喷嘴雾化流场数值仿真及结构改进研究

Numerical simulation of the flow field and structural improvement in the nozzle atomization

针对空气喷嘴形状对雾化性能影响的问题,对不同扇面结构参数下的空气喷嘴的雾化性能进行了研究,对空气喷嘴结构参数与雾化流场之间的规律进行了归纳,提出了一种空气喷嘴的结构模型,基于雷诺N-S方程与标准K-ε湍流模型以及标准壁面函数法,采用CFD方法对不同扇面孔数量及不同扇面锥角下的空气喷嘴的雾化性能进行了数值仿真,分析了空气喷嘴不同扇面参数的改变对雾化性能的影响,并通过搭建喷枪台架实验,对优选的结构模型进行了实验验证。研究结果表明,仿真结果与实验数据基本符合要求,改进后的空气喷嘴雾化性能得到了改善,为今后空气喷嘴结构的优化设计提供了一定的参考。

Aiming at the problem that the atomization performance is influented by air nozzle shape,the atomization performance of air nozzle was studied with different fan structure parameters,the general pattern could be summarized between the structure parameters of air nozzle and the change of atomization flow field,a kind of air nozzle structure was proposed. Based on Reynolds N-S equations and standard K-ε turbulent mode as well as standard wall function method,the atomization flow field of air nozzle was simulated with different fan cone angle and fan hole number by using CFD method,and the atomization performance was analyzed by the change of fan parameters in air nozzle. Besides,the better structure models were verified by the bench tests of spray gun. The results indicate that the experimental data is similar that of simulation,and the atomization performance is actually improved which provide a certain reference for optimizing the air nozzle structure.