Investigation of the combustion law of delayed ignition ethanol spill fire in longitudinal ventilation

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2024-11-29 DOI:10.1016/j.ijthermalsci.2024.109575

Xue jing Hu, Cheng hao Ye, Jia xing Li, Mei qing Xia, Pei hong Zhang

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Abstract

The environmental conditions under which sustained spill fire accidents occur are complex and variable, and this paper investigates experimentally the effect of longitudinal ventilation in tunnel on the combustion law of delayed ignition spill fires. Experiments on instantaneous ignition and spill fires with delay of 10 s, 20 s, and 30 s were carried out using ethanol at a spill rate of 78 ml/min under a longitudinal wind speed of 0–1.5 m/s in tunnel. The results show that with the increase of longitudinal wind speed the flame inclination of the spill fire increases and the flame length first increases and then decreases. By analysing the force on the fuel layer and the force on the flame, and combining with the previous research, the prediction models of flame length and flame inclination were established. In the case of longitudinal wind speed, the spill fire burning area increases and then decreases with the increase of wind speed, and there is a critical wind speed, which is related to the delayed ignition time. The heat loss of the substrate in the longitudinal wind and the influence of the flame morphology on the thermal radiation feedback of the flame were considered, and it was found that the heat transfer of the fuel layer with the increase of the wind speed was gradually transitioned from the radiation dominated to the convection dominated. It was found that there was a general trend of increasing combustion rate with increasing wind speed and delayed ignition time.

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来源期刊

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.