Air induction nozzle has been used in many applications to decrease the drift potential and increase the crop protection efficacy. The efficient operation and design of these nozzles require understanding the flow characteristics inside the nozzle. Compared to other types of nozzles the studies related to air induction nozzles are very limited especially those concerned with the internal flow. The most important parameter that characterizes the operation of AIN is the air-liquid ratio. There are no studies investigate the effect of internal flow behavior and geometric parameters on the air-liquid ratio. Therefore, the main goal of this study is to investigate the influence of geometric parameters on air-liquid ratio based on the internal flow characteristics. The volume of fluid (VOF) method was used to investigate the internal flow characteristics of an air induction nozzle (AIN). The effect of internal flow characteristics on the air-liquid ratio (ALR) that defined as the ratio between air to liquid mass flowrates was studied. The analysis results of the air-liquid ratio were validated via comparison with the experimental results. The simulations were carried out using the STAR CCM+ software. Different mesh sizes and turbulence models were tested to achieve the best results agree with experimental results. The realizable k-ε turbulence model and mesh with a base size of 0.07 mm at throat diameter of 14 mm and diffuser angle of 20^O had the best results so the internal flow was studied using these parameters. The results demonstrated that the performance of AIN represented by ALR was affected by the internal flow characteristics such as velocity, pressure, and film thickness. The effect of diameter ratio (the ratio of throat diameter to pre-orifice diameter) and diffuser angles on the ALR was also investigated. Increasing diameter ratio resulted in increasing ALR at a certain value and then decreased. While increasing diffuser angle resulted in a slight increase in the ALR with further reduction at a diffuser angle of 40^O.

空气感应喷嘴已被用于许多应用，以降低漂移潜力并提高作物保护功效。这些喷嘴的高效运行和设计需要了解喷嘴内部的流动特性。与其他类型的喷嘴相比，与空气感应喷嘴相关的研究非常有限，尤其是与内部流动有关的研究。表征 AIN 操作的最重要参数是气液比。没有研究调查内部流动行为和几何参数对气液比的影响。因此，本研究的主要目的是基于内部流动特性研究几何参数对气液比的影响。流体体积 (VOF) 方法用于研究空气感应喷嘴 (AIN) 的内部流动特性。研究了内部流动特性对定义为空气与液体质量流量之比的气液比 (ALR) 的影响。通过与实验结果的对比，验证了气液比的分析结果。使用STAR CCM+软件进行模拟。对不同的网格尺寸和湍流模型进行了测试，以达到与实验结果一致的最佳结果。可实现的 k-ε 湍流模型和网格，基本尺寸为 0.07 mm，喉部直径为 14 mm，扩散角为 20 研究了内部流动特性对定义为空气与液体质量流量之比的气液比 (ALR) 的影响。通过与实验结果的对比，验证了气液比的分析结果。使用STAR CCM+软件进行模拟。对不同的网格尺寸和湍流模型进行了测试，以达到与实验结果一致的最佳结果。可实现的 k-ε 湍流模型和网格，基本尺寸为 0.07 mm，喉部直径为 14 mm，扩散角为 20 研究了内部流动特性对定义为空气与液体质量流量之比的气液比 (ALR) 的影响。通过与实验结果的对比，验证了气液比的分析结果。使用STAR CCM+软件进行模拟。对不同的网格尺寸和湍流模型进行了测试，以达到与实验结果一致的最佳结果。可实现的 k-ε 湍流模型和网格，基本尺寸为 0.07 mm，喉部直径为 14 mm，扩散角为 20^O的结果最好，因此使用这些参数研究了内部流动。结果表明，以 ALR 为代表的 AIN 的性能受内部流动特性如速度、压力和膜厚的影响。还研究了直径比（喉道直径与预孔道直径的比值）和扩散器角度对 ALR 的影响。增加直径比导致ALR增加到一定值，然后下降。同时增加扩散角度导致与在40的扩散器角进一步减小ALR略有增加^Ò。