Abstract
Experiments on flow-induced vibrations using a closely-packed triangular rod array with a pitch-todiameter ratio of 1.1 in water cross-flow was carried out at Paul Scherrer Institute. The bundle consists of 21 row of five rods in each one. Single flexibly-mounted test rod (TR) is in the fourth row in an otherwise fixed array. The test rod can freely move in the transverse and in-line direction. Two accelerometer sensors were attached at both ends of the TR to measure the rod response on the fluid flow. The effect of flow rate on the stability of the flexibly-mounted TR has been analysed. During experiments, it reveals a set of conditions and tendencies for the flow-induced vibration in the closely-packed multi-rod system.
Highlights
Experiments on flow-induced vibrations using a closely-packed triangular rod array with a pitch-todiameter ratio of 1.1 in water cross-flow was carried out at Paul Scherrer Institute
The mock-up of SINQ target with single flexiblymounted test rod (TR) in an otherwise rigid triangular rod array, with a pitch-to-diameter ratio of 1.1 has been used to experimentally study the flow-induced vibrations (FIV) due to the water cross-flow
The Power Spectral Density (PSD) where the power is normalized by the frequency resolution is used in the frequency domain analysis
Summary
The experimental installation was developed at PSI. It consists of rectangular water channel with 21 row of rigid, cylindrical stainless steel rods. Qmax, in the channel inlet is 2.9 l/s or 2.06 m/s. The Reynolds number based on the maximum inlet velocity U∞ and cylinder diameter d is 16454. The mean gap flow velocity (1) at maximum inlet velocity corresponds to Reynolds number of 181280. In the water flow in the rod bundle is fully developed turbulence. The coordinate system (Cartesian) is defined such that the x-axis points in the direction of the flow, the y-axis in the perpendicular direction and the z-axis is the axis of the rod and is pointing out of the plane in the longitudinal direction of the rod. The origin of the coordinate system is in the centre of the oscillating rod
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