快堆二回路钠泵叶轮与导叶叶片数设计探讨

快堆二回路钠泵是目前世界上最先进的第四代核电核心装备之一,在保证安全运行的条件下提升其运行效率至关重要.基于其原型样机的性能要求和限制尺寸,采用一元设计与CFD相结合的方式进行钠泵叶轮和导叶的水力设计并且探究钠泵叶轮叶片数与导叶叶片数的匹配规律.结果表明:只改变导叶叶片数时,不同的导叶叶片数对钠泵效率和扬程影响的最大差值分别为4.01 %和9.75%的设计参数.设计工况下钠泵叶轮与导叶叶片数的最佳匹配值为:叶轮叶片数为5、导叶叶片数为8,叶轮叶片数为6、导叶叶片数为9,叶轮叶片数为7、导叶叶片数为11,即导叶叶片数在叶轮叶片数的1.5倍附近时,泵的水力性能达到最优值.符合钠泵性能要求且水力性能最优的叶轮叶片数与导叶叶片数的匹配方案为:叶轮叶片数为6、导叶叶片数为11.

Design exploration of blade number of impeller and guide vane of sodium pump in secondary circuit of fast reactor

The sodium pump in secondary circuit of fast reactor is one ofkey equipment of the most advanced fourth-generation nuclear power in the world at present. It is very important to improve pump efficiency under the conditions of safe operation. Hydraulic design of the pump was carried out bycombining one-dimensional design method with computional fluid dynamics(CFD) based on its performance requirements and dimensional limitation and the matching rules of the blade number of the pump impeller and guide vane were discussed. The results show that the maximum influences of blade number of guide vane on its efficiency and head are 4.01% and 9.75% of their designing values, respectively, when the blade number of the impeller is kept constant. The optimal matching ratio of the blade number of impeller and guide vane for each other under designing condition is 5∶8, or 6∶9, or 7∶11, namely, the pump hydraulic performance reaches its optimal value when the matching ratio is about 1∶1.5. Nevertheless, the matching ratio of blade number of impeller and guide vane is at 6∶11, the sodium pump gets the best hydraulic performance.