正三角配列円柱群の流れ方向流力弾性振動に関する研究

抄録

In-flow fluidelastic instability of tube arrays subjected to crossing flow is recently highlighted due to a practical problem occurred in 2012. Some features of this phenomenon have been revealed by some published papers. Parallel triangular arrays are found easy to occur this instability, but it can be hardly observed for square arrays. Then, next question is how about for normal triangular arrays. This study focuses on the phenomena in normal triangular arrays, which is usually observed in many heat exchangers. The pitch to the diameter ratio, P/D, are changed in three patterns, P/D=1.2, 1.33, and 1.5. In each pattern, the measured flexible direction is changed in two directions . The results are different from the ones for parallel triangular arrays, and they are similar to the ones for square arrays.