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弯径比对HTR-10内90°弯头中氦气流动特性的影响

DOI: 10.11990/jheu.201412060

Keywords: 10 MW高温气冷堆, 90°弯头, 弯径比, 数值模拟, 氦气, 流动特性

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Abstract:

10 MW高温气冷堆(HTR-10)直接利用蒸汽发生器内的90°弯头结构对氦气流量进行测量,为了保证反应堆的安全性与经济性,结合实验和数值模拟的方法研究了不同弯径比条件下90°弯头内流体流动特性。依据弯头内、外弧面压力分布的实验结果对CFD计算模型的可信性进行了验证,并针对高温气冷堆蒸汽发生器内的工况,计算了不同弯径比条件下90°弯头处氦气的流动特性。对比实验结果和CFD模拟结果可发现,当管道直径一定时,弯头内、外弧面的压力呈现明显的不均匀分布现象,弯径比越小,内、外弧面的压差越大,压力分布的变化速率也越快。对于相同弯曲角度处截面上的压力分布来说,弯径比越小,压力分布的变化速率越大。

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