汽车脱附系统里的文丘里管是一种能够利用流体动力学原理实现气体混合与传输的装置，其结构参数优化对于改善车辆排放性能尤为重要。运用数值仿真技术，分析了车用文丘里管内部的流体力学特性，并探索关键结构参数对其流动特性和工作效率的影响机制，其中关键结构参数包括混合管长度、驱动喷嘴与混合管直径之比（d_mr/d_td）、推力间距、扩散器直径及扩散器角度等。结果发现，以上参数均对文丘里管的抽吸性能与工作效率有显著影响。针对不同驱动压力区间，详细阐述了各参数的影响规律，并提出了优化策略。

The venturi tube in the automotive desorption system is a device that utilizes fluid dynamics principles to achieve gas mixing and transmission. Optimizing the structural parameters is particularly crucial for improving vehicle emission performance. By employing the advanced numerical simulation technology, the fluid dynamic characteristics within the vehicle venturi tube was analyzed and the influence mechanisms of key structural parameters on flow characteristics and operational efficiency were explored. These parameters included mixing tube length, the ratio of drive nozzle diameter to mixing tube diameter (d_mr/d_td), thrust gap width, diffuser diameter and diffusion angle. The results indicate that all parameters significantly influence the suction performance and operational efficiency of the venturi tube. Detailed influence patterns for each parameter across different driving pressure ranges are elaborated, along with proposed optimization strategies.