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采用CATHARE程序对两相自然循环系统的压降震荡流动不稳定进行数值模拟.计算结果表明,两相自然循环系统中,自然循环回路与稳压器之间的压降震荡是导致流动不稳定出现的主要原因.通过限制自然循环回路与稳压器之间的流量波动,可以防止两相自然循环出现流动不稳定.“,”The pressure drop oscillation in two-phase natural circulation system was investigated by CATHARE code.The results show that the pressure drop oscillation was caused by the interaction between the natural circulation loop and the pressurizer in the two-phase natural circulation system.The pressure drop oscillation in two-phase natural circulation system could be avoided by limiting the fluctuating flow.