目的 探究钢桶气体泄漏的射流流场对桶身激励产生声发射信号的基本原理和特性。方法 利用计算流体力学Fluent软件分析钢桶气体泄漏流场状态，介绍钢桶气体泄漏的射流模型及产生机理，利用计算流体力学有限元方法建立数学模型，建立钢桶泄漏的几何模型和边界条件，设置仿真分析的相关参数，得到不同内压、不同漏孔直径和多漏孔情况下的钢桶泄漏仿真结果，并讨论钢桶泄漏气流速度场、压力场等参数的分布情况。结果 钢桶发生泄漏时的气流速度对声发射信号起主导作用，内压对气流速度影响较大，孔径和漏孔数量带来的影响较小。结论 该分析为探讨钢桶的泄漏机理与声发射激励信号的检测提供了参考。

The work aims to investigate the fundamental principle and characteristics of acoustic emission signal generated by the jet flow field resulting from gas leakage in steel drums that excite the drum body. The flow field state from steel drum gas leakage was analyzed with Fluent software for computational fluid dynamics (CFD). The jet model and mechanism of gas leakage in steel drum were introduced. The mathematical model was built with finite element method for CFD. The geometrical model and boundary conditions of steel drum leakage were established. The relevant parameters of the simulation analysis were set. The simulation results of steel drum leakage were obtained under different internal pressures, different leak diameters and multiple leaks. The distribution situations of airflow velocity fields, pressure fields and other parameters of steel drum leakage were discussed. The results showed that the airflow velocity during the steel drum leakage played a leading role in the acoustic emission signal, and the effect of internal pressure on airflow velocity was large, and the influence of hole diameter and leak quantity was small. The simulation analysis of the flow field from gas leakage of the steel drum provides reference for the investigation on the leakage mechanism of the steel drum and the detection of the acoustic emission excitation signal.