The inner fluid flow within the micro-sac injector is investigated numerically via AVL-Fire CFD code particularly in a microscale dimension of nozzle hole is carried out in the present work. The structural parameters of the injector are left unchanged, while the physical properties of the fluid such as pressure gradient and fluid temperature are taken into account to survey their influence on vapor volume fraction evolution, vapor mass flow rate, cavitation inception, and discharge coefficient. The reliability of modeling results is confirmed by comparing obtained data with experimental one and numerical results of Payri et al. and a close match served as an indication for the accuracy of the methodology. The multiphase modality is activated for the two-fluid model application in the nozzle segment, while the interfacial source term accounts for the momentum exchange of phases in the cavitation drag model. According to results, increasing the fuel temperature is a factor for increasing turbulent kinetic energy; meanwhile, vapor volume fraction at different times shows a different trend. Concerning the discharge coefficient, it seems that increasing the fluid temperature reduces this parameter. In contrast, increasing the pressure gradient leads to a considerable increase in the discharge coefficient.

通过AVL-Fire CFD代码对微囊注射器内的内部流体流动进行了数值研究，尤其是在当前工作中对喷嘴孔的微尺度尺寸进行了研究。喷射器的结构参数保持不变，同时考虑流体的物理特性（例如压力梯度和流体温度）以调查其对蒸气体积分数演变，蒸气质量流量，气蚀开始和排放系数的影响。通过将获得的数据与Payri等人的实验数据和数值结果进行比较，可以确定建模结果的可靠性。紧密匹配可表明该方法的准确性。对于喷嘴段中的双流体模型应用，激活了多相模态，而界面源项则说明了空化阻力模型中各相的动量交换。根据结果​​，增加燃料温度是增加湍动能的一个因素。同时，不同时间的蒸气体积分数呈现出不同的趋势。关于排放系数，似乎增加流体温度会降低该参数。相反，增加压力梯度导致排出系数的显着增加。似乎增加流体温度会降低该参数。相反，增加压力梯度导致排出系数的显着增加。似乎增加流体温度会降低该参数。相反，增加压力梯度导致排出系数的显着增加。