安全注水时环腔含汽率对压力容器近壁流体温度的瞬态变化的影响

Influence of Void Fraction on the Transient Near Wall Temperature Change of RPV under Safety Injection

安全注水时反应堆压力容器中的热工水力特性与反应堆安全密切相关。本文在1/10的模型上进行了环腔含汽率对高温高压下安注时的压力容器近壁流体温度变化的影响的实验;针对3个热冲击敏感区域的部分测点,分析了不同含气率对下降环腔内近壁流体的瞬态混合特性的影响。结果表明:环腔内没有流动时,含汽率对于混合函数较大影响;安注流速较高时,含汽率的影响大大降低;环腔内有流动时,环腔内流体含有少量汽体,对混合函数的影响很小。

The thermal/fluid characteristic of reactor pressure vessel is a critical issue related to the reactor safety. In this paper, an experiment is carried out to study the influence of void fraction on the transient near wall temperature change under high pressure and temperature on a 1/10 scaled model. For some measure points in three sensitive regions to the thermal shock, the transient near wall temperature mixing characteristics under different void fraction are obtained and analyzed. The results shows that the β will affect θ remarkable when there is no loop flow especially at lower injection flow rate; when there is flow in downcomer the βwill have little effect on the θ.