Flame extension area and temperature profile of horizontal jet fire impinging on a vertical plate

Zhenhua Wang, Kuibin Zhou*, Le Zhang, Xuan Nie, Yueqiong Wu, Juncheng Jiang, Anne Simone Dederichs, Lu He

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Impinging jet fire of high exit momentum is frequently reported to induce the domino effect in industry fires. Less literature is available for the flame extension area and temperature distribution over a vertical plate impinged by the horizontal jet flame. Thus, this paper conducts a systematic experiment to reveal the effect of nozzle exit velocity, exit diameter and exit-plate spacing on the horizontally impinging jet fire. Experimental observation shows the evolution of flame pattern and color with an increase of exit velocity and a decrease of exit-plate spacing. The flame extension area induced by the horizontal jet flame impingement was measured by a novel method that combines the picture processing technique and the thermal imaging technique. By physical analysis, a new correlation coupling the turbulent Karlovitz stretch factor and the ratio of nozzle exit diameter to exit-plate spacing, was developed for the flame extension area of both horizontally and vertically impinging jet fire. The variation of maximum temperature in the impinging zone with the exit-plate spacing still fits the classic correlation of centerline temperature in the continuous and intermittent flames. However, the horizontally impinging jet fire plume holds a shorter intermittent flame region due to the flame upward bending. It is found that the temperature profile holds a big difference in the upward and downward directions along the vertical plate. A new uniform correlation, with the plume radius as the characteristic length scale, is proposed to well collapse all the temperature data in the impinging zone.

    Original languageEnglish
    JournalProcess Safety and Environmental Protection
    Volume147
    Pages (from-to)547-558
    ISSN0957-5820
    DOIs
    Publication statusPublished - 2021

    Bibliographical note

    Funding Information:
    This work is financially supported by the National Key R&D Program of China (No. 2016YFC0800100), and the National Natural Science Foundation of China under Grant Nos. 51876088 and 51834007. KZ acknowledges the support from the Six Talent Peaks Project of Jiangsu Province of China under Grant no. XNYQC-005 and China Scholarship Council under Grant no. 201908320209.

    Funding Information:
    This work is financially supported by the National Key R&D Program of China (No. 2016YFC0800100 ), and the National Natural Science Foundation of China under Grant Nos. 51876088 and 51834007. KZ acknowledges the support from the Six Talent Peaks Project of Jiangsu Province of China under Grant no. XNYQC-005 and China Scholarship Council under Grant no. 201908320209.

    Keywords

    • Exit velocity
    • Flame extension
    • Flame temperature
    • Impingement jet
    • Jet fire
    • Vertical plate

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