Abstract The scrubbing efficiency of aerosols contained in submerged gas jet in Pressure Suppression Pool (PSP) is important during the severe accident of Nuclear Power Plant (NPP). To analyze the influence of nozzle inlet pressure (from 0.12 MPa to 0.4 MPa) and gas injection direction (horizontal and vertically downward direction) on scrubbing efficiency of aerosols in non-condensable gas submerged jet, several experiments were carried out. The experimental results show that the aerosol scrubbing efficiency increases as the inlet pressure increases. Most of the aerosols in gas are retained in water when the nozzle inlet pressure is higher than 0.2 MPa, and the scrubbing efficiency is lower than 90% under low inlet pressure. The effect of gas injection direction on scrubbing efficiency is significant when the gas flow state at nozzle exit is subcritical flow, but the effect is not obvious when the inlet pressure is higher than 0.3 MPa and the gas flow state at nozzle exit is critical flow.

中文翻译：

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水平和垂直向下浸没式气体射流中所含气溶胶洗涤效率的实验研究

摘要 在核电站（NPP）发生严重事故时，压力抑制池（PSP）中潜入气体射流中所含气溶胶的洗涤效率非常重要。为了分析喷嘴入口压力（从0.12 MPa到0.4 MPa）和气体注入方向（水平和垂直向下方向）对不凝气体浸没射流中气溶胶洗涤效率的影响，进行了多次实验。实验结果表明，气溶胶洗涤效率随着入口压力的增加而增加。当喷嘴入口压力高于0.2 MPa时，气体中的大部分气溶胶滞留在水中，在低入口压力下洗涤效率低于90%。