Numerical Study on Boiling Critical Characteristics of Rod Beam Channel Positioning Lattice
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摘要: 为研究核反应堆中定位格架及搅混翼对沸腾临界现象产生的影响,本文采用计算流体动力学(CFD)分析方法,探讨了棒束通道中定位格架的数目、位置和搅混翼的角度对于沸腾临界现象的影响。结果表明:定位格架会对主流流动产生阻力,同时定位格架数目越多,沸腾临界发生的温度也越高,但将定位格架布置在沸腾临界发生位置时,则可有效改善壁面传热环境并降低沸腾临界发生时的峰值温度。搅混翼的存在则会有效降低加热面附近空泡份额,改善传热环境,但搅混翼角度过大时会导致沸腾临界提前发生。Abstract: In order to investigate the influence of the spacer grids and mixing vanes on boiling crisis in nuclear reactor, the effects of number, location of spacer grid and bending angle of mixing vane on the flow and heat transfer in rod bundle are studied by using the computational fluid dynamics(CFD) analysis method. The results show that the spacer grid will cause resistance to the mainstream flow, and the peak temperature value is increased along with the number of spacer grid. However, the peak value of temperature can be restrained to a certain degree when the spacer grid is arranged in the position where boiling crisis occurs.. The mixing vane can decrease the void fraction in near wall region to improve the heat transfer effectively. But the mixing vane with too large bending angle will bring the boiling crisis in advance.
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Key words:
- Rod bundle channel /
- Spacer grid and mixing vane /
- Critical heat flux /
- CFD simulation
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