气动除雾系统常用于大型机组润滑油雾的分离，而文丘里管是气动除雾系统的核心部件。为研究文丘里管在气动除雾系统中的性能，首先基于数值计算方法分析入口压力、背压及油箱尺寸对文丘里管内压力和传热影响规律，并通过实验验证了数值计算方法的准确性。然后实验研究了文丘里管内负压、温降及出口液滴粒度的规律。结果表明：文丘里管入口压力越大、出口背压越小，文丘里引射管产生负压越大。影响文丘里抽吸系统温降的主要因素是油箱容积和环境温度，油箱容积越大，温降越大；环境温度越高，出口温度越高。在文丘里管扩压段位置，液滴团聚效果大于破碎效果，小液滴聚并成大液滴。

The pneumatic defogging system is applied to the separation of lubricating oil fog in large units, and the Venturi tube is the core component of the pneumatic defogging system. In order to study the performance of Venturi tube in pneumatic fog removal system, firstly the influence of inlet pressure, back pressure and tank size on pressure and heat transfer in Venturi tube was analyzed based on numerical calculation method, and the accuracy of numerical calculation method was verified through experiments. Then, the rule of negative pressure, temperature drop in Venturi tube and droplet size at outlet were studied experimentally. The results show that the greater the inlet pressure and the smaller the outlet back pressure, the greater the negative pressure of Venturi ejector tube. The main factors affecting the temperature drop of Venturi suction system are tank volume and ambient temperature. The larger the tank volume, the greater the temperature drop. The higher the ambient temperature, the higher the outlet temperature. At the diffuser section of Venturi tube, the agglomeration effect of droplets is greater than the breaking effect, and small droplets gather and form large droplets.