[PDF] Top 20 Development of a contra-rotating tidal current turbine and analysis of performance

... With rotor 1 stalled (Figure 14) disturbances to rotor 2 should occur 3 times per revolution, and this effect is clearly visible for both thrust and edge loads. The interesting feature is the magnitude of cyclic thrust ... See full document

... the development of mathematical models, though its application in large-scale distributed systems is very ...of performance indicators in accordance with the response to systems controlled by a variety of ... See full document

... hydrodynamic performance of the vertical axis twin-rotor tidal current ...stand-alone turbine and twin rotors are compared from three different aspects, including blade forces, power output ... See full document

... hydrodynamic performance of such a ...the tidal turbine on the platform in terms of frequency domain was considered as added mass and ...the tidal turbine was obtained by ...second ... See full document

... adopted contra-rotating rotors which can be expected to achieve high performance and low-solidity rotors with wide flow passage in order to accomplish high performance and stable opera- ...is ... See full document

... and development period for the contra-rotating small-sized cooling fan is short and its internal flow condition is not clarified ...the performance of each front and rear rotor and internal ... See full document

... the turbine goes deeper, but the general trends are ...the turbine might be limited to some rated value and this would tend to reduce the drag coefficient and hence F D , but ... See full document

... To obtain a closed solution to the momentum equation for the upstream rotor, a further assumption is required. It is clear that the equation above for dF is no longer correct: the upstream rotor will only experience a ... See full document

... which turbine was located and a stationary outer ...The turbine was located at a distance of ...our current study is shown in Figure ...model turbine demonstrated Reynolds number (based on ... See full document

... Transfer of strain gauge data from the two contra-rotating rotors posed some problems. Initially each rotor hub contained a compact data storage device in the form of a WAV format recorder; however timing ... See full document

... the turbine was immediately deployed on arrival off Bunnahabhainn at the Sound of Islay on the 5 th of October ...The turbine was sited in around 12m of water at site A (see ...the turbine observed ... See full document

... generation, contra-rotating marine current turbine has been developed by the Energy Systems Research Unit at the University of ...concept turbine trials, the development ... See full document

... The relatively slow prime mover rotational speed of a tidal turbine necessitates a gearbox to increase the speed suitably for a common four-pole generator. Another option is a direct drive generator with a ... See full document

... the tidal turbines’ performance, recently an attempt to apply the tubercles on a tidal turbine blade was conducted and performance comparisons of tidal turbine models with ... See full document

... axis turbine to the carriage and towing it along the tank, with and without ...model turbine design are given in Section II C. Figure 1 shows the turbine installed on the ...the turbine ... See full document

... and Tidal Turbine (HOTT) Generation System" is ...and Tidal Turbine" hybrid and autonomous power system research will demonstrate the feasibility of using hybrid wind and tidal ... See full document

... Large-scale tidal power plants that close off a portion of the shore and act as sea-based dams have proven to be effective in converting this energy into usable ... See full document

... Their turbine was gradually loaded by electromagnetic brake and in each constant load level the rotating velocity and torque were measured, where the result represented an average value of a 30-second ... See full document

... The inlet boundary is specified as velocity inlet at 0.6m/s at all cases, while the TSR is obtained by changing the rotational speed of the rotor. The outlet is specified as pressure outlet with a pressure of 1 atm. the ... See full document

... of tidal turbines with different leading-edge profiles was manufactured and tested to evaluate the hydrodynamic ...the turbine blades were working under stall ...the turbine, being comparable to the ... See full document