Dispersion and secondary explosion model of propylene oxide droplets/aluminum powder under explosion driving: Considering the initial flow field

TY - JOUR

T1 - Dispersion and secondary explosion model of propylene oxide droplets/aluminum powder under explosion driving

T2 - Considering the initial flow field

AU - Zeng, Linghui

AU - Ren, Jiafan

AU - Wang, Zhongqi

AU - Li, Han

AU - Chen, Xing

AU - Fu, Shenghua

N1 - Publisher Copyright: © 2025 Elsevier B.V.

PY - 2025/6

Y1 - 2025/6

N2 - The dispersion and explosion characteristics of multiphase particles under explosion-driving hold significant importance for safety design and accident prevention in the chemical industry field. In order to solve the problems of discontinuity, incompleteness of flow field conditions and significant near-field errors in the existing numerical models, a dispersion and secondary explosion model of propylene oxide droplets/ aluminum powder under explosion driving is built. The model performs continuous computations for the four stages of initial dispersion, cloud development, concentration distribution, and secondary explosion. The model considers the initial flow field conditions, effectively reducing the near-field computational error to within 10 %. The dispersion and explosion processes of mixed fuel under three conditions (static, with wind speed and with falling speed) are studied through experiments and numerical models. The results show that under the initial wind speed, the dispersion radius of the downwind area extends by 16.8 %. The burnout rate increases by 15.0 %, and the peak overpressure of the secondary explosion rises by 4.2 %. Under the initial falling speed effect, the concentration distribution of the fuel cloud becomes more uniform. The proportion of the gas phase increases. It has been verified that the velocity change of the initial flow field can influence the stripping and evaporation effects of droplets, thereby strengthening the explosive properties of the cloud.

AB - The dispersion and explosion characteristics of multiphase particles under explosion-driving hold significant importance for safety design and accident prevention in the chemical industry field. In order to solve the problems of discontinuity, incompleteness of flow field conditions and significant near-field errors in the existing numerical models, a dispersion and secondary explosion model of propylene oxide droplets/ aluminum powder under explosion driving is built. The model performs continuous computations for the four stages of initial dispersion, cloud development, concentration distribution, and secondary explosion. The model considers the initial flow field conditions, effectively reducing the near-field computational error to within 10 %. The dispersion and explosion processes of mixed fuel under three conditions (static, with wind speed and with falling speed) are studied through experiments and numerical models. The results show that under the initial wind speed, the dispersion radius of the downwind area extends by 16.8 %. The burnout rate increases by 15.0 %, and the peak overpressure of the secondary explosion rises by 4.2 %. Under the initial falling speed effect, the concentration distribution of the fuel cloud becomes more uniform. The proportion of the gas phase increases. It has been verified that the velocity change of the initial flow field can influence the stripping and evaporation effects of droplets, thereby strengthening the explosive properties of the cloud.

KW - Dynamic distribution

KW - Multiphase model

KW - PO/Al mixed fuel

KW - Secondary explosion

UR - https://www.scopus.com/pages/publications/105002799368

U2 - 10.1016/j.powtec.2025.121045

DO - 10.1016/j.powtec.2025.121045

M3 - Article

AN - SCOPUS:105002799368

SN - 0032-5910

VL - 459

JO - Powder Technology

JF - Powder Technology

M1 - 121045

ER -