Experimental study on the maximum excess ceiling gas temperature generated by horizontal cable tray fires in urban utility tunnels

Huang, Ping; Ye, Shenglin; Qin, Liang; Huang, Yadong; Yang, Jian; Yu, Longxing; Wu, Dejian

doi:10.1016/j.ijthermalsci.2021.107341

Cited by 27 publications

(4 citation statements)

References 36 publications

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“…The determination of HRRs for cable fire has attracted a great deal of attention. Two methods are now commonly used to calculate it: oxygen consumption method (Tao et al, 2019) and mass loss method (Huang et al, 2022). Based on the theoretical analysis in section 2.1, the HRR is calculated by the oxygen consumption method.…”

Section: Combustion Characteristicsmentioning

confidence: 99%

“…The utility tunnel is an intensive underground infrastructure that concentrates electric power, telecommunication, gas, and other engineering pipelines in the same underground space (Ye et al, 2021). It plays a significant role in easing the strong demand for land resources and increasing socio-economic benefit, urban utility tunnels have been widely chosen as a key technology to address the construction of urban lifeline systems in many countries (Pan et al, 2020;Huang et al,2022). For example, up to 2020, the total mileage of utility tunnels in China has reached more than 5000 km, with 500 cities covered (Wang et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Combustion Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

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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“…In recent years, many underground cable fire accidents have occurred all over the world. 4,5 In reality, there may be more than one ignition point in a fire, which means there may be two or more sources of fire. When multiple fire sources burn, there is an interaction between the flames, which makes the burning behaviour, fire risk and extinguishing difficulty far more than those caused by a single fire source.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the flame merging and ceiling impingement behavior of transversely located double fire sources in an urban utility tunnel

Zhang

Gao

et al. 2023

Indoor and Built Environment

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The investigation of the fire characteristics and propagation behaviour in the urban utility tunnel is of great practical importance, especially for the conditions with double fire sources. In this work, a 1/8th scaled urban utility tunnel model was built to conduct the experiments to characterize the flame merging and ceiling impingement behaviour of transversely located double fire sources. Two rectangular fire sources with the same dimension were used, and their heat release rate (HRR) and fire source spacings were varied to consider the typical scenarios. Results show that for the smaller HRR, the tunnel ceiling and sidewalls have little influence on the flame merging of double fire sources. With the increase of HRR, the flame gradually impinges on the tunnel ceiling and forms a stable ceiling jet flame extension, and the ceiling and sidewalls of the tunnel can promote the merging of the flames of the double fire sources. Besides, with the increase of the fire source spacings, the flame merging probability P m can be divided into three stages, that is, (i) complete merging stage, (ii) intermittent merging stage and (iii) complete separation stage. On this basis, the predicting relation of P m was obtained by using the piecewise function.

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“…Utility tunnel construction has received strong support and promotion due to its advantages of centralized management of pipeline laying and convenient maintenance [1]. However, owing to the special structure of utility tunnel, it has a higher risk of fire.…”

Section: Introductionmentioning

confidence: 99%

Study on Fire Extinguishment Performance of Water Mist System in a Utility Tunnel

Yang

et al. 2023

J. Phys.: Conf. Ser.

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The power cable fire in an utility tunnel is difficult to control due to its characteristics of narrow and long structure, cable layer arrangement, and variable fire locations. Water mist system is one of commonly used method for fire control. This paper studied the fire extinguishing efficiency of high-pressure water mist system in utility tunnel by large eddy simulation (LES). In order to compare the fire extinguishing effect of the water mist system, two working conditions are designed, that is, the utility tunnel with water mist system and without water mist system. Results have shown that continuously operating of high-pressure water mist system can extinguish cable fires effectively. The cooling effect of the water mist is obvious and it can control fire development or extinguished fire. The temperature of utility tunnel would be reduced so as to prevent the structure from being destroyed.

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Experimental study on the maximum excess ceiling gas temperature generated by horizontal cable tray fires in urban utility tunnels

Cited by 27 publications

References 36 publications

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

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

Experimental study on the flame merging and ceiling impingement behavior of transversely located double fire sources in an urban utility tunnel

Study on Fire Extinguishment Performance of Water Mist System in a Utility Tunnel

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