爆炸与冲击2025，Vol.45Issue(12)：98-113,16.DOI:10.11883/bzycj-2024-0486
温压炸药隧道内爆炸结构约束对冲击波及爆炸火团的影响规律
Influence of tunnel structural confinement on shock wave and fireball generated by explosion of a thermobaric explosive in a tunnel
摘要
Abstract
To investigate the propagation characteristics of blast shock waves and the thermal effects of fireballs in tunnel explosions involving thermobaric explosives,numerical simulations were conducted using OpenFOAM.The simulation accuracy was validated through comparative analysis with experimental data from tunnel explosion tests.The effects of axial distance along the tunnel and explosive mass on shock wave propagation characteristics and fireball thermal effects were systematically studied.The results demonstrate that under identical charge mass conditions when the axial distance exceeds 1/3 of the equivalent tunnel diameter,the attenuation of shock wave overpressure peak and planar wave formation distance remain independent of axial position.After planar wave formation,the impulse increases with axial distance before stabilizing.At the same axial explosion distances,the planar wave formation distance increases with explosive mass.Post planar wave formation,the attenuation pattern of the shock wave overpressure peak remains unaffected by charge mass.In contrast,the impulse exhibits a growth trend proportional to the increase in charge mass.Under the influence of the tunnel portal energy dissipation effect(tunnel effect),explosion-induced fireballs exhibit a consistent propagation tendency toward the proximal tunnel portal.The confinement imposed by tunnel walls restricts the lateral expansion of the fireball perpendicular to the tunnel axis while facilitating the formation of a high-temperature tip along the longitudinal axis.Especially,the temperature distribution along the tunnel axis maintains axial symmetry despite directional propagation biases.A fitting formula was established to characterize the relationship between the maximum axial propagation distance of explosion fireballs at different temperatures and the explosive mass,enabling the prediction of axial spread limits for fireballs at specific temperatures in typical thermobaric explosive detonations within tunnel-confined environments.关键词
温压炸药/冲击波/泄能效应/火团温度/隧道约束Key words
thermobaric explosive/shock wave/energy release effect/fireball temperature/tunnel confinement分类
数理科学引用本文复制引用
陈飞翔,张国凯,何勇,吴玉欣,刘黎旺,邓国强..温压炸药隧道内爆炸结构约束对冲击波及爆炸火团的影响规律[J].爆炸与冲击,2025,45(12):98-113,16.基金项目
国家自然科学基金(52278504) （52278504）
中央高校基本科研业务费专项资金(309231B8805) （309231B8805）
江苏省自然科学基金(BK20220141) （BK20220141）
