Hydrodynamics of an oscillating water column seawater pump. Part II: tuning to monochromatic waves

On the tuning of a wave-energy driven oscillating-water-column seawater pump to polychromatic waves

“…It can also be seen in figure 8, that the resonant volume, as defined by the maximum average flow rate is, for all sill heights, always smaller than the V o Lin for the maximum period component. This is consistent with the monochromatic experiments of Czitrom et al (2000b) who observed that pumping shifts the actual resonant volume to smaller values than the linearized model prediction. Similar to the monochromatic case, greater pumping induces a greater shift towards smaller resonant air chamber volumes.…”

“…1. Schematic diagram of the seawater pump (from Czitrom et al, 2000b) An OWC wave energy device intended for sea-water pumping, involving no generation of electricity, has been described by Czitrom et al (2000a,b). The system has potential for various coastal management purposes, such as aquaculture, flushing out of contaminated areas or the recovery of isolated coastal lagoons as breeding grounds.…”

“…2. Representation of the pump as a damped two-mass two-spring oscillator (from Czitrom et al, 2000b) V 0 is the compression chamber volume, H is the height of the equilibrium position of the free surface in the compression chamber above the receiving body of water and c D1,2 is a coefficient of nonlinear losses including vortex formation, friction and radiation damping. L 1 and T d are referred to the equilibrium position on the exhaust side of the compression chamber.…”

“…The numerical model was used by Czitrom et al (2000b) to obtain a tuning algorithm for monochromatic waves for the fully operational system. This algorithm renders an optimal volume of air for the compression chamber (V 0 ), in terms of the wave period and amplitude and the tidal elevation.…”

Flushing of the port of Ensenada using a SIBEO wave-driven seawater pump

“…The pump equations were derived by applying the Bernoulli equation to streamlines in the resonant and exhaust ducts and adding terms for the losses due to viscosity, vortex formation and radiation damping [Czitrom 1997;Czitrom et al 2000a]. A numerical model of the SIBEO, which solves the pump equations, reproduces 1:25 scale wave tank test data remarkably well [Czitrom et al 2000b]. A SIBEO prototype was temporarily installed and field tested on the coast of Oaxaca, Mexico, with the help of a fisherman's cooperative [Czitrom 1996;.…”