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The proposed twin turbine system consists of a Wells turbine with guide vanes and an impulse turbine for energy conversion from the oscillating airflow. It was hypothesized that by coupling these axial flow turbines together, the pneumatic energy from oscillating airflow was captured by the Wells turbine as main turbine at low flow rate and by the impulse turbine as booster turbine at high flow rate...
Wells turbine has long been used as an energy converter for wave energy conversion because of its simple structure. In order to alleviate the stall problem of this turbine, the authors have proposed a Wells turbine with booster for wave energy conversion. This unique power take-off consists of the Wells turbine for main turbine and a impulse turbine for booster. In the present, the wind-tunnel tests...
This paper investigates the limitations of 2D linear unsteady aerofoil theory for modelling the unsteady gust response of tidal stream turbines. The work is motivated by the fact that accurate unsteady load prediction is required to determine turbine life. Current state of the art design codes in industry use a single model, based on Theodorsen's theory, to predict the response to all types of gust...
A numerical simulation has been carried out to investigate the influences of pressure-side winglet on controlling tip clearance flow in an axial compressor cascade. Emphasis is put on the analysis of effectiveness of pressure-side winglet when the approaching flow is at different incidences (-5°, 0°, +3°). The simulation results show that with the increase of incidence, the region under the effect...
Oscillating water column wave energy converter is widely used in the world. The impulse turbine is recently employed for the bi-directional mechanical air power into electricity power. The 2D and 3D numerical model is established in the present paper to investigation the operating performance. The proper mesh style, turbulence model and numerical solutions are employed to study the velocity and air...
In response to Florida's growing energy needs and drive to develop renewable power, Florida Atlantic University's Center for Ocean Energy Technology (COET) plans to deploy a mooring near the core of the Gulf Stream off southeast Florida's coast. This mooring system testing platform will be used to evaluate the performance of prototype ocean current turbines including COET's 20 kW turbine that is currently...
By way of solving a three-dimensional viscous and compressible Reynolds Navier-Stokes equation, a numerical simulation on the three-dimensional turbulent flow was carried out in the gas turbine cascade for turbo-charger set of marine supercharged boiler. The simulation has been accomplished through the adoption of a full three-dimensional numerical simulation technique and "mixing plane"...
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