Study on Heat Transfer and Hydraulic Model of Spiral-Fin Fuel Rods Based on Equivalent Annulus Method
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摘要: 稠密棒束采用了螺旋自定距定位方式。由于棒束排列紧凑,流道比较狭窄,并且引入了螺旋定距物,使得棒束内传热与流动现象相当复杂,尚无合适的模型及关系式来计算其热工水力性能。本文基于Rehme当量环方法,从圆管及圆环内相应模型出发,研究了螺旋定距物对当量环内流道几何及物理性能的影响,推导得到了自定距棒束单相对流换热及水力学模型。将新模型与传统模型关系式进行对比验证,二者符合较好。以此为依据,从理论上将螺旋定距物对热工水力学的影响做了一定的解释。Abstract: Tight lattice fuel assembly usually adopts spiral-fin fuel elements.Compared with the traditional PWR fuel rods,the closely packed and spiral fin spacers make the heat transfer and hydraulic phenomena in sub-channels very complicated,and there was no suitable model and correlation to study it.This paper studied the effect of spiral spacers on the channel geometry in the equivalent annulus and physical performance based on the Rehme equivalent annulus methods,and the heat transfer of the spiral fin fuel rodsand hydraulic model were obtained.The new model was verified with the traditional one,and the verification showed that two new models agreed well,which could provide certain theoretical explanation to the effect of the spiral spacer on the thermal hydraulics.
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Key words:
- Equivalent annulus /
- Spiral-fin /
- Thermal hydraulic /
- Model
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