烟幕初始云团爆炸分散模型建立及计算方法

Explosive Dispersive Model and Computing Method of Initial Smoke Cloud

将烟幕初始云团爆炸分散过程分为等熵膨胀阶段和自由膨胀阶段,考虑第一阶段微元体受到的气动阻力,建立了烟幕初始云团爆炸分散的理论模型,采用欧拉法对模型进行数值计算。开展了野外测试试验,利用图像处理技术得到试验数据对模型进行对比分析。实验结果表明,采用欧拉法计算改进模型的结果,同等情况下,与计算未改进模型的结果相比更接近试验值,其相对误差减小5%～10%。

Based on a cylinder smoke device, the explosive dispersive process of smoke cloud was divided into two stages: the isentropic expansion and the free expansion. Considering the effect of aerodynamic drag on the first stage, the theoretical model of the explosive dispersive process of smoke cloud was established. The precision of model was improved. Then, the Euler method, it is proposed for calculating the model, which can improve convergence and veracity. The experimental results show that the results of the improved model are closer to the experimental values than the results of unimproved model by the Euler method, and the relative error is reduced by 5%~10%. Further, it is further explained that the improved theoretical model can describe the motion law of initial cloud explosion and dispersion process. At last, it can be used as an effective method to evaluate and calculate the parameters of the initial smoke cloud.