In order to obtain the influence of rolling motion condition on the natural circulation flow stability,the natural circulation loop experimental system with a rod bundle heating channel is used to carry out a comparative experimental study of flow instability under static and rolling conditions.The experimental results show that the flow instability existing in the rod bundle channel is density wave oscillation(DWO).An empirical correlation for the DWO boundary prediction at low pressure NC condition is obtained.Two typical two-phase flow instabilities in rod bundle channel under rolling condition are found in experiments:the trough-type oscillation caused by the vapor generation at the lowest point of flow fluctuation and the compound oscillation formed by the superposition of the trough-type oscillation and DWO.The evolution law of flow instability behavior of natural circulation under the influence of rolling as well as its instability boundary are also obtained.
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