Small wind turbine effectiveness in the urban environment

Battisti, Lorenzo; Benini, E.; Brighenti, A.; Dell’Anna, S.; Castelli, Marco

doi:10.1016/j.renene.2018.05.062

Cited by 72 publications

(43 citation statements)

References 12 publications

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“…Furthermore, previous studies had been conducted about the dynamical behavior of this wind turbine, especially as regards vibrations and control (Scappaticci [29], Castellani [30], Castellani [31], Castellani [32]). Sideways, the study of the control and of the performance of small HAWT technology has recently been attracting attention in the scientific literature, especially as regards the interaction with complex ambient conditions (as, for example, urban environment: see Battisti [33], Balduzzi [34], Bianchi [35], Balduzzi [36]). The numerical methods employed in this work for the simulations are the Fatigue, Aerodynamic, Structures and Turbulence (FAST) software v8, developed at the NREL in Golden, Colorado, and a Blade Element Momentum (BEM) theory code developed for the scientific purposes of this study.…”

Section: Introductionmentioning

confidence: 99%

The Yawing Behavior of Horizontal-Axis Wind Turbines: A Numerical and Experimental Analysis

et al. 2019

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The yawing of horizontal-axis wind turbines (HAWT) is a major topic in the comprehension of the dynamical behavior of these kinds of devices. It is important for the study of mechanical loads to which wind turbines are subjected and it is important for the optimization of wind farms because the yaw active control can steer the wakes between nearby wind turbines. On these grounds, this work is devoted to the numerical and experimental analysis of the yawing behavior of a HAWT. The experimental tests have been performed at the wind tunnel of the University of Perugia on a three-bladed small HAWT prototype, having two meters of rotor diameter. Two numerical set ups have been selected: a proprietary code based on the Blade Element Momentum theory (BEM) and the aeroelastic simulation software FAST, developed at the National Renewable Energy Laboratory (NREL) in Golden, CO, USA. The behavior of the test wind turbine up to ±45 • of yaw offset is studied. The performances (power coefficient C P ) and the mechanical behavior (thrust coefficient C T ) are studied and the predictions of the numerical models are compared against the wind tunnel measurements. The results for C T inspire a subsequent study: its behavior as a function of the azimuth angle is studied and the periodic component equal to the blade passing frequency 3P is observed. The fluctuation intensity decreases with the yaw angle because the distance between tower and blade increases. Consequently, the tower interference is studied through the comparison of measurements and simulations as regards the fore-aft vibration spectrum and the force on top of the tower.

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Section: Introductionmentioning

confidence: 99%

The Yawing Behavior of Horizontal-Axis Wind Turbines: A Numerical and Experimental Analysis

et al. 2019

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“…Barriers for large turbines are such as the availability of large scale on-shore wind farm sites, the negative impact of grid power quality, low public acceptability and losses in transmission and distribution of electricity to the consumers [10]. In addition, it was shown that large wind farms may cause significant climate change especially in terms of temperature increased [11] and escalate rate of precipitation [12,13]. And as such large scale wind turbines are as such not sustainable for long term energy production [9].…”

Section: Fig 3 the Solar-diesel-wind Hybrid Power Plant[5]mentioning

confidence: 99%

“…What important is the design of the wind turbine for Malaysia"s applications must provide the best in three aspects: the highest aerodynamic efficiency, the most effective wind turbine structure and the good self-starting capability. Several review papers have been published [9,10,[12][13] but in this review paper, focus is given to the first aspect i.e. improving the aerodynamic performance of small scaled wind turbines that are suitable for the country of Malaysia.…”

Section: Fig 3 the Solar-diesel-wind Hybrid Power Plant[5]mentioning

confidence: 99%

Aerodynamic Performances of Small Scale Horizontal Axis Wind Turbine Blades for Applications in Malaysia

Roslan,

Rasid,

Toh

et al. 2019

IJRTE

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Wind energy is one of the most viable options for clean and sustainable energy production. In Malaysia where wind source has been considered scarce, the capacity of installed wind energy production is very low. However, studies have shown that it is worthwhile to produce wind energy at several potential sites in this country. For this purpose, it is crucial that the designed turbine blade gives the highest possible blade power efficiency while structure wise, the turbine blade need to be effective in terms of avoiding possible failures. The maximum power efficiency means the blade does not only provide profile that gives maximum sliding ratio but also it must operate at the corresponding angle of attack, 𝜶𝒎𝒂𝒙 that gives this ratio. At the same time, the blade must be small enough to have low weight to allow it to self-start in the low wind region. In this paper, the study is focused on the aerodynamic aspect of the design of wind turbine blade that will give the maximum power efficiency. Four factors that determine aerodynamic performance of the turbine blades are discussed: the wind condition, the airfoil profile, the blade geometry and the losses. In most of the factor, adjustments are made such that the blade operates at around the 𝜶𝒎𝒂𝒙 so that the sliding ratio and thus power coefficient are maximum.

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“…They compared numerical results with experimental results and noticed that the wind turbine could be optimized to produce more energy. The importance of designing small HAWT from the aerodynamic point of view returns to the increased interest of employing these turbines for the urban setting [24]. Unlike large HAWTs that are designed to generate power in areas with optimal wind conditions, small HAWTs are designed to produce power regardless of optimum wind conditions [25].…”

Section: Introductionmentioning

confidence: 99%

Small Wind Turbine Blade Design and Optimization

2019

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This work aims at designing and optimizing the performance of a small Horizontal-Axis-Wind-Turbine to obtain a power coefficient (C P ) higher than 40% at a low wind speed of 5 m/s. Two symmetric in shape airfoils were used to get the final optimized airfoil. The main objective is to optimize the blade parameters that influence the design of the blade since the small turbines are prone to show low performance due to the low Reynolds number as a result of the small size of the rotor and the low wind speed. Therefore, the optimization process will select different airfoils and extract their performance at the design conditions to find the best sections which form the optimal design of the blade. The sections of the blade in the final version mainly consist of two different sections belong to S1210 and S1223 airfoils. The optimization process goes further by investigating the performance of the final design, and it employs the blade element momentum theory to enhance the design. Finally, the rotor-design was obtained, which consists of three blades with a diameter of 4 m, a hub of 20 cm radius, a tip-speed ratio of 6.5 and can obtain about 650 W with a Power coefficient of 0.445 at a wind-speed of 5.5 m/s, reaching a power of 1.18 kW and a power coefficient of 0.40 at a wind-speed of 7 m/s.

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Small wind turbine effectiveness in the urban environment

Cited by 72 publications

References 12 publications

The Yawing Behavior of Horizontal-Axis Wind Turbines: A Numerical and Experimental Analysis

The Yawing Behavior of Horizontal-Axis Wind Turbines: A Numerical and Experimental Analysis

Aerodynamic Performances of Small Scale Horizontal Axis Wind Turbine Blades for Applications in Malaysia

Small Wind Turbine Blade Design and Optimization

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