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Research Papers: Combustion and Reactive Flows

Real-Time Evaluation of Severe Heat Load Over Moving Interface of Decomposing Composites

[+] Author and Article Information
Hamid Mohammadiun, Mohammad Mohammadiun

 Department of Mechanical Engineering, Islamic Azad University, Shahrood Branch, Shahrood, 36146-16794, Iran

Hosein Molavi1

 Department of Mechanical Engineering, Tarbiat Modares University, Tehran, 14115-143, Iranhn.molavi@gmail.com

Hamid Reza Talesh Bahrami

 Department of Mechanical Engineering, Iran University of Science and Technology, Tehran, 16846-13114, Iranh_tbahrami@yahoo.com

1

Corresponding author.

J. Heat Transfer 134(11), 111202 (Sep 28, 2012) (7 pages) doi:10.1115/1.4007133 History: Received September 08, 2011; Revised May 13, 2012; Published September 26, 2012; Online September 28, 2012

Decomposing composites undergo both surface removal and in-depth decomposition, when they are subjected to severe heating environments. As a result, the gas phase and the chemical species are injected into the boundary layer, resulting in a reduction of the heat flux entering into the solid structure. Under such conditions that geometry changes, the reconstruction of heat flux at the ablating front is quite complicated. Utilizing a procedure based on the sequential function specification method, an inverse problem is solved to anticipate the front-surface heating condition. Temperature measurements as well as measurement of the position of the ablating surface accompanied with additive noises are used for the implementation of the current procedure. Taking into account a complex set of phenomena, a numerical experiment is employed to examine the accuracy and appropriateness of the proposed technique for such problems. The results obtained demonstrate the usefulness and efficiency of the proposed method for the estimation of heat flux at the moving boundary of decomposing materials.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the problem

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Figure 2

The surface recession as a function of time

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Figure 3

Theoretical profile of heat flux

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Figure 4

Temperature distribution along the material at various times

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Figure 5

Density variation along the material at various times

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Figure 6

Simulated measured temperatures at sensors position

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Figure 7

The theoretical and estimated profile of heat flux using noise-free data

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Figure 8

The theoretical and estimated profile of heat flux using noisy data (temperatures)

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Figure 9

The theoretical and used values of surface recession rate

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Figure 10

The theoretical and estimated profile of heat flux using noisy measured positions

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Figure 11

The theoretical and estimated profile of heat flux using noisy data (i.e., temperatures and positions)

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