Hydrodynamics of an oscillating water column seawater pump. Part II: tuning to monochromatic waves |
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| Authors: | S P R Czitrom R Godoy E Prado A Olvera C Stern |
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| Institution: | a Instituto de Ciencias del Mar y Limnología, UNAM, Circuito Exterior S/N, Ciudad Universitaria, 04510 México D.F., Mexico;b Instituto de Investigación en Matemáticas Aplicadas y Sistemas, UNAM, Ciudad Universitaria, 04510 México D.F., Mexico;c Facultad de Ciencias, UNAM, Circuito Exterior S/N, Ciudad Universitaria, 04510 México D.F., Mexico |
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| Abstract: | Flume experiments with a scale-model of a wave driven seawater pump in monochromatic waves are described. A tuning mechanism optimises the pump performance by keeping it at resonance with the waves. The pumping process itself was found to de-tune the system because of the reduced gravity restoring force due to spilling in the compression chamber. A perturbation analysis of the pump equations shows that performance of the system can be increased by optimising the shape of the pump intake to minimise losses due to vortex formation. An algorithm is derived, using a numerical model of the pump, which accurately determines the required volume of air in the compression chamber to induce resonance given variations in the wave frequency, the wave height and the tides. A sustainable development project to use a seawater pump to manage fisheries at a coastal lagoon in Mexico is described. |
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| Keywords: | Waves Pump Resonance Coastal management |
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