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Open AccessArticle

Numerical Study of the Comparison of Symmetrical and Asymmetrical Eddy-Generation Scheme on the Fire Whirl Formulation and Evolution

1
School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, NSW 2052, Australia
2
School of Mechanical and Automotive Engineering, RMIT University, Melbourne, VIC 3000, Australia
3
Australian Nuclear Science and Technology Organisation (ANSTO), Locked Bag 2001, Kirrawee DC, NSW 2232, Australia
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(1), 318; https://doi.org/10.3390/app10010318
Received: 30 November 2019 / Revised: 26 December 2019 / Accepted: 28 December 2019 / Published: 1 January 2020
(This article belongs to the Special Issue Progress in Combustion Diagnostics, Science and Technology)
A numerical study of the fire whirl formation under symmetrical and asymmetrical entraining configuration is presented. This work aims to assess the effect of eddy-generation configuration on the evolution of the intriguing phenomenon coupled with both flow dynamics and combustion. The numerical framework implements large-eddy simulation, detailed chemistry to capture the sophisticated turbulence-chemistry interaction under reasonable computational cost. It also adopts liquid-based clean fuel with fixed injection rate and uniformed discretisation scheme to eliminate potential interference introduced by various aspects of uncertainties. The result reveals that the nascent fire whirl formulates significantly rapidly under the symmetrical two-slit configuration, with extended flame height and constrained vortex structure, compared with the asymmetrical baseline. However, its revolution orbit gradually diverges from domain centreline and eventually stabilises with a large radius of rotation, whereas the revolution pattern of that from the baseline case is relatively unchanged from the inception of nascent fire whirl. Through the analysis, the observed difference in evaluation pathway could be explained using the concept of circular motion with constant centripetal force. This methodology showcases its feasibility to reveal and visualise the fundamental insight and facilitate profound understanding of the flaming behaviour to benefit both research and industrial sectors. View Full-Text
Keywords: fire whirl; computational fluid dynamics; eddy-generation mechanism; combustion modelling; detailed chemistry; large eddy simulation fire whirl; computational fluid dynamics; eddy-generation mechanism; combustion modelling; detailed chemistry; large eddy simulation
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Wang, C.; Yuen, A.C.Y.; Chan, Q.N.; Chen, T.B.Y.; Yip, H.L.; Cheung, S. .-P.; Kook, S.; Yeoh, G.H. Numerical Study of the Comparison of Symmetrical and Asymmetrical Eddy-Generation Scheme on the Fire Whirl Formulation and Evolution. Appl. Sci. 2020, 10, 318.

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