Abstract
Turbulence-induced fluid dynamic forces acting on a cross-shaped tube bundle in a cross-flow were measured in high Reynolds condition with 1/2 scale model of practical plant. The following results were obtained. (1) Vortex-induced vibration may not occur in case of cross-shaped tube bundle in dense arrangement. (2) The Power spectral density of the fluid dynamic forces in drag, lift and torsion direction has similar characteristics. (3) Nondimensional PSDs of the fluid dynamic forces are hardly dependent on Reynolds number Re in case that Re is less than one million. The correlation equation of the turbulence-induced fluid dynamic force in torsion direction is proposed. The estimated amplitudes of the turbulence-induced vibration in torsion direction by the correlation equation coincide with those of the experimental results obtained by free-oscillation tests.
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