激波诱导油液柱变形、破碎及其雾化过程研究

Study of Deformation, Breakup and Atomization of Diesel Fuel Column by Shock Wave

为进一步了解柴油爆炸抛撒云雾形成过程以及爆炸性能,开展了激波作用-10#柴油液柱实验。采用阴影成像技术记录油柱的变形、破碎行为和雾化过程,建立了油柱变形与破碎模型,并根据无量纲参数公式计算了油柱破碎模式,分析了激波作用后油柱变形和破碎雾化的特征。结果表明:激波遇到油柱会发生绕射现象,激波诱导的高速气流将继续作用油柱,油柱继而发生弓箭形变形并最终导致其破碎、雾化。柴油柱在153μs时完成变形发生爆炸破碎,形成大量雾滴颗粒。雾滴在气动力、空气阻力等作用下继续运动形成云雾团,激波波速越大,油柱破碎越剧烈,雾化粒径也越小。

In order to further understand the formation process of diesel fuel explosion and dispersion cloud,the experiments of-10#diesel fuel column by shock wave were carried out.The deformation,breakup behavior and atomization process of diesel fuel column were recorded by shadow imaging technology.A comprehensive model of the deformation and breakup of diesel fuel column was developed.The breakup mode of diesel fuel column was calculated according to the dimensionless parameter formula,and the characteristics of the deformation,breakup and atomization of diesel fuel column by shock wave are analyzed.It is shown that the shock wave will be diffracted when encountering diesel fuel column.The high-speed air flow induced by shock wave continues to act on diesel fuel column,then diesel fuel column undergoes bow shaped deformation and eventually leads to its breakup and atomization.At 153μs,a large number of droplet particles are formed.Under the action of aerodynamic force and air resistance,the droplets continue to move to form cloud clusters.The larger the shock wave velocity is,the stronger the breakup of diesel fuel column is,and the smaller the atomized particle size is.