侧风条件下受侧壁约束的倾斜射流火焰特性的实验研究

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-06-20 DOI:10.1016/j.ijthermalsci.2025.110085

Hao Zhang , Gaoming Lu , Haiyong Cong , Gang Xu , Zhuyu Shao , Qianqian Xu

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引用次数: 0

摘要

过程工业中的喷气机火灾可能在台风等极端天气条件下发生。极端天气条件会产生复杂的流场，不仅会影响火焰的特性，还会大大增加喷射火灾蔓延到邻近设备的风险。本工作精心设计了一组丙烷火实验，喷嘴壁间距分别为0.03 m、0.20 m、0.35 m和∞；考虑了横向风速（0.00 ~ 3.12 m/s）和喷嘴角度（0 ~ 120°）对火焰的耦合效应。结果表明，侧壁的存在导致了射流火焰的振荡倾斜，并降低了喷风极限处的风速。对于水平和向下倾斜的射流火灾，侧壁导致火焰垂直高度的增加。此外，侧壁可以降低火焰脉动频率。建立了一个无量纲模型来预测在侧风和侧壁耦合作用下射流火焰的垂直高度。这一工作将对侧风作用下密闭射流火灾特性的研究产生积极的影响。

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Experimental study on the characterization of the inclined jet fire constrained by a sidewall under cross-wind conditions

Jet fires in the process industry may occur in extreme weather conditions such as typhoons. Extreme weather conditions generate intricate flow fields that not only affect the characteristics of flames but also substantially amplify the risk of jet fires spreading to neighboring equipment. In this work, a set of propane fire experiments was meticulously designed with nozzle wall spacing of 0.03 m, 0.20 m, 0.35 m, and ∞; the coupling effects of cross-wind velocity (0.00–3.12 m/s) and nozzle angle (0–120°) on the flame were also considered. The results show that the presence of sidewalls leads to oscillating tilted jet flames and a reduced wind velocity at the blow-out limit. For horizontal and downward-sloping jet fires, the sidewalls lead to an increase in flame vertical height. In addition, the sidewalls could reduce the flame pulsation frequency. A dimensionless model was developed to predict the vertical height of the jet flame under the influence of the cross-wind coupled with the sidewalls. This work may positively impact the study of the properties of confined jet fire under cross-wind.

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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.