Abstract The pressurized CO2 pipeline is a necessary component of Carbon Capture and Storage (CCS) infrastructures. However, the potential risk caused by CO2 pipeline is still not very clear. Especially the scientific community is focusing on the understanding of multi-phase (gas-liquid-solid) flow of CO2 jet in the near-field of dispersion. In this paper, a compressible multi-phase Computational Fluid Dynamics (CFD) model considering real gas behavior is developed to predict the strength of source terms of CO2 release. The model is based on a Homogeneous Relaxation Model (HRM) and accounts for non-equilibrium phase transition. A CO2 release experiment was carried out to obtain near-field data, and it was used to validate the CFD model. The results show that the predictions are in good agreement with the experimental data in terms of velocity and jet structure. The relaxation time has a significant impact on the jet temperature and the condensed phase fraction.

中文翻译：

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超临界 CO2 管道释放后多相 CO2 射流的均相弛豫模型

摘要 加压二氧化碳管道是碳捕集与封存（CCS）基础设施的必要组成部分。然而，CO2管道带来的潜在风险目前还不是很清楚。尤其是科学界正在关注弥散近场中CO2射流的多相（气-液-固）流的理解。在本文中，开发了一种考虑真实气体行为的可压缩多相计算流体动力学 (CFD) 模型来预测 CO2 释放源项的强度。该模型基于均质松弛模型 (HRM)，并考虑了非平衡相变。进行了CO2释放实验以获得近场数据，并用于验证CFD模型。结果表明，在速度和射流结构方面，预测与实验数据非常吻合。弛豫时间对射流温度和凝聚相分数有显着影响。