Flow Distribution Research In Complex Structure Of WCSB Blanket Sub-module

Water Cooled Solid Blanket has stronger theory basic and research value in comparison to the other two schemes among the design concepts about Chinese Fusion Experiment Test Reactor.One of them is WaterCooled Solid Blanket in which solid pebble is playing a role of tritium breeder and PWR water is working as coolant to remove the nuclear heat from reactor,shield layer to prevent radiation and tritium breeder.One of the essential tasks for thermal performance design is blanket module which has two symmetrical sub-modules.Each sub-module is consist of a large number of complex multi-tubes which often makes problem about flow distribution between parallels.It may raise risk of securely heat removing of primary cooling system.Therefore,the mass-flow uniformity in parallels should be taken into account.To begin with,the First Wall and Side Wall in WCSB sub-module is preliminarily designed.For getting flow characteristics of coolant and take in-depth study about the inlet manifold,The flow distribution at the FW and SW multi-channels is researched by using the ANSYS CFX.In order to analyze the impact of different geometric constructions to the flow distribution in parallels,it is started with three aspects including section shape,coolant inlet orientation and multi-channels’ position on manifold.Results show that in the FW it is advantageous for flow uniformity to choose the rectangle section shape inlet manifold and coolant inlet orientation which is perpendicular to inlet manifold.In the SW flow distribution will be more smooth on condition that inlet manifold has a high value of aspect ratio.Afterwards,a preliminary study on external heat flux and flow decay of the FW is carried out.According to the results,the nuclear heat on WCSB blanket sub-module is removed effectively and keeps the maximum temperature of coolant under the material limit.In addition,on condition of LOFA,the construction of the FW will not raise a flow pulsation between parallels which dues to the flow transient.After simulation about the FW and SW,a flow distribution experiment facility is designed referred to the PWR nuclear power plant.Then preliminary test research is carried out on 15-tubes FW and 10-tubes SW.Finally,a integrated 29-tubes FW test section is designed based on the similarity theory.It provides a support for later research.