Study of the effect of bluff body size on stability limits of a premixed natural gas swirl burner

Behzadi, Milad; Siyadat, Seyed Hamzeh; Ommi, Fathollah; Saboohi, Zoheir

doi:10.1007/s10973-020-10520-5

Cited by 8 publications

(5 citation statements)

References 45 publications

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“…The correlation between the tangential velocity and equivalence ratio at the flashback condition is fairly strong when the tangential velocity is used. Through the figure, it was observed that altering the bluff-body's size had a clear effect on the flashback limits while having a slight effect on the blowoff limits, and this is consistent with [37]. With the decrease of B, the limits of flashback equivalence ratios are observed to decrease and move towards the lean regions at the range of 𝑊 𝑖𝑛𝑙𝑒𝑡 from 0.58 to 2.83 m/s.…”

Section: Effect Of Bluff-body Diametersupporting

confidence: 74%

Experimental Study of the Effect of Swirl Number and Bluff Body Size on the Stability Map of Premixed LPG Flames in a Tangential Swirl Burner

2023

jjmie

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This article presents an experimental analysis investigating the impact of swirl number (S) and annular passage area (B) on the stability limits of the premixed flames in a 20-kW tangential swirl burner. Three nozzles with different diameters (𝐷 𝑁 = 20, 25, and 30 mm) were used to achieve variable geometric swirl numbers (𝑆 𝑔 = 0.918, 1.148, and 1.377).Three central fuel injectors (as a bluff-body) with different diameters (𝐷 𝑖𝑛𝑗 = 6, 8, and 12 mm) were used to obtain different annular passage areas.In the first part of the study, the results revealed that as swirl number (S) increased, flashback limits (FB) decreased (i.e., worsened), and the flame resistance to blowoff (BLO) improved. Thus, the best flame stability map was obtained with increasing S. In the second part of the study, changing the central fuel injector diameter (bluff-body) led to a change in the annular passage area (B) and had an important role in resisting and preventing flashback from combustion-induced vortex breakdown (CIVB). When B was increased (increasing fuel injector diameter), a significant improvement in flashback resistance was observed due to an increase in the momentum of the unburned mixture, while with a decrease in B (reducing fuel injector diameter), the limits of the flashback decreased and moved towards lean regions. However, it was found that the burner operation map increases with increasing B; the best operation map was found at S = 1.377 and B = 0.4, and it was (𝜑 𝐹𝐵 = 1.18 -𝜑 𝐵𝐿𝑂 = 0.42) in the inlet tangential velocity range (𝑊 𝑖𝑛𝑙𝑒𝑡 = 0.58 to 2.84 m/s).Also, tests were carried out without the use of a bluff-body (central fuel injector), and it was found that there is a great impact on the flow field and the location and shape of the central recirculation zone (CRZ); thus, the stability map was narrower than that using the bluffbody. Consequently, adding bluff-bodies to swirling flows improves the mixing properties, increases the intensity of the CRZ, thus enhances the stable operation map. In addition, the bluff-body's presence greatly helps in eliminating CIVB flashback.

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Section: Effect Of Bluff-body Diametersupporting

confidence: 74%

Experimental Study of the Effect of Swirl Number and Bluff Body Size on the Stability Map of Premixed LPG Flames in a Tangential Swirl Burner

2023

jjmie

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“…Therefore, the bluff-body is one of the methods widely used to stabilize the flame in many industrial applications [9,10,14]. The main benefit of using bluff-bodies is the creation of recirculation zones which in turn help to improve mixing of the reactants, and the combustion process [65,88,107].…”

Section: Flame Stabilization By a Bluff-bodymentioning

confidence: 99%

“…Thus, the operating conditions of the combustors can be determined between these limits [5][6][7][8]. The use of swirling flows and bluff-bodies greatly helps to stabilize the flame in most combustion devices [9][10][11]. The swirl flow leads to creating a central recirculation zone (CRZ), where it works to recirculate the heat and active chemical species to the root of flame, hence stabilizing the flames in zones of relatively low velocity [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…They found that the flame stability map improved and a better attached flame was obtained with an increase in the swirl number. Behzadi et al [9] (2022) studied the effect of the bluff-body size on the flashback and blowoff limits of a premixed natural gas flame in a swirl burner. They reported that the blowoff limits were slightly affected, while the flashback limits were greatly affected by the change in the bluff-body size.…”

Section: Introductionmentioning

confidence: 99%

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Flame Stability in Swirling and Bluff-Body Burners: A Review

Shakir Mahmood,

Saleh

2023

Jurnal Teknologi

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Flame stability is one of the main challenges facing the different combustion applications. A lot of undesirable phenomena such as blow-off and flashback may occur according to the instability of the flame causing damage to the overall combustion system. Therefore, it is necessary to develop methods which help improve the combustion process and obtain wider flame stable regions. Among these methods, swirling flows and bluff-bodies are the most commonly used in flame stabilization. These may create central recirculation zones (CRZ’s) that, in turn, recirculate the heat and active chemical species to the root of flame, improving the reactants mixing and as a result, flame stability. Hence, the current article presents an overview of flame stability mechanisms and the operation map using swirling flows and bluff-bodies. The effect of the swirl number (S) and burner’s geometry, as well as the influence of the bluff-body shape, size and position on the flame stabilization mechanisms are discussed.

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“…The use of fossil fuels for energy generation via thermal power plants has caused global warming, climate change, and the release of toxic gases. Thus, it is necessary to consider alternative solutions [1,2,3,4]. In this regards, the use of renewable energy is the major solution to protect the environment.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of a tethered-glider for generating electrical-renewable energy using the pumping cycle method

2022

IJM

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The issue of energy generation from wind is considered one of the main ways to develop renewed energy in some areas worldwide. The important point in generating energy from wind is the permanent wind availability, which is called the existence of effective wind. According to studies, there is no effective wind at ground level in many areas of the world, while this wind is available at altitude. The Accessibility of wind in altitude has led to the development of various technologies in energy production from airborne systems. In this research, airborne wind energy systems technologies have been investigated, and a tethered-glider was designed and analyzed using analytical methods for energy generation at a 200-meter altitude. The main factor in designing a glider is the optimal ratio of lift to drag coefficient; For calculating lift to drag coefficient, the vortex lattice method (VLC) is used in this paper. The results illustrate that a glider with a wingspan of 5.2 meters can produce a maximum of 10 kilowatts of energy over one cycle. Increasing this ratio can increase energy production efficiency.

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Study of the effect of bluff body size on stability limits of a premixed natural gas swirl burner

Cited by 8 publications

References 45 publications

Experimental Study of the Effect of Swirl Number and Bluff Body Size on the Stability Map of Premixed LPG Flames in a Tangential Swirl Burner

Experimental Study of the Effect of Swirl Number and Bluff Body Size on the Stability Map of Premixed LPG Flames in a Tangential Swirl Burner

Flame Stability in Swirling and Bluff-Body Burners: A Review

Design and analysis of a tethered-glider for generating electrical-renewable energy using the pumping cycle method

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