钛液滴作用下钛合金薄片火蔓延的数值模拟

doi:10.7527/S1000-6893.2021.25652

材料工程与机械制造

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钛液滴作用下钛合金薄片火蔓延的数值模拟

罗圣峰¹, 王光健², 马小斌³, 郑丽丽², 汪瑞军³

1. 清华大学工程物理系公共安全研究院, 北京 100086;
2. 清华大学航天航空学院, 北京 100086;
3. 中国农业机械化科学研究院, 北京 100083

收稿日期:2021-04-12 修回日期:2021-05-10 出版日期:2022-09-15 发布日期:2021-06-29
通讯作者: 郑丽丽,E-mail:lh200300206@163.com E-mail:lh200300206@163.com
基金资助:
国家科技重大专项(2017-VII-0012-0108)；国家重点科研计划(2020YFA0714500)；国家自然科学基金面上项目(7204100828)；中国博士后科学基金(2019M660664)

Simulation of flame spread of titanium-alloy sheet under effect of titanium droplet

LUO Shengfeng¹, WANG Guangjian², MA Xiaobin³, ZHENG Lili², WANG Ruijun³

1. Institute of Public Safety, Department of Engineering Physics, Tsinghua University, Beijing 100086, China;
2. School of Aerospace Engineering, Tsinghua University, Beijing 100086, China;
3. China Academy of Agricultural Mechanization Sciences, Beijing 100083, China

Received:2021-04-12 Revised:2021-05-10 Online:2022-09-15 Published:2021-06-29
Supported by:
National Science and Technology Major Project (2017-VII-0012-0108); National Key Research and Development Program of China (2020YFA0714500); National Science Foundation of China (7204100828); China Postdoctoral Science Foundation (2019M660664)

摘要/Abstract

摘要： 针对钛火液滴法实验过程中钛合金薄片被引燃后的火蔓延行为, 基于数值模拟研究钛合金在高温热源作用下的钛火传播过程。研究了在不同初始温度和环境条件下钛合金薄片中心被引燃后向四周蔓延的过程, 并分析了钛合金薄片被烧断的条件。结果表明：钛合金薄片被引燃的初始阶段, 钛火传播前沿以圆弧形态传播, 圆弧形火焰前锋在薄片边缘会因边沿效应而出现拉伸；当薄片初始温度较低时钛合金起火经短暂传播后缓慢熄灭, 当初始温度较高时钛合金薄片最终被烧断；通过参数分析发现钛合金薄片燃烧断裂的临界对流换热系数和初始温度呈线性关系, 临界氧分压和初始温度呈负指数函数关系。

关键词: 钛合金, 钛液滴, 火蔓延, 临界条件, 参数分析

Abstract: This work analyzes the flame spread behaviors of the titanium-alloy sheet in the experiment of the titanium-fire-drop method. The flame spread process of titanium alloy under the effect of a high-temperature heat source was investigated based on numerical simulation. The process of flame spread of titanium-alloy sheet after being ignited in the center under different initial temperatures and environmental conditions is studied. The conditions of the titanium-alloy sheet being burned to fracture are analyzed. The results show that the flame front propagated in an arc shape at the beginning, and stretched at the edge of the sheet due to the edge effect. When the initial temperature of the sheet was low, the flame of the titanium alloy after ignition spread for a short time and then went out slowly. The titanium alloy sheet was finally burned to fracture when the initial temperature was high. Parameter analysis shows that the critical convective heat transfer coefficient of combustion fracture of the titanium alloy sheet is linearly related to the initial temperature, and the relationship between the critical partial pressure of oxygen and the initial temperature is a negative exponential function.

Key words: titanium alloy, titanium droplet, flame spread, critical condition, parameter analysis

中图分类号:

V19
TK05

罗圣峰, 王光健, 马小斌, 郑丽丽, 汪瑞军. 钛液滴作用下钛合金薄片火蔓延的数值模拟[J]. 航空学报, 2022, 43(9): 425652-425652.

LUO Shengfeng, WANG Guangjian, MA Xiaobin, ZHENG Lili, WANG Ruijun. Simulation of flame spread of titanium-alloy sheet under effect of titanium droplet[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(9): 425652-425652.

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钛液滴作用下钛合金薄片火蔓延的数值模拟

Simulation of flame spread of titanium-alloy sheet under effect of titanium droplet

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