Experimental study on the dynamic evolution behavior and heat transfer of flame spread over continuously flowing diesel fuel

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer Pub Date : 2024-11-13 DOI:10.1016/j.icheatmasstransfer.2024.108287

Sai Luo, JingBo Xu, Chen Wang, Jie Ji

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引用次数: 0

Abstract

Flame may spread over accidentally leaked liquid fuel, which is essentially related to multi-phase flows and heat transfer. This paper investigates the dynamic evolution behavior and the heat transfer mechanism of flame spread over stationary and flowing diesel fuel with various discharge flow rates. Results show that for flowing fuel cases, there is a considerable long-lasting unsteady flame spread stage, in which the subsurface flow velocity (u_s) and flame spread rate (V_f) increase as the spread proceeds. This is significantly different from flame spread over stationary fuel, in which u_s and V_f remain almost unchanged. Driving mechanism of the subsurface flow and variation of momentum balance is analyzed for the explanation. Besides, theoretical analysis is conducted to predict the acceleration, whose results agree with experimental data. Moreover, based on the momentum balance, it is found that u_s cannot be assumed to be linearly distributed along the fuel thickness, detailed velocity profiles are further clarified. In addition, dynamic variation of the heat transfer process is quantitatively revealed, and there is a transition of the dominant contribution to the heat needed for flame spread. Flame radiation plays a more significant role initially, as flame spreads, liquid convection gradually plays the dominant role.

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连续流动柴油上火焰蔓延的动态演化行为和传热实验研究

火焰可能会在意外泄漏的液体燃料上蔓延，这本质上与多相流和热传导有关。本文研究了火焰在不同排放流量的静止和流动柴油上蔓延的动态演化行为和传热机理。结果表明，在流动燃料的情况下，存在一个相当长的非稳定火焰蔓延阶段，在这个阶段中，随着火焰蔓延的进行，次表层流速（us）和火焰蔓延率（Vf）都会增加。这与静止燃料上的火焰蔓延明显不同，在静止燃料上，us 和 Vf 几乎保持不变。分析了次表层流动的驱动机制和动量平衡的变化，以解释这一现象。此外，还进行了理论分析以预测加速度，其结果与实验数据一致。此外，在动量平衡的基础上，发现我们不能假定沿燃料厚度线性分布，并进一步阐明了详细的速度剖面。此外，还定量地揭示了传热过程的动态变化，以及火焰蔓延所需热量的主导贡献的转变。最初，火焰辐射起着比较重要的作用，随着火焰的扩散，液体对流逐渐起主导作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Communications in Heat and Mass Transfer 工程技术-力学

CiteScore

11.00

自引率

10.00%

发文量

648

审稿时长

32 days

期刊介绍： International Communications in Heat and Mass Transfer serves as a world forum for the rapid dissemination of new ideas, new measurement techniques, preliminary findings of ongoing investigations, discussions, and criticisms in the field of heat and mass transfer. Two types of manuscript will be considered for publication: communications (short reports of new work or discussions of work which has already been published) and summaries (abstracts of reports, theses or manuscripts which are too long for publication in full). Together with its companion publication, International Journal of Heat and Mass Transfer, with which it shares the same Board of Editors, this journal is read by research workers and engineers throughout the world.