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对两相自然循环系统的压降震荡流动不稳定起始点进行研究。实验研究发现当实验本体流体出现充分发展的过冷泡核沸腾后,由于汽泡大量产生,以及稳压器上部在可压缩气体的作用下,自然循环回路与稳压器之间出现波动流量,自然循环系统出现压降震荡型流动不稳定。Bowring模型和Saha-Zuber模型预测实验本体出口发生充分发展欠热泡核沸腾的功率值与与自然循环系统的压降震荡流动不稳定起始点功率实验数据的偏差在8%以内。因此,充分发展的过冷泡核沸腾起始点可认为是自然循环系统的压降震荡流动不稳定起始点。
The starting point of instability of pressure drop oscillation in two-phase natural circulation system is studied. Experimental results show that when the experimental bulk fluid appears fully developed subcooled nucleate boiling, due to a large number of bubble generation, and the upper part of the regulator in the role of compressible gas, the natural circulation loop and regulator fluctuate flow, Natural circulation system pressure drop shock-type flow instability. Bowring model and Saha-Zuber model predict that the deviation between the power value of full-blown nucleate boiling at the exit of the experiment body and the experimental data of the starting point of the pressure drop oscillating flow instability in the natural circulation system is within 8%. Therefore, the fully developed onset of undercooled nucleation can be considered as a starting point for the instability of pressure drop oscillations in a natural circulation system.