The statistics of flame–droplet interaction have been investigated for spherically expanding spray flames based on a three-dimensional DNS database. The source terms due to two-phase coupling arising from droplet evaporation in different governing equations for the gaseous carrier phase are considered to examine the effects of droplet diameter and overall (i.e. liquid+gaseous) equivalence ratio on the interaction between liquid and gaseous phases. Larger droplets are found to show higher probabilities of having greater values of slip velocity, and this behavior has been found to be unaffected by the overall equivalence ratio. Droplet diameter and number density have been found to significantly affect the interaction between liquid and gaseous phases since smaller droplets with overall fuel-lean equivalence ratio rarely interact with the flame in the reaction zone. Furthermore, source terms associated with the coupling between liquid and gaseous phases significantly contribute to mass, momentum, energy and mixture fraction transport equations. However, the contribution of droplet evaporation is relatively weak for the reaction progress variable transport equation.

已经基于三维DNS数据库研究了球形喷射喷雾的火焰与液滴相互作用的统计数据。在气态载流子相的不同控制方程中，由液滴蒸发引起的两相耦合引起的源项被认为是检验液滴直径和整体（即液+气）当量比对液相和气相之间相互作用的影响。发现较大的液滴显示出具有较大滑移速度值的较高概率，并且已发现该行为不受总当量比的影响。已经发现，液滴直径和数密度显着影响液相和气相之间的相互作用，因为具有总体贫燃料当量比的较小液滴很少与反应区中的火焰相互作用。此外，与液相和气相之间的耦合相关的源项对质量，动量，能量和混合分数传输方程有显着影响。但是，对于反应进程变量传输方程，液滴蒸发的贡献相对较弱。