两种雾化模型在横向流雾化数值模拟中的应用

通过对横向气流中燃料雾化的数值模拟,分析了两种常用的雾化模型TAB(Taylor analogy breakup)模型和Reitz波不稳定性模型中的经验参数变化对模拟结果的影响,为合理使用这两种雾化模型提供了参考.对雾化过程的模拟结果与实验结果的对比分析发现:虽然TAB和Reitz波模型都能对穿透深度进行很好的预估,但从液滴分布、SMD(Sauter mean diameter)和液滴速度等具体参数的计算结果来看,TAB模型的计算结果优于Reitz波模型,更适用于相关计算,并给出了适当的TAB模型的经验参数取值.最后,用TAB模型在相同经验参数下对不同燃料喷射速度的工况进行了计算,得到了满意的结果.这种先用实验数据校准经验参数,然后用校准后的经验参数计算相关未知结果工况的方法可以应用在今后的预估计算和研究中. 

Application on numerical simulation of atomization of liquid jet in crossflow using two atomization models

The liquid jet atomization in crossflow was numerically simulated using TAB model and Reitz wave instability model, both of which were often used in atomization simulation. The influence of different experience parameters of these two models were analyzed for reference. Both of these two models could give correct penetration, but TAB model could also provide better liquid distribution, SMD and liquid droplets velocity than Reitz wave model; proper experience parameter values were presented. The other cases with different inject velocities were calculated using TAB model with the same experience parameter, and good results were also attained. This method can be used in later prediction calculation.