竖直下抛液体燃料爆炸抛撒的初步数值研究

对具有轴向初始速度即竖直下抛液体燃料的爆炸抛撒云雾形成过程进行了数值研究。近场的数据来自丁珏等的工作,以此数据作为远场初始参数。远场是燃料液滴与空气、燃料蒸汽、不同尺寸的液滴颗粒组成的多相体系之间的相互作用的过程。液滴的直径比较小,把液滴看成连续介质,且相互作用只考虑液滴的蒸发、破碎、碰撞聚合。轴向初速为0(静爆)时计算结果与实验结果相吻合。这说明本模型可以模拟爆炸抛撒云雾的形成过程,进而可以预估高速运动下云雾的形成过程。用以上模型计算了竖直下抛初速为100m/s、装填5kgPO的FAE装置的爆炸抛撒过程。所得的结果表明,100m/s的初速将影响云雾的最终形状及云雾内部的浓度分布。

Numerical simulation of the liquid fuel dispersal when moving downwards

The process of explosive dispersal of liquid fuel with an initial vertically downward speed has been studied by the numerical method. The process can be divided into near-field and far-field regimes in the numerical modeling. The data given by DING Jue are used as the initial conditions for the far-field regime calculation which is regarded as a multiphase flow problem accompanied with fuel droplet breaking, vaporizing and aggregating. The calculated results obtained for a rest fuel agree with the relevant experimental data, and indicate that this model can reasonably simulate the cloud formation due to the explosive dispersal and describe the explosive dispersal process of the fuel moving at a high speed downwards. The explosive dispersal process of the FAE (Fuel Air Explosive) device loaded with 5kg PO and pitched downward at an initial velocity 100m/s has been calculated. The calculated results indicate that the initial velocity can affect the final shape of the cloud and the concentration distribution of fuel inside the cloud.