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Fluidelastic instability of a tube array in two-phase cross-flow considering the effect of tube material

机译:考虑管材料影响的两相错流管阵列的流体弹性不稳定性

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Fluidelastic instability of a tube array is a key factor of the security of a nuclear power plant. An unsteady model of the fluidelastic instability of a tube array subjected to two-phase flow was developed to analyze the fluidelastic instability of tube bundles in two-phase flow. Based on this model, a computational program was written to calculate the eigenvalue and the critical velocity of the fluidelastic instability. The unsteady model and the program were verified by comparing with the experimental results reported previously. The influences of void fraction and the tube's material properties on the critical velocity were investigated. Numerical results showed that, with increasing the void fraction of the two-phase flow, the tube array becomes more stable. The results indicate that the critical velocities of the tube array made of stainless are much higher than those of the other two tube arrays within void fraction ranging from 20% to 80%.
机译:管阵列的流体弹性不稳定性是核电厂安全的关键因素。建立了两相流管阵列的流体弹性失稳的非稳态模型,以分析两相流中管束的流体弹性失稳。基于该模型,编写了一个计算程序来计算流体弹性不稳定性的特征值和临界速度。通过与先前报道的实验结果进行比较,验证了非稳态模型和程序。研究了空隙率和管材性能对临界速度的影响。数值结果表明,随着两相流空隙率的增加,管阵列变得更加稳定。结果表明,由不锈钢制成的管阵列的临界速度在空隙率从20%到80%的范围内远高于其他两个管阵列的临界速度。

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