A new numerical method for complex two-phase discharge force based on ARSAC program

Dan Wu

doi:10.1016/j.pnucene.2024.105277

2024-08-01

PRE

DOI：10.1016/j.pnucene.2024.105277

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摘要

En 中文

The results of discharge force analysis are important input conditions for stress analysis of discharge systems and pipeline support design. However, due to the complex two-phase flow heat transfer process and the high flow velocity and drastic changes in flow parameters during transient processes, discharge force analysis is very difficult. This article establishes a complete set of methods to obtain the transient loads of all pipelines on the discharge system, including the determination of key physical phenomena during the two-phase discharge process, accurate simulation of complex thermal hydraulic phenomena, establishment of load mathematical and numerical calculation models, and accurate capture of force peak values. The specific content of the article includes: determination of key thermal hydraulic phenomena in complex two-phase flow discharge processes; Develop a thermal hydraulic analysis method for two-phase discharge processes based on ARSAC program, which involves complex phenomena such as two-phase critical flow, rapid flash evaporation, multiple flow regime transitions, and pressure wave propagation; Build mathematical and numerical models for two-phase discharge forces, and capture real-time force peaks during complex two-phase discharge processes. The rationality of the established method was verified through simulation EPRI/CE experiments, and this method was applied to analyze two-phase discharge characteristics of the pressurizer discharge system of third-generation nuclear power plants, including discharge characteristics of one valve mistakenly opening and discharge characteristics of multiple valves opening sequentially. Further research is needed to investigate the quantitative impact of loop seal temperature distribution and loop seal volume on the discharge force. In addition, it is hoped that as optimization work of ARSAC program progresses, the analysis accuracy of discharge force can be improved.

Keyword:

Two-phase

Discharge force

ARSAC

Critical flow

Flow pattern transition