含水雾横向风作用下双喷口射流扩散火焰特性

doi:10.16265/j.cnki.issn1003-3033.2022.01.021

中国安全科学学报 ›› 2022, Vol. 32 ›› Issue (1): 157-163.doi: 10.16265/j.cnki.issn1003-3033.2022.01.021

含水雾横向风作用下双喷口射流扩散火焰特性

姜桦¹^,²(), 刘长春¹^,²^,^**(), 黄林远¹^,², 吴鹏志¹^,², 邓天刁¹^,²

¹西安科技大学安全科学与工程学院,陕西西安 710054
²陕西省工业过程安全与应急救援工程技术研究中心,陕西西安 710054

收稿日期:2021-10-17 修回日期:2021-12-13 出版日期:2022-01-28 发布日期:2022-07-28
通讯作者: 刘长春
作者简介:
姜桦(1996—),女,四川绵阳人,硕士研究生,研究方向为火灾动力学。E-mail: 1033055794@qq.com。
刘长春副教授
基金资助:
国家自然科学基金资助(51604215); 陕西省创新团队能力支持计划项目(2020TD-021); 榆林市2020年科技计划项目(CXY-2020-032)

Investigation on characteristics of dual nozzle jet diffusion flame under cross-wind with water mist

JIANG Hua¹^,²(), LIU Changchun¹^,²^,^**(), HUANG Linyuan¹^,², WU Pengzhi¹^,², DENG Tiandiao¹^,²

¹School of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an Shaanxi 710054, China
²Shaanxi Engineering Research Center for Industrial Process Safety and Emergency Rescue, Xi'an Shaanxi 710054, China

Received:2021-10-17 Revised:2021-12-13 Online:2022-01-28 Published:2022-07-28
Contact: LIU Changchun

摘要/Abstract

摘要：

为探究在横向风作用下不同超细水雾含量对双喷口射流扩散火焰燃烧特性的影响,利用高速摄像机拍摄火焰几何形态,分析不同喷口间距和横向风中的超细水雾含量对火焰形态演化、火焰长度和火焰吹熄极限的影响,并基于前人数学模型,推导与增长区域试验数据具有较好相关性的火焰拉伸长度变化的经验公式。结果表明:随着横向风中雾通量的增加,双喷口火焰颜色由蓝黄色转变为橙黄色,同时导致火焰的亮度大幅度降低;由于水雾降温抑制使得火焰拉伸长度随雾通量增加而先增加后降低,且随动量比的增加,火焰拉伸长度先增加后逐渐稳定;雾通量的增加会降低燃料流速较大的火焰吹熄极限。

关键词: 超细水雾, 横向风, 双喷口, 射流扩散火焰, 火焰长度, 吹熄极限

Abstract:

In order to explore impacts of different superfine water mist content on combustion characteristics of dual nozzle jet diffusion flame under cross-wind, flame geometry was recorded by using a high-speed camera, and impacts of superfine water mist content on geometry evolution, length, and blow-out limit of flame were analyzed for different nozzle spacing and cross-wind. Then, based on the current mathematical model, an empirical formula of flame stretching length variation which featured good correlation with experimental data of growth region was deduced. The results show that as mist flux under cross-wind increases, the color of dual nozzle flame changes from blue-yellow to orange-yellow, and flame brightness is greatly reduced. Due to suppression of water mist cooling, flame stretching length first increases and then decreases along with increase of mist flux, and the length first increases and then gradually stabilizes when momentum ratio increases. Moreover, increase of mist flux will reduce flame blow-out limit with a larger fuel flow rate.

Key words: superfine water mist, cross-wind, dual nozzle, jet diffusion flame, flame length, blow-out limit

姜桦, 刘长春, 黄林远, 吴鹏志, 邓天刁. 含水雾横向风作用下双喷口射流扩散火焰特性[J]. 中国安全科学学报, 2022, 32(1): 157-163.

JIANG Hua, LIU Changchun, HUANG Linyuan, WU Pengzhi, DENG Tiandiao. Investigation on characteristics of dual nozzle jet diffusion flame under cross-wind with water mist[J]. China Safety Science Journal, 2022, 32(1): 157-163.

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含水雾横向风作用下双喷口射流扩散火焰特性

Investigation on characteristics of dual nozzle jet diffusion flame under cross-wind with water mist

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