Experimental Study on Local Two Phase Distributions in ERVC Flow Channel
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摘要: 采用1∶1循环高度的切片实验装置模拟压力容器外部冷却流道,通过向实验段注入空气模拟压力容器外部两相自然循环过程,采用自制电导探针对系统内的局部空泡份额分布进行实验测量和分析。实验结果表明:压力容器外部冷却流道内的两相流具有显著的局部分布特征,流道截面上的局部空泡份额类型从壁面峰值分布类型过渡到近壁面峰值分布类型,最终发展成为中心分布类型;液相和气相流量的敏感性分析表明,气相流量的大小对局部空泡份额分布特征有较大的影响。Abstract: The two-phase flow distribution in the external reactor vessel cooling flow channel shows a significant local feature because of its particular flow structure. In this paper, a slice geometry test section and a 1:1 height scaling experimental apparatus is used to simulate the ERVC flow channel. Air is injected in the test section to simulate the two phase flow phenomena and conductivity probe is used to measure the local void fraction distribution. The test results show that the local void fraction transits from the wall peak distribution to the near-wall peak distribution, and eventually develops into the center peak distribution. The air flow rate has a significant effect on the local void fraction distribution in the flow channel.
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Key words:
- Two phase flow /
- Local void fraction /
- External reactor vessel cooling
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