环形通道内再淹没过程骤冷前沿推进速度实验研究

骤冷前沿推进速度是衡量失水事故中再淹没过程堆芯冷却效率的重要参数之一。本文通过实验研究了竖直环形通道内骤冷前沿的推进特性，获得初始壁温、入口温度、入口质量流速及加热功率对骤冷前沿推进速度的影响。实验结果表明，骤冷前沿推进速度随初始壁温、入口温度和加热功率的增加而减小，随入口质量流速的增加而增加。 

Experimental Study on Velocity of Quench Front during Reflooding Process in a Vertical Annual Channel

Velocity of quench front is one of the important parameters which measure the cooling efficiency of?the?reactor core during the reflooding?process after loss of coolant accident. Based on an experimental study of propulsion characteristics of quench front in a vertical annual channel, the effects?of initial clad temperature, inlet coolant temperature, inlet mass flow flux, and heating power on the velocity of quench front were investigated. The results show that the velocity of quench front decreases with the increasing?of the?initial wall temperature, inlet coolant temperature as well as heating power,?but increases with the increasing of the inlet mass flow rate.