Experimental Tests for Suppression Effects of Water Restraint Plates on Sloshing of a Water Pool

Abstract

Forced vibration tests for a spent fuel storage pool of nuclear facilities [1] were conducted for the purpose of determining sloshing suppression effects. The devices reported in this paper are cantilever-type water restraint plates. They reduce sloshing and also prevent overflow of water from the pool. Parameters examined in the experimental tests were the installation height levels, lengths and shapes of the water restraint plates. The most effective installation conditions of these water restraint plates were found through the tests.

A Standing-Wave-Type Sloshing Absorber to Control Transient Oscillations

“…Similar ba%es were investigated earlier by Muto et al [4] where the purpose was to suppress the liquid sloshing when the liquid container was excited by external means. An earlier study of the authors also demonstrated the e!ectiveness of this particular geometry to suppress sloshing [7].…”

“…Bass et al [17] used Froude and Euler scaling to conduct experiments for liquid sloshing of 1/30th to 1/50th size of prototype tanks containing lique"ed natural gas. Muto et al [4] also used Froude scaling to represent liquid sloshing in a prototype tank with a 1/30th scale model using water as the working #uid. The di!erence between the present work and the earlier applications, is that here the displacement of the system container is governed by signi"cant #uid}oscillator interaction, and there is strong interaction between the sloshing liquid and ba%e plates.…”

“…Hayama and Iwabuchi [3] suggested an inverted U-tube to suppress sloshing. Muto et al [4] used strategically placed submerged blocks and plates in the container. Hara and Shibata [5] used an active control approach.…”

Experiments to Control Sloshing in Cylindrical Containers

“…Hayama and Iwabuchi [2] used the momentum of liquid in an inverted U-tube to suppress sloshing. Reference [3] used submerged blocks and plates placed strategically in a container to successfully suppress sloshing. The disadvantage of these approaches is that suppression occurs at a critical liquid height, and therefore, variation in liquid height reduces the e!ectiveness of the controllers.…”

State space modeling and active control of slosh

“…To mitigate these effects, a variety of techniques have been proposed, including the use of baffles and dampers, see for example, [6]. These techniques are inherently passive in nature since energy dissipation is the primary goal.…”