Tube-to-tube ties and their arrangement within the tube array are shown to affect the onset of fluidelastic instability. The influence of tie arrangement for a single tube row and for an in-line tube array is obtained by numerical simulation using S.S. Chen’s unsteady flow theory. Maps of dimensionless critical velocities for groups of tubes consisting of 2, 3, 4 and 5 tubes tied to each other are developed for several design configurations. It is shown that the stability limits can be raised by appropriate choice of tube group and tie location.

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