【摘要】 通过实验研究了一体化自然循环反应堆压力壳上部自稳压气空间对于自然循环两相流系统启动过程中流动稳定性的影响。实验结果表明，较小的气空间有利于抑制流量振荡。依此提出在反应堆启动过程中提高流动稳定性的新途径：首先在较小的气空间体积下开始启动，当达到额定热工参数后再将多余的水放出达到所需要的正常运行状态更多还原

【Abstract】 The influence of the gas space on the top of an integral reactor vessel on the flow stability in the start up process of a natural circulation two p hase flow system is studied experimentally. Experimental results show that a sma ller gas space is advantageous to restraining the flow oscillation in start up pro cess. According to this, a new way to improve the flow stability in start up pr ocess is proposed.更多还原