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

doi:10.16265/j.cnki.issn1003-3033.2022.01.021

Abstract

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

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.

Figures/Tables 11

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