Temperature jump phenomenon during plasmatron testing of ZrB 2-SiC ultrahigh-temperature ceramics

Jochen Marschall; Dušan A. Pejaković; William G. Fahrenholtz; Greg E. Hilmas; Francesco Panerai; Olivier Chazot

doi:10.2514/1.T3798

Temperature jump phenomenon during plasmatron testing of ZrB ₂-SiC ultrahigh-temperature ceramics

Jochen Marschall, Dušan A. Pejaković, William G. Fahrenholtz, Greg E. Hilmas, Francesco Panerai, Olivier Chazot

Research output: Contribution to journal › Article › peer-review

Abstract

The performance of ZrB₂-SiC ultrahigh-temperature ceramics in subsonic high-enthalpy dissociated airflows was investigated in the 1.2MWPlasmatron facility at the von Karman Institute for Fluid Dynamics. Samples were sequentially exposed to low and high heat flux conditions during a single test run. Under certain high heat flux conditions, a rapid and spontaneous rise in sample surface temperature was observed under constant freestream conditions. The temperature jump seems associated with a transition in surface chemistry that leads to the loss of protective silica glass and substantially increases the chemical component of heat flux delivered to the surface.

Original language	English (US)
Pages (from-to)	559-572
Number of pages	14
Journal	Journal of thermophysics and heat transfer
Volume	26
Issue number	4
DOIs	https://doi.org/10.2514/1.T3798
State	Published - 2012
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics
Aerospace Engineering
Mechanical Engineering
Fluid Flow and Transfer Processes
Space and Planetary Science

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10.2514/1.T3798

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title = "Temperature jump phenomenon during plasmatron testing of ZrB 2-SiC ultrahigh-temperature ceramics",

abstract = "The performance of ZrB2-SiC ultrahigh-temperature ceramics in subsonic high-enthalpy dissociated airflows was investigated in the 1.2MWPlasmatron facility at the von Karman Institute for Fluid Dynamics. Samples were sequentially exposed to low and high heat flux conditions during a single test run. Under certain high heat flux conditions, a rapid and spontaneous rise in sample surface temperature was observed under constant freestream conditions. The temperature jump seems associated with a transition in surface chemistry that leads to the loss of protective silica glass and substantially increases the chemical component of heat flux delivered to the surface.",

author = "Jochen Marschall and Pejakovi{\'c}, {Du{\v s}an A.} and Fahrenholtz, {William G.} and Hilmas, {Greg E.} and Francesco Panerai and Olivier Chazot",

year = "2012",

doi = "10.2514/1.T3798",

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publisher = "American Institute of Aeronautics and Astronautics Inc. (AIAA)",

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AU - Marschall, Jochen

AU - Pejaković, Dušan A.

AU - Fahrenholtz, William G.

AU - Hilmas, Greg E.

AU - Panerai, Francesco

AU - Chazot, Olivier

PY - 2012

Y1 - 2012

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AB - The performance of ZrB2-SiC ultrahigh-temperature ceramics in subsonic high-enthalpy dissociated airflows was investigated in the 1.2MWPlasmatron facility at the von Karman Institute for Fluid Dynamics. Samples were sequentially exposed to low and high heat flux conditions during a single test run. Under certain high heat flux conditions, a rapid and spontaneous rise in sample surface temperature was observed under constant freestream conditions. The temperature jump seems associated with a transition in surface chemistry that leads to the loss of protective silica glass and substantially increases the chemical component of heat flux delivered to the surface.

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