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Materials 2015, 8(7), 4004-4021; doi:10.3390/ma8074004

Experimental and Numerical Study on Effect of Sample Orientation on Auto-Ignition and Piloted Ignition of Poly(methyl methacrylate)

1
State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, Anhui, China
2
Collaborative Innovation Center for Urban Public Safety, 96 Jinzhai Road, Hefei 230026, Anhui, China
*
Author to whom correspondence should be addressed.
Academic Editor: Rodolphe Sonnier
Received: 23 May 2015 / Revised: 21 June 2015 / Accepted: 29 June 2015 / Published: 2 July 2015

Abstract

In this work, the effect of seven different sample orientations from 0° to 90° on pilot and non-pilot ignition of PMMA (poly(methyl methacrylate)) exposed to radiation has been studied with experimental and numerical methods. Some new and significant conclusions are drawn from the study, including a U-shape curve of ignition time and critical mass flux as sample angle increases for pilot ignition conditions. However, in auto-ignition, the ignition time and critical mass flux increases with sample angle α. Furthermore, a computational fluid dynamic model have been built based on the Fire Dynamics Simulator (FDS6) code to investigate the mechanisms controlling the dependence on sample orientation of the ignition of PMMA under external radiant heating. The results of theoretical analysis and modeling results indicate the decrease of total incident heat flux at sample surface plays the dominant role during the ignition processes of auto-ignition, but the volatiles gas flow has greater influence for piloted ignition conditions. View Full-Text
Keywords: orientation; piloted ignition; auto-ignition; critical mass flux orientation; piloted ignition; auto-ignition; critical mass flux
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Peng, F.; Zhou, X.-D.; Zhao, K.; Wu, Z.-B.; Yang, L.-Z. Experimental and Numerical Study on Effect of Sample Orientation on Auto-Ignition and Piloted Ignition of Poly(methyl methacrylate). Materials 2015, 8, 4004-4021.

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