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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (9): 425652.doi: 10.7527/S1000-6893.2021.25652

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

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

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

  1. 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)

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

CLC Number: