定容燃烧弹中火核生成及初期发展的数值模拟

本发展了一种新的预混湍流火核生成及初期发展的模型，该模型基于准维模型的基本思想，摒弃了湍流燃烧速度模型，以数值生成的湍流场对火焰前锋面的客观影响推动燃烧计算过程。模型考虑了很多对火核生成及初期发展有影响的因素，如已燃区的传热，非绝热效应，曲率和伸展效应等等；通过利用模拟得到的３维湍流速度场，首镒实现了对火核几何形状的３维模拟；模型的模拟结果和试验结果有很好的吻合性，这说明模型是合理的。

Numerical Simulation for Flame Kernel Initiation and Early Development in a Constant Volume Combustion Bomb

A new combustion model for flame kernel initiation and early development in a constant volume combustion bomb has been established.Basing on quasi dimensional model,the development of turbulent combustion in this model was dominated by the effects of the simulated velocity field on flame front instead by a given flame speed relation,thus eliminates the influence of personal experience on simulation results.This model considers many factors that influence flame kernel initiation and early development,such as heat transfer from burned gas,non adiabatic effects,strech and curvature effects,etc.By using the simulated turbulent velocity fields,three dimensional geometric details of turbulent flame was obtained for the first time.It is found from the comparison between model and experiment that the numerical model is reasonable.The characters of turbulent combustion in a combustion bomb and the effects of turbulence intensity and turbulence scale on combustion were discussed in detail.