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Numerical study on subcooled boiling and flashing-induced flow instability under rolling motion   YU Shengzhi1, WANG Jianjun1, YAN Changqi1, and GUO Xueqing1   1. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin, 150001, China (wang-jianjun@hrbeu.edu.cn, changqi_yan@163.com)   Abstract: The natural circulation system is very important to the designs of the reactor systems with passive safety features. When nuclear powered ship sails on the sea, the natural circulation system may be influenced by the ocean conditions. The typical motions of a ship contain rolling, heaving, pitching, inclination, etc. under the ocean condition. In this paper, the mathematical models of the natural circulation system under rolling conditions are presented on the basis of some simplification. The natural circulation characteristics, along with the sub cooled boiling in the heated section and the flashing in the adiabatic riser (the section with up flow where there is no energy exchange with environment.) under rolling motion are studied by self-developed in-house code. The results show that: (1) The oscillating period of intermittent subcooled boiling and flashing-induced flow instability decreases with heat flux increasing when the heated section remains vertical. (2) Under rolling motion condition, the flashing and the sub cooled boiling has been enhanced. (3) The period of the mass flow rate oscillation is about an integeral multiple of the rolling motion period. Keyword:natural circulation; flashing; sub cooled boiling; rolling motion
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