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Medientyp:
E-Book
Titel:
Cfd Based Approach for Modeling Condensation-Induced Water Hammer in Equal-Height-Difference Passive Heat Removal System for Ocean Nuclear Power
Beschreibung:
The equal-height-difference passive heat removal system (EHDPHRS) utilizes ocean as ultimate heat sink and the reverse flow of seawater may leading to condensation-induced water hammer (CIWH). In this study, the integration of volume of fluid model and condensation model based on surface renewal theory is used to simulate the CIWH characteristics in the heat removal pipe of EHDPHRS. The interfacial heat and mass transfer are calculated by user-defined functions (UDF). The condensation model is firstly validated with the PMK-2 experimental data, showing consistency with the measured temperature evolutions. The simulation results indicate that the reverse flow of subcooled water triggers the formation of the CIWH, by increasing the condensation rate and forming the steam slug. The reverse flow periodically occurs afterwards, inducing multiple CIWHs. The increase of inlet stream velocity lengthens the reverse flow period and the distance, thus strengthening the interfacial condensation and the pressure impulse of CIWH