针对压力管道裂纹泄漏的计算流体力学（computational fluid dynamics, CFD）计算问题，提出了一种可考虑流体压降相变过程的CFD裂纹泄漏计算方法。在理论分析和数值模拟方法研究基础上，建立矩形窄缝裂纹模型，实现了裂纹泄漏过程的瞬态模拟，并进行了计算结果的验证和分析。结果表明，泄漏流体的流动特性符合相变泄漏过程的物理规律，计算结果与试验结果符合性良好，平均误差在15%以内；单位面积泄漏率随裂纹张开位移的增加而增加，随流体过冷度的增加呈现增幅趋缓的增加。所提出的计算方法和分析结果可为压力管道裂纹泄漏率研究提供直接的技术参考。

Aiming at the CFD (computational fluid dynamics) calculation of pressure pipeline crack leakage, a CFD crack leakage calculation method that can consider the pressure drop and phase transformation process of fluid was proposed. Based on theoretical analysis and numerical simulation methods, a rectangular narrow crack model was established to achieve transient simulation of the crack leakage process, and the calculation results were verified and analyzed. The results show that the flow characteristics of the leaking fluid conform to the physical laws of the phase change leakage process, and the calculated results agree well with the experimental results, with an average error of less than 15%. The leakage rate per unit area increases with the increase of crack opening displacement, and increases more slowly with the increase of fluid subcooling. The calculation method and analysis results can provide a direct technical reference for the study of pressure pipeline crack leakage rate.