水锤效应分析数值模拟方法研究
Research on Numerical Simulation Method of Water Hammer Effect Analysis
水锤效应一直是核电厂热工安全所关注的重要问题之一。准确获得水锤效应下压力波的传播数据对结构载荷分析和评价至关重要。目前，常见水锤分析程序多采用的是特征线法（Method Of Characteristics，MOC），但其在处理多管道复杂系统和捕捉不连续性方面存在一定的计算误差。而有限体积法（Finite Volume Method, FVM）在计算复杂系统水锤问题上存在优势，典型程序为RELAP5。对此，本文基于FVM初步开发了一款水锤压力波传播分析程序。具体，针对单相水锤问题，发展了一种“汽-液”可压缩两流体三方程模型，并采用了以压力迭代为核心的时间步分割三步算法，对于单相水锤问题而言，本文开发的程序比RELAP5相关模型及算法更精炼、高效。通过单相水激波管基准例题开展了程序验证，具体将新开发程序的模拟结果与RELAP5程序结果和解析解进行对比。结果表明，新开发的程序在模拟水锤压力瞬变时数值耗散相对较低，初步验证了模型和算法的可行性和准确性。相关研究成果可为核电厂反应堆水锤分析与评价提供一定的理论与方法学支撑。
水利工程基础科学
水锤效应可压缩流动压力波传播程序开发单相水激波管
余光辉,严钰淋,辜峙钘,宋天鑫,龚政宇.水锤效应分析数值模拟方法研究[EB/OL].(2025-05-07)[2025-09-18].https://chinaxiv.org/abs/202505.00053.点此复制
[Background]: The generation of water hammer is usually accompanied by significant pressure fluctuations. Excessively high pressure poses a challenge to the structural integrity of the reactor. Accurately obtaining pressure wave propagation data under the water hammer effect is crucial for conducting structural load analysis and assessment. [Purpose]: This study aims to conduct method research on the pressure wave propagation of single-phase water hammers, and a pressure wave propagation analysis code for a one-dimensional single-phase water hammer was developed. [Methods]: The typical single-phase water shock tube benchmark example was adopted as the verification object. Firstly, node sensitivity was analyzed using the newly developed code. Based on the sensitivity analysis results, the pressure and velocity distributions in the shock tube at two distinct time instants were analyzed and validated with the simulation results obtained from the RELAP5 code and the analytical solution. [Results]: The results show that the simulation results of the newly developed code are in good agreement with those of the RELAP5 code and the analytical solution overall, and the smoothing effect of the newly developed code is relatively small, with the results being closer to the analytical solution. [Conclusions]: This new code can accurately simulate the pressure transient of a one-dimensional single-phase water hammer.
Water hammer effectCompressible flowPressure wave propagationProgram developmentSingle-phase water shock tube
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