Topic
Ram air turbine
About: Ram air turbine is a research topic. Over the lifetime, 2268 publications have been published within this topic receiving 24506 citations. The topic is also known as: RAT.
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TL;DR: In this article, a simple control scheme is proposed that allows an induction motor to run a wind turbine at its maximum power coefficient, using a standard V/Hz converter and controlling the frequency to achieve the desired power at a given turbine speed.
Abstract: To optimize the power in a wind turbine, the speed of the turbine should be able to vary with the wind speed. A simple control scheme is proposed that will allow an induction motor to run a turbine at its maximum power coefficient. The control uses a standard V/Hz converter and controls the frequency to achieve the desired power at a given turbine speed.
317 citations
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TL;DR: In this article, the performance of a single plane biplane Wells turbine with or without guide vanes is compared with a wave energy device based on the principle of the oscillating water-air column.
286 citations
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TL;DR: In this paper, the authors present an overview of current and future sustainable gas turbine technologies and compare them with other existing and future gas turbine-based power generation technologies, focusing on the various advance cycles involving heat recovery from the gas turbine exhaust.
Abstract: In this work an overview of current and future sustainable gas turbine technologies is presented. In particular, the various gas turbine technologies are described and compared. Emphasis has been given to the various advance cycles involving heat recovery from the gas turbine exhaust, such as, the gas to gas recuperation cycle, the combined cycle, the chemical recuperation cycle, the Cheng cycle, the humid air turbine cycle, etc. The thermodynamic characteristics of the various cycles are considered in order to establish their relative importance to future power generation markets. The combined cycle technology is now well established and offers superior to any of the competing gas turbine based systems, which are likely to be available in the medium term for large-scale power generation applications. In small-scale generation, less than 50 MWe, it is more cost effective to install a less complex power plant, due to the adverse effect of the economics of scale. Combined cycle plants in this power output range normally have higher specific investment costs and lower electrical efficiencies but also offer robust and reliable performance. Mixed air steam turbines (MAST) technologies are among the possible ways to improve the performance of gas turbine based power plants at feasible costs (e.g. peak load gas turbine plants).
273 citations
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TL;DR: In this paper, a theoretical model is developed to simulate the energy conversion from wave to turbine shaft of an oscillating-water-column (OWC) plant equipped with a Wells air-turbine and with a valve (in series or in parallel with the turbine) for air-flow control.
258 citations
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01 Jan 1996TL;DR: In this article, Ferrite permanent magnets with flux concentrating pole pieces are used as direct coupled generators in wind turbines and can be built to fit within the confined space of a nacelle.
Abstract: Multipole radial field machines with permanent magnet excitation can be used as direct coupled generators in wind turbines and can be built to fit within the confined space of a nacelle. High efficiency and power factor are maintained over a wide range of operating power. Ferrite permanent magnets with flux concentrating pole pieces are preferred to rare earth types because of their lower cost. The primary brake for the wind turbine can be electrical since the permanent magnet excitation is available in the absence of an external supply.
243 citations