Dynamic flame behaviour in a straight and 90-degree bend pipe for premixed hydrogen/air and methane/air flame propagation

Flame propagation inside a pipe is a complex phenomenon[1]. Worst, the fundamental issues on the physical and dynamic flame behaviour such as flame acceleration, pressure waves and flow turbulence are still unclear[2]. This paper reports on the experimental and numerical analyses towards understandi...

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Main Authors:	Siti Zubaidah, Sulaiman, R. M., Kasmani, A., Mustafa, Sina Davazdah, Emami
Format:	Conference or Workshop Item
Language:	English English
Published:	2019
Subjects:	TP Chemical technology
Online Access:	http://umpir.ump.edu.my/id/eprint/25689/ http://umpir.ump.edu.my/id/eprint/25689/1/41.%20Dynamic%20flame%20behaviour%20in%20a%20straight%20and%2090-degree.pdf http://umpir.ump.edu.my/id/eprint/25689/2/41.1%20%20Dynamic%20flame%20behaviour%20in%20a%20straight%20and%2090-degree.pdf

id	ump-25689
recordtype	eprints
spelling	ump-256892019-12-17T02:47:43Z http://umpir.ump.edu.my/id/eprint/25689/ Dynamic flame behaviour in a straight and 90-degree bend pipe for premixed hydrogen/air and methane/air flame propagation Siti Zubaidah, Sulaiman R. M., Kasmani A., Mustafa Sina Davazdah, Emami TP Chemical technology Flame propagation inside a pipe is a complex phenomenon[1]. Worst, the fundamental issues on the physical and dynamic flame behaviour such as flame acceleration, pressure waves and flow turbulence are still unclear[2]. This paper reports on the experimental and numerical analyses towards understanding the combustion wave propagation in hydrogen and methane explosions, with the effect of pipe sizes and configurations. The experimental works were performed in a straight and 90-degree bend pipe with the length to diameter ratio, L/D is 40 and 51. FLACs code simulation was adopted to investigate the dynamic of flame behaviour in the pipes. From the results, it was observed that the presence of 90-degree bend enhances the explosion severity by a factor of 1.03-3.58 as compared to that of the straight pipe. Based on the simulation analysis (refer to the Figure 1), the compression effect and reversal flow at the bending region and the compression effect at the end of the pipe plays an important role to attenuate the burning rate, which results to a higher flame speed and hence, increases the pressure wave[3]. A maximum pressure wave of 700 kPa with the flame speed of 600 m/s was observed in the smaller pipe of L/D=40 with hydrogen fuel which indicated that the detonation-like event takes place. The ability of the flame to quench becomes insignificant in a smaller pipe, promoting a strong interaction of the fast flame and turbulence, particularly at the bending[4]. This phenomenon amplifies the mass burning rate, increases the flame speeds and leading to a higher pressure rise. From the results, it shows that fuel reactivity and pipe size and configuration gives a significant effect on the pressure wave and flame acceleration development which can lead to a catastrophic explosion. 2019 Conference or Workshop Item PeerReviewed pdf en http://umpir.ump.edu.my/id/eprint/25689/1/41.%20Dynamic%20flame%20behaviour%20in%20a%20straight%20and%2090-degree.pdf pdf en http://umpir.ump.edu.my/id/eprint/25689/2/41.1%20%20Dynamic%20flame%20behaviour%20in%20a%20straight%20and%2090-degree.pdf Siti Zubaidah, Sulaiman and R. M., Kasmani and A., Mustafa and Sina Davazdah, Emami (2019) Dynamic flame behaviour in a straight and 90-degree bend pipe for premixed hydrogen/air and methane/air flame propagation. In: Energy Security and Chemical Engineering Congress (ESCHE2019), 17-19 July 2019 , Parkroyal Resort Penang, Malaysia. pp. 1-12.. (Unpublished)
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English English
topic	TP Chemical technology
spellingShingle	TP Chemical technology Siti Zubaidah, Sulaiman R. M., Kasmani A., Mustafa Sina Davazdah, Emami Dynamic flame behaviour in a straight and 90-degree bend pipe for premixed hydrogen/air and methane/air flame propagation
description	Flame propagation inside a pipe is a complex phenomenon[1]. Worst, the fundamental issues on the physical and dynamic flame behaviour such as flame acceleration, pressure waves and flow turbulence are still unclear[2]. This paper reports on the experimental and numerical analyses towards understanding the combustion wave propagation in hydrogen and methane explosions, with the effect of pipe sizes and configurations. The experimental works were performed in a straight and 90-degree bend pipe with the length to diameter ratio, L/D is 40 and 51. FLACs code simulation was adopted to investigate the dynamic of flame behaviour in the pipes. From the results, it was observed that the presence of 90-degree bend enhances the explosion severity by a factor of 1.03-3.58 as compared to that of the straight pipe. Based on the simulation analysis (refer to the Figure 1), the compression effect and reversal flow at the bending region and the compression effect at the end of the pipe plays an important role to attenuate the burning rate, which results to a higher flame speed and hence, increases the pressure wave[3]. A maximum pressure wave of 700 kPa with the flame speed of 600 m/s was observed in the smaller pipe of L/D=40 with hydrogen fuel which indicated that the detonation-like event takes place. The ability of the flame to quench becomes insignificant in a smaller pipe, promoting a strong interaction of the fast flame and turbulence, particularly at the bending[4]. This phenomenon amplifies the mass burning rate, increases the flame speeds and leading to a higher pressure rise. From the results, it shows that fuel reactivity and pipe size and configuration gives a significant effect on the pressure wave and flame acceleration development which can lead to a catastrophic explosion.
format	Conference or Workshop Item
author	Siti Zubaidah, Sulaiman R. M., Kasmani A., Mustafa Sina Davazdah, Emami
author_facet	Siti Zubaidah, Sulaiman R. M., Kasmani A., Mustafa Sina Davazdah, Emami
author_sort	Siti Zubaidah, Sulaiman
title	Dynamic flame behaviour in a straight and 90-degree bend pipe for premixed hydrogen/air and methane/air flame propagation
title_short	Dynamic flame behaviour in a straight and 90-degree bend pipe for premixed hydrogen/air and methane/air flame propagation
title_full	Dynamic flame behaviour in a straight and 90-degree bend pipe for premixed hydrogen/air and methane/air flame propagation
title_fullStr	Dynamic flame behaviour in a straight and 90-degree bend pipe for premixed hydrogen/air and methane/air flame propagation
title_full_unstemmed	Dynamic flame behaviour in a straight and 90-degree bend pipe for premixed hydrogen/air and methane/air flame propagation
title_sort	dynamic flame behaviour in a straight and 90-degree bend pipe for premixed hydrogen/air and methane/air flame propagation
publishDate	2019
url	http://umpir.ump.edu.my/id/eprint/25689/ http://umpir.ump.edu.my/id/eprint/25689/1/41.%20Dynamic%20flame%20behaviour%20in%20a%20straight%20and%2090-degree.pdf http://umpir.ump.edu.my/id/eprint/25689/2/41.1%20%20Dynamic%20flame%20behaviour%20in%20a%20straight%20and%2090-degree.pdf
first_indexed	2023-09-18T22:39:36Z
last_indexed	2023-09-18T22:39:36Z
_version_	1777416825613582336

Dynamic flame behaviour in a straight and 90-degree bend pipe for premixed hydrogen/air and methane/air flame propagation

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