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基于两相界面追踪流体体积(volume of fluid,简称VOF)方法模拟了离心式喷嘴内部的流动过程,在数值方法可靠性验证基础上,得到了15个喷嘴构型的流量系数、液膜厚度以及雾化锥角.定义无量纲影响因子η,比较喷嘴结构参数对喷嘴性能的影响程度.除了喷嘴直径和旋流室直径外,重点研究了出口扩张角、等直段长径比等结构参数的影响,通过与试验相对比,综合以往经验公式,得到如下结论:增大旋流室长度,能够增大雾化锥角;在喷嘴出口增加扩张角,能够显著地减小液膜厚度,减小雾化锥角;增大切向口距喷嘴顶部距离,能够改善喷嘴性能;切向口个数和等直段长度对喷嘴性能影响不大.该工作为下一步优化喷嘴构型打下了基础.
Based on the two-phase interface tracking volume of fluid (VOF) method, the flow inside the centrifugal nozzle was simulated. Based on the verification of the numerical method, the flow coefficient of 15 nozzle configurations, the thickness of liquid film, Atomization cone angle.It is defined that the dimensionless influence factor η is used to compare the influence of nozzle structure parameters on nozzle performance.In addition to the nozzle diameter and the diameter of the swirl chamber, the structural parameters such as exit divergence angle, Compared with the experiment, we can get the following conclusions through the comparison of the experimental results and the previous empirical formula: Increasing the length of the swirl chamber can increase the cone angle; increasing the divergence angle at the exit of the nozzle can significantly reduce the film thickness and decrease At the same time, increasing the distance between the tangential nozzle and the top of the nozzle can improve the performance of the nozzle, and the number of the tangential nozzle and the length of the straight section have little effect on the performance of the nozzle, which lays the foundation for optimizing the nozzle configuration in the next step.