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Research Papers: Gas Turbines: Ceramics

On the Performance of Porous Sound Absorbent Material in High Temperature Applications

[+] Author and Article Information
Frank Giese, Hans-Christoph Ries, Christian Eigenbrod

Department of Propulsion and Power Systems, ZARM, University of Bremen, 28359 Bremen, Germany

J. Eng. Gas Turbines Power 132(12), 121301 (Aug 25, 2010) (6 pages) doi:10.1115/1.4001823 History: Received April 08, 2010; Revised April 09, 2010; Published August 25, 2010; Online August 25, 2010

This paper discusses the use of novel porous sound absorbent ceramic tiles as heat shields in combustion chambers with respect to their sound absorption. For this purpose, a theory describing the bulk properties of a homogeneous porous absorber layer was combined with a transfer matrix approach to account for the temperature gradient within the absorber. By means of a high temperature scenario, the maximum absorption performance and the required microscale properties of the absorber are presented.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Block diagram of influencing variables for determination of the absorption coefficient of layered sound absorbers

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Figure 2

High temperature scenario of an absorption layer: trend of temperature and its influence on the (normalized) gas properties

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Figure 3

Sensitivity of the THM for the structural factor for Ξ=63 kPa s/m2, p=1 bar, T=300, and σ=0.7

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Figure 4

Sound absorption spectrum, experimental data and prediction with THM

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Figure 5

Prediction of the maximum reachable absorption coefficient and corresponding flow resistance for different pressures at T=300 K, σ=0.7, and χ=6

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Figure 6

Prediction of the maximum reachable absorption coefficient and corresponding flow resistance for different temperatures, σ=0.7, and χ=6

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Figure 7

Absolute deviation of the absorption coefficient for various numbers of layers in comparison to five layers

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Figure 8

Prediction of the maximum reachable absorption coefficient and corresponding flow resistance for a high temperature scenario for different porosities and χ=6

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