Abstract In view of the importance of the condensation-induced water hammer in various engineering fields, this study performed an analytical modeling and numerical simulation to obtain the map of the onset of the condensation-induced water hammer. Two linear boundaries were experimentally observed for the transitions between no condensation-induced water hammer and non-periodic condensation-induced water hammer and between non-periodic condensation-induced water hammer and periodic condensation-induced water hammer. The analytical modeling based on the energy balance equation was conducted to derive the onset of the condensation-induced water hammer. The analytical model suggested that the map of the onset of the condensation-induced water hammer could be displayed by two essential non-dimensional parameters, such as modified Jakob number and Froude number. The model indicated that the slope of the boundary of the onset of the condensation-induced water hammer was the product of modified Stanton number, non-dimensional interfacial area concentration, and non-dimensional temperature difference. The model could predict the boundaries between no condensation-induced water hammer and non-periodic condensation-induced water hammer and between non-periodic condensation-induced water hammer and periodic condensation-induced water hammer satisfactorily. The one-dimensional nuclear thermal-hydraulic system analysis code, RELAP5, was used for simulating the onset of the condensation-induced water hammer. The obtained boundary corresponded to the experimentally obtained boundary between non-periodic condensation-induced water hammer and periodic condensation-induced water hammer.

中文翻译：

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凝结水锤开始的建模与仿真

摘要 鉴于冷凝水锤在各个工程领域的重要性，本研究通过分析建模和数值模拟，获得了冷凝水锤发生的图。通过实验观察到无凝结水锤和非周期性凝结水锤之间以及非周期性凝结水锤和周期性凝结水锤之间的转变的两个线性边界。进行基于能量平衡方程的分析建模以推导出冷凝引起的水锤的发生。分析模型表明，冷凝引起的水锤开始的地图可以通过两个基本的无量纲参数来显示，如修正的雅各布数和弗劳德数。该模型表明，凝结水锤开始的边界斜率是修正的斯坦顿数、无量纲界面面积浓度和无量纲温差的乘积。该模型能够较好地预测无凝结水锤与非周期性凝结水锤之间以及非周期性凝结水锤与周期性凝结水锤之间的边界。一维核热工水力系统分析程序 RELAP5 用于模拟凝结水锤的发生。