Effects of wind flow and sidewall restriction on the geometric characteristics of propane diffusion flames in tunnels

Guo, Fangyi; Ding, Long; Gao, Zihe; Yu, Longxing; Ji, Jie

doi:10.1016/j.energy.2020.117332

Cited by 28 publications

(5 citation statements)

References 21 publications

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“…The heat release rate (HRR) of the fire source was precisely controlled using a propane burner measuring a size of 0.1 m × 0.1 m × 0.1 m. The HRR of the fire source was controlled using a gas turbine flow meter. A similar method of simulating a fire source was employed by previous researchers [23][24][25]. Propane gas fuel was ignited with an electric spark igniter, and then, the front window was closed immediately after ignition.…”

Section: Methodsmentioning

confidence: 99%

Experimental and Theoretical Investigation of Longitudinal Temperature Attenuation and Smoke Movement in Urban Utility Tunnel Fires

Cao,

Liu,

Fan

et al. 2024

Fire

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The urban utility tunnel is an indispensable part of modern engineering construction. However, the fire risk cannot be ignored due to the narrow space and limited ventilation of the utility tunnel. A study of smoke filling is performed in a 1/8-scaled utility tunnel (25 m × 0.5 m × 0.45 m). Five heat release rates (5, 10, 15, 20 and 25 kW) and four positions of fire sources are used for tests. The initial position of the one-dimensional smoke movement of strong plume is determined. Based on the traditional model, the longitudinal temperature attenuation model of tunnel smoke is established with consideration of radiation and convection heat losses. The theoretical value of the longitudinal temperature rise of smoke is in good agreement with the experimental value. A one-dimensional spreading velocity model is established that coincides well with the experimental value, and the relative error is less than 20%. The spreading velocity of smoke is increased by the heat release rate. The velocity of the smoke spreading at the near end is smaller than that at the center, due to the long spreading route. The current conclusions disclosed in this study provide important guidance for the ventilation design of utility tunnels for fire smoke scenarios.

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Section: Methodsmentioning

confidence: 99%

Experimental and Theoretical Investigation of Longitudinal Temperature Attenuation and Smoke Movement in Urban Utility Tunnel Fires

Cao,

Liu,

Fan

et al. 2024

Fire

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“…Taking into account the effect of sidewall and ceiling on air entrainment of cable fire, as well as the heat transfer mechanism between the smoke and the inner wall and ceiling, the dimensionless H c * and D c * are introduced to depict the impact on fire (Guo et al, 2020;Gao et al 2019). H c * is the non-dimensional cable vertical height, which reflects the relative height of the cable in the vertical direction of the utility tunnel.…”

Section: Flame Extension Characteristicsmentioning

confidence: 99%

Evaluating the Combustion and Flame Extension Characteristics of Cable Fire in Utility Tunnels with Spontaneous Combustion Scenarios: An Experimental Study

et al. 2023

Preprint

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“…Here, L s represents the mixing length for subgrid-scale as expressed in Equation ( 21), while the term j S j can be evaluated from Equation (22). Here, the terms κ, d, C s , and V in Equation ( 21) symbolize the K arm an constant, distant to the closest wall, Smagorinsky constant, and volume of the computational cell, respectively.…”

Section: Numerical Modeling 221 | Governing Equationsmentioning

confidence: 99%

“…Among these, swirl-stabilized burners have been investigated the most for oxycombustion application. [13][14][15][16][17][18] Moreover, oxy-combustion of various fuels (eg, methane, [19][20][21] propane, [22][23][24] syngas, [25][26][27] ammonia, [28][29][30] and hydrogen [31][32][33] ) at varying combustion parameters, such as equivalence ratio (ϕ), oxygen fraction (OF), adiabatic flame temperature (T ad ), and flame speed (FS), has been examined as well. Most research is focused on methane, with fewer studies examining propane.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis supported with experimental measurements of premixed oxy‐propane flames in a fuel‐flex gas turbine combustor

et al. 2021

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The combustion, exhaust-gas concentrations, and stability characteristics of premixed CO 2 -diluted oxy-propane (C 3 H 8 /O 2 /CO 2 ) flames were investigated computationally using large eddy simulations (LES) in a swirl-stabilized model gas-turbine combustor. The simulations were carried out for ranges of equivalence ratio (Φ: 0.26-0.80) and oxygen fraction (OF: 35%-60%) at a fixed bulk inlet velocity of 5.2 m/s. The results indicate that the reaction rates increase with the increase of Φ and OF. Flames of the same adiabatic flame temperature (T ad ) show similar macro-and flowfield-structures, in terms of flame shape, flow circulation, and temperature, and species distributions, irrespective of the values of Φ and OF. At higher T ad , the flames were observed to be more compact with reduced flame thickness and higher Damkohler number (Da). In all cases, Da > 1 were observed, indicating the dominance of reaction rate in oxy-propane flames than the diffusion rate. A secondary IRZ was also observed near the outlet of the combustor. Mixture composition and combustion temperature influence the CO concentration at the combustor exit. The highest CO emission was observed at 0.17 ppm for the flame with highest Φ and T ad , meanwhile no CO emission was seen for flames with high OF and low Φ among the studied cases. Highlights 1. Adiabatic flame temperature is a quantifying parameter for flame

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Effects of wind flow and sidewall restriction on the geometric characteristics of propane diffusion flames in tunnels

Cited by 28 publications

References 21 publications

Experimental and Theoretical Investigation of Longitudinal Temperature Attenuation and Smoke Movement in Urban Utility Tunnel Fires

Experimental and Theoretical Investigation of Longitudinal Temperature Attenuation and Smoke Movement in Urban Utility Tunnel Fires

Evaluating the Combustion and Flame Extension Characteristics of Cable Fire in Utility Tunnels with Spontaneous Combustion Scenarios: An Experimental Study

Numerical analysis supported with experimental measurements of premixed oxy‐propane flames in a fuel‐flex gas turbine combustor

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