33 g/s at a pressure of 225 hPa which is equal to 0.152 kg/m²s. With aluminum oxide samples, a cold surface could also be maintained, however, it was not possible to establish a steady-state condition in terms of mass flow and supply pressure.

Item URL in elib:https://elib.dlr.de/87096/
Document Type:Conference or Workshop Item (Speech)
Title:Arc Jet Testing of CMC Samples with Transpiration Cooling
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Reimer, Thomasthomas.reimer (at) dlr.deUNSPECIFIED
Esser, BurkardBurkard.Esser (at) dlr.deUNSPECIFIED
Gülhan, AliAli.Guelhan (at) dlr.deUNSPECIFIED
Date:24 June 2013
Journal or Publication Title:44th Thermophysics Conference
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:arc jet, testing, CMC, transpiration, cooling, C/C, C/C-SiC
Event Title:44th AIAA Thermophysics Conference
Event Location:San Diego, USA
Event Type:international Conference
Event Dates:24.-27. Juni 2013
Organizer:AIAA
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Shefex III
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Space System Integration
Deposited By: Reimer, Thomas
Deposited On:14 Jan 2014 15:21
Last Modified:31 Jul 2019 19:44

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