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Numerical study of detailed flow field and performance of Savonius wind turbines

Zhou, Tong; Rempfer, Dietmar - In: Renewable Energy 51 (2013) C, pp. 373-381

The Savonius vertical axis wind turbine is simple in structure, has good starting characteristics, relatively low operating speeds, and an ability to accept wind from any direction, although it has a lower efficiency than some other vertical axis wind turbines. So far a number of experimental...

Persistent link: https://www.econbiz.de/10010805445

Multivariable wind modeling in state space

Teimouri-Sichani, M.; Pedersen, B.J. - In: Renewable Energy 36 (2011) 7, pp. 1964-1972

Turbulence of the incoming wind field is of paramount importance to the dynamic response of wind turbines. Hence … reliable stochastic models of the turbulence should be available from which time series can be generated for dynamic response … and structural safety analysis. In the paper an empirical cross-spectral density function for the along-wind turbulence …

Persistent link: https://www.econbiz.de/10010805503

Study of the influence of imposed turbulence on the asymptotic wake deficit in a very long line of wind turbines

Breton, S.-P.; Nilsson, K.; Olivares-Espinosa, H.; … - In: Renewable Energy 70 (2014) C, pp. 153-163

The influence of imposed turbulence on the development of the flow along a long row of wind turbines is studied, in … for modeling turbulence, and the wind turbine rotors are represented as actuator discs whose loading is determined through …

Persistent link: https://www.econbiz.de/10010805911

The effect of turbulence on noise emissions from a micro-scale horizontal axis wind turbine

Rogers, T.; Omer, S. - In: Renewable Energy 41 (2012) C, pp. 180-184

number of issues such as low wind speeds, high turbulence and noise issues. This paper presents the results of an … investigation carried out to assess the effect of turbulence on the noise emissions from a micro-scale horizontal axis wind turbine …-third octave sound levels to quantify the sound spectrum for the MWT. The second experiment assessed the effects of turbulence on …

Persistent link: https://www.econbiz.de/10010805951

Energy efficiency in process industry – High-efficiency vortex (HEV) multifunctional heat exchanger

Ghanem, Akram; Habchi, Charbel; Lemenand, Thierry; … - In: Renewable Energy 56 (2013) C, pp. 96-104

In the process industry, vortex generators are being increasingly incorporated in modern multifunctional heat exchangers/reactors to enhance heat and mass transfer and thus increase energy efficiency. Longitudinal and transverse pressure-driven vortices and shear-instability-driven flow...

Persistent link: https://www.econbiz.de/10010806119

Gain scheduling control of variable speed WTG under widely varying turbulence loading

Billy Muhando, Endusa; Senjyu, Tomonobu; Urasaki, Naomitsu - In: Renewable Energy 32 (2007) 14, pp. 2407-2423

Probabilistic paradigms for wind turbine controller design have been gaining attention. Motivation derives from the need to replace outdated empirical-based designs with more physically relevant models. This paper proposes an adaptive controller in the form of a linear quadratic Gaussian (LQG)...

Persistent link: https://www.econbiz.de/10010806361

Experimental study of the turbulence intensity effects on marine current turbines behaviour. Part I: One single turbine

Mycek, Paul; Gaurier, Benoît; Germain, Grégory; … - In: Renewable Energy 66 (2014) C, pp. 729-746

The ambient turbulence intensity in the upstream flow plays a decisive role in the behaviour of horizontal axis marine …

Persistent link: https://www.econbiz.de/10010806376

The turbulence effect of the airflow on the calorific losses in foodstuff dryers

Youcef-Ali, S.; Desmons, J.Y.; Daguenet, M. - In: Renewable Energy 29 (2004) 5, pp. 661-674

The calorific losses through the sidewalls delay drying, particularly in the higher racks of the foodstuff dryers, which provide us information on total drying time. One notes a temperature gradient of the air during its circulation upwards, between the entry and the exit of the empty dryer....

Persistent link: https://www.econbiz.de/10010806975

Experimental study of the turbulence intensity effects on marine current turbines behaviour. Part II: Two interacting turbines

Mycek, Paul; Gaurier, Benoît; Germain, Grégory; … - In: Renewable Energy 68 (2014) C, pp. 876-892

The future implantation of second generation marine current turbine arrays depends on the understanding of the negative interaction effects that exist between turbines in close proximity. This is especially the case when the turbines are axially aligned one behind another in the flow.

Persistent link: https://www.econbiz.de/10010806981

Augmented LQG controller for enhancement of online dynamic performance for WTG system

Muhando, Endusa Billy; Senjyu, Tomonobu; Kinjo, Hiroshi; … - In: Renewable Energy 33 (2008) 8, pp. 1942-1952

Operation of variable speed wind turbine generator (WTG) in the above-rated region characterized by high turbulence …

Persistent link: https://www.econbiz.de/10010804770