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A quasi-coupled wind wave experimental framework for testing offshore wind turbine floating systems

Theoretical & Applied mechanics Letters 2021年第5期11卷 280-290页

作者： C.Feist F.Sotiropoulos m.guala Saint Anthony Falls Laboratory College of Science and EngineeringUniversity of MinnesotaMinneapolis MN 55414USA Department of mechanical and Nuclear Engineering Virginia Commonwealth UniversityRichmond VA 23284-2527USA Department of Civil Environmental and Geo-EngineeringCollege of Science and EngineeringUniversity of MinnesotaMinneapolis MN 55455-0116USA

Two sets of experiments in the *** Falls Laboratory(SAFL)wave tank facility and atmospheric wind tunnel are integrated to provide a scaled representation of a floating wind turbine under heave and pitch motions due to ocean *** quasi-coupling is established by controlling the turbine rotor speed to generate a thrust force mimicking steady or fluctuating wind gusts in the wave tank,and by using two actuators to oscillate a miniature turbine in the wind *** pitch and heave motions under varying waves are scaled down using rotor geometry and the wake meandering frequency to study the effect of the floating platform kinematics on the evolution and characteristics of the oscillating turbine *** a limited case of experimental conditions results provide a phenomenological and quantitative description of the floating-turbine system under variable waves and simulated wind ***,we demonstrate that wind gusts contribute to increase the platform pitch range,and that periodic large scale flow patches of high and low momentum flow are generated by the oscillating rotor in the turbulent boundary layer and are coherently convected through the *** mechanisms could amplify the pitch response of downwind floating turbine units within the offshore power plant,in particular if the wave and/or wind forcing frequencies happen to approach the pitch natural frequency of the floating system.

关键词： Wind power Ocean Renewable Turbulent flow

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Effect of Small-Scale Turbulence on the Growth and metabolism of microcystis aeruginosa

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Advances in microbiology 2016年第5期6卷 351-367页

作者： Anne Wilkinson miki Hondzo michele guala St. Anthony Falls Laboratory Department of Civil Environmental and Geo-Engineering College of Science and Engineering University of Minnesota Minneapolis USA

microcystis aeruginosa is a single-celled cyanobacterium, forming large colonies on the surface of freshwater ecosystems during summer, and producing a toxin (microcystin) that in high concentration can be harmful to humans and animals. These toxic effects can be governed by abiotic environmental conditions including water temperature, light, nutrient abundance, and fluid motion. We investigated the effect of small-scale turbulence on the growth and metabolism of microcystis aeruginosa using field measurements and laboratory bioreactor investigations. The laboratory setup included two underwater speakers, generating a quasi-homogeneous turbulent flow with turbulent kinetic energy dissipation rates up to 10-6 m2/s3, comparable to field values in the lacustrine photic zone. The role of turbulence is quantified by comparing cell number, dissolved oxygen production/uptake, and inorganic carbon uptake in stagnant condition and two sets of experiments with turbulent conditions, quantified by the Taylor micro-scale Reynolds number at Reλ = 15 and Reλ = 33. The results suggest that turbulence mediates the metabolism of microcystis aeruginosa measured by the net oxygen production, oxygen uptake, and inorganic carbon uptake. Furthermore, small-scale turbulence marginally influenced microcystis growth rate estimated from cell population concentration (-5% and 11% for Reλ = 33 and Reλ = 15, respectively, as compared to stagnant conditions).

关键词： Harmful Algal Blooms microcystis aeruginosa Cyanobacteria Turbulence metabolic Response microcystin

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