超声速横向气流中燃料雾化的数值模拟

Numerical simulation of atomization of liquid jet in supersonic crossflow

对超声速横向气流中燃料雾化过程采用欧拉-拉格朗日方法进行了数值模拟,气相场用欧拉法计算,液相场采用拉格朗日粒子跟踪方法计算,通过方程源项考虑液相对气相的影响.在液相的拉格朗日计算中采用改进的混合雾化模型来研究雾化过程.针对超声速横向气流中雾化的特点,结合雾化机理和实验测量结果,对原有的混合雾化模型进行了改进,并将改进后的计算结果与TAB(Taylor Analogy Breakup)模型和Reitz波模型的计算结果进行了对比.结果表明:改进的混合雾化模型的计算结果与实验测量值符合较好,更适合用于超声速横向气流中燃料雾化的数值模拟.

Liquid jet atomization in supersonic crossflow was simulated using Euler-Lagrangian method.Euler method was used for gas phase and Lagrangian method was used for liquid phase.The liquid influences were calculated by source items in gas equations.The atomization process was simulated using the hybrid atomization model.This model was improved according to the atomization mechanism and experimental results.The improved simulation results were compared with Taylor analogy breakup（TAB） model and Reitz wave model.The calculation results agree well with the experiment results.It is found that the advanced hybrid atomization model is much more suited for the current calculation than the other models.