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核反应堆余热排出过程中蒸汽与过冷水在管内发生直接接触凝结,有时会产生严重的凝结水击(CIWH)现象.对水平管内CIWH现象进行了实验研究,研究发现CIWH会引起巨大的压力波动,而且CIWH发生后会周期性出现逐渐衰减的压力峰值信号.分析CIWH发生过程中管路轴向不同位置处压力变化,发现压差的存在诱导了CIWH的产生.120 s内有多个CIWH事件产生,其强度具有高度随机性,最后发现CIWH强度最大值随进汽量的增加而增加,最高可达10 MPa.“,”Serious steam condensation induced water hammer (CIWH) phenomenon would occure when the steam directly contacts with the water during the residual heat removal process for nuclear reactors. In this paper, CIWH phenomenon was investigated experimentally in a horizontal pipe. Firstly, it was found that CIWH would cause a high pressure peak, and there periodically appeared decaying pressure peaks after CIWH event. Besides, the existence of pressure difference for different positions promoted CIWH event by analyzing pressure fluctuation of different axial positions. Finally, multiple CIWH events occurred during 120s, but pressure fluctuation intensity had a high randomness. The maximum value of pressure fluctuation intensity increased with steam mass flux increasing with a maximum value of 10 MPa.