依据航空发动机适航规章中吸雨条款要求，对某无增压级风扇部件开展吸雨特性研究，用拉格朗日方法追踪不同水滴初始速度下其在风扇中的运动轨迹，获得了发动机内涵进水量，探讨了涡扇发动机在吸雨适航符合性验证中对喷水装置的喷水速度的要求，以支撑中国涡扇航空发动机吸雨适航符合性设计与验证。研究发现，某慢车转速下随着水滴速度的减小，撞击在风扇叶片等壁面上的雨水流量增大，且没有水滴能够穿过风扇叶片直接进入内涵，当水滴速度为250 m/s时，内涵进水量占总雨水流量的15.3%，为10 m/s时的19.1倍；在同一水滴速度下，随着分流环与风扇叶片间距的减小，内涵进水增加率增大；不同转速下，内涵进水量随风扇进口水滴初始速度的变化趋势是一致的，基本随着水滴速度的增大先增大后保持不变甚至略微减小。

According to the requirements of rain ingestion of airworthiness regulations, the rain ingestion calculation was carried out for the no booster fan part. The movement trajectory of water droplets with different water speeds was studied based on Lagrangian particle tracking, and the separation amount of water droplets ingested to inner duct was obtained. Further more, the requirements for water spray speed from the rain ingestion test rig in the certification for turbofan engine was discussed, which can support the design and verification of rain ingestion airworthiness of turbofan engine. The results show that with the decrease of water speed, the amount of rain impacting on the fan blade and other walls increases, and no water droplets can pass through the fan blade and enter the inner duct. The water entering the engine inner duct at 250 m/s is 15.3 percent of the total amount of water, about 19.1 times of that at 10 m/s. Under the same water velocity, as the distance between the splitter and the fan blade decreases, the increase in water ingested to inner duct increases. At different fan rotational speeds, the change trend of the water ratio ingested to inner duct with initial water velocity is consistent, basically increasing with the increase in water drop velocity, and then remaining or slightly decreasing.