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http://dx.doi.org/10.1016/j.net.2019.05.002

Preliminary numerical study on hydrogen distribution characteristics in the process that flow regime transits from jet to buoyancy plume in time and space  

Wang, Di (School of Mechanical Engineering, Shanghai Jiao Tong University)
Tong, Lili (School of Mechanical Engineering, Shanghai Jiao Tong University)
Liu, Luguo (Key Laboratory of Nuclear Reactor System Design Technology, Nuclear Power Institute of China)
Cao, Xuewu (School of Mechanical Engineering, Shanghai Jiao Tong University)
Zou, Zhiqiang (Key Laboratory of Nuclear Reactor System Design Technology, Nuclear Power Institute of China)
Wu, Lingjun (Key Laboratory of Nuclear Reactor System Design Technology, Nuclear Power Institute of China)
Jiang, Xiaowei (Key Laboratory of Nuclear Reactor System Design Technology, Nuclear Power Institute of China)
Publication Information
Nuclear Engineering and Technology / v.51, no.6, 2019 , pp. 1514-1524 More about this Journal
Abstract
Hydrogen-steam gas mixture may be injected into containment with flow regime varying both spatially and transiently due to wall effect and pressure difference between primary loop and containment in severe accidents induced by loss of coolant accident. Preliminary CFD analysis is conducted to gain information about the helium flow regime transition process from jet to buoyancy plume for forthcoming experimental study. Physical models of impinging jet and wall condensation are validated using separated effect experimental data, firstly. Then helium transportation is analyzed with the effect of jet momentum, buoyancy and wall cooling discussed. Result shows that helium distribution is totally dominated by impinging jet in the beginning, high concentration appears near gas source and wall where jet momentum is strong. With the jet weakening, stable light gas layer without recirculating eddy is established by buoyancy. Transient reversed helium distribution appears due to natural convection resulted from wall cooling, which delays the stratification. It is necessary to concern about hydrogen accumulation in lower space under the containment external cooling strategy. From the perspective of experiment design, measurement point should be set at the height of connecting pipe and near the wall for stratification stability criterion and impinging jet modelling validation.
Keywords
Impinging jet; Buoyancy; Flow regime transition; Hydrogen distribution;
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