Xue-jing Hu, Cheng-hao Ye, Jia-xing Li, Rong-xue Shang, Pei-hong Zhang
{"title":"延迟点火对倾斜表面乙醇溢出着火行为影响的实验研究","authors":"Xue-jing Hu, Cheng-hao Ye, Jia-xing Li, Rong-xue Shang, Pei-hong Zhang","doi":"10.1016/j.ijthermalsci.2024.109136","DOIUrl":null,"url":null,"abstract":"<div><p>Different ignition time leads to different spread and prior evaporation processes of the leaked liquid fuels before being ignited. Under the coupling effect of the kinetic characteristics of the spread fuels in inclined substrates and the heat transfer mechanisms to the fuel layer from fire plumes, the spill fire behavior with different ignition time on inclined substrates in confined space is more complex. The relevant experimental tests and theoretical analysis can provide significant theoretical and technical support for the risk control of spill fire. Tests were conducted with ethanol at a spill rate of 39 ml/min on inclined steel trenches with different slopes of 0°, 1°, 3°, 5°, with instantaneous ignition and different delayed ignition time such as 10 s, 20 s, 30 s. Based on the thermocouple test data and MATLAB image processing, parameters such as burning area, spread rate, burning rate and flame height were analysed. The maximum burning area is increased with increasing delayed ignition time for spill fires on the same sloped substrate. The quasi-steady burning area is independent of the delayed ignition time, but increases with the increasing of the substrate slope. Considering the different absorption of the radiative heat feedback by the fuel layer in confined space, a modification is proposed in the existing burning rate model of spill fires. It was found that the spread rate of spill fire increases with increasing slope, which increases along with the increasing delayed ignition time on the substrate of the same slope. By integrating the effects of burning rate, burning radius, combustion heat of the fuel, and the inclination angle, etc., an equation for fitting the flame height is derived. It is found that the flame height in the quasi-steady burning phase decreases with increasing substrate slope and is independent of the delayed ignition time.</p></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":null,"pages":null},"PeriodicalIF":4.9000,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Experimental study of the effect of delayed ignition on ethanol spill fire behavior on inclined surfaces\",\"authors\":\"Xue-jing Hu, Cheng-hao Ye, Jia-xing Li, Rong-xue Shang, Pei-hong Zhang\",\"doi\":\"10.1016/j.ijthermalsci.2024.109136\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Different ignition time leads to different spread and prior evaporation processes of the leaked liquid fuels before being ignited. Under the coupling effect of the kinetic characteristics of the spread fuels in inclined substrates and the heat transfer mechanisms to the fuel layer from fire plumes, the spill fire behavior with different ignition time on inclined substrates in confined space is more complex. The relevant experimental tests and theoretical analysis can provide significant theoretical and technical support for the risk control of spill fire. Tests were conducted with ethanol at a spill rate of 39 ml/min on inclined steel trenches with different slopes of 0°, 1°, 3°, 5°, with instantaneous ignition and different delayed ignition time such as 10 s, 20 s, 30 s. Based on the thermocouple test data and MATLAB image processing, parameters such as burning area, spread rate, burning rate and flame height were analysed. The maximum burning area is increased with increasing delayed ignition time for spill fires on the same sloped substrate. The quasi-steady burning area is independent of the delayed ignition time, but increases with the increasing of the substrate slope. Considering the different absorption of the radiative heat feedback by the fuel layer in confined space, a modification is proposed in the existing burning rate model of spill fires. It was found that the spread rate of spill fire increases with increasing slope, which increases along with the increasing delayed ignition time on the substrate of the same slope. By integrating the effects of burning rate, burning radius, combustion heat of the fuel, and the inclination angle, etc., an equation for fitting the flame height is derived. It is found that the flame height in the quasi-steady burning phase decreases with increasing substrate slope and is independent of the delayed ignition time.</p></div>\",\"PeriodicalId\":341,\"journal\":{\"name\":\"International Journal of Thermal Sciences\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":4.9000,\"publicationDate\":\"2024-05-14\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal of Thermal Sciences\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1290072924002588\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, MECHANICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Thermal Sciences","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1290072924002588","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
Experimental study of the effect of delayed ignition on ethanol spill fire behavior on inclined surfaces
Different ignition time leads to different spread and prior evaporation processes of the leaked liquid fuels before being ignited. Under the coupling effect of the kinetic characteristics of the spread fuels in inclined substrates and the heat transfer mechanisms to the fuel layer from fire plumes, the spill fire behavior with different ignition time on inclined substrates in confined space is more complex. The relevant experimental tests and theoretical analysis can provide significant theoretical and technical support for the risk control of spill fire. Tests were conducted with ethanol at a spill rate of 39 ml/min on inclined steel trenches with different slopes of 0°, 1°, 3°, 5°, with instantaneous ignition and different delayed ignition time such as 10 s, 20 s, 30 s. Based on the thermocouple test data and MATLAB image processing, parameters such as burning area, spread rate, burning rate and flame height were analysed. The maximum burning area is increased with increasing delayed ignition time for spill fires on the same sloped substrate. The quasi-steady burning area is independent of the delayed ignition time, but increases with the increasing of the substrate slope. Considering the different absorption of the radiative heat feedback by the fuel layer in confined space, a modification is proposed in the existing burning rate model of spill fires. It was found that the spread rate of spill fire increases with increasing slope, which increases along with the increasing delayed ignition time on the substrate of the same slope. By integrating the effects of burning rate, burning radius, combustion heat of the fuel, and the inclination angle, etc., an equation for fitting the flame height is derived. It is found that the flame height in the quasi-steady burning phase decreases with increasing substrate slope and is independent of the delayed ignition time.
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.