An experimental campaign of measurements for a Darrieus vertical-axis wind turbine (VAWT) is presented for open field conditions. The turbine is characterized by a twisted bladed design, each blade being placed at a fixed distance from the rotational shaft. The experimental setup to perform the acquisitions is described. The results are lower than expected, due to the high influence of the wind...

Location and geometry optimisations of Straight Plate Upstream Deflector (SPUD) for performance enhancement a three-straightbladed Vertical Axis Wind Turbine (VAWT) are carried out at three regimes tip speed ratios (TSRs). Results analysis reveals that SPUD location has significant effect on the power coefficient ( C p ) increment VAWT. Placing two SPUDs both upward downward in upstream VAWT ca...

Renewable energy has received a lot of attention. In recent years, offshore wind power particular attention among renewable energies. Fixed-type turbines are now the most popular. However, because deep seas surrounding Japan, floating types more preferable. The system is one factors that raises cost turbines. Vertical axis (VAWT) have low center gravity and can tilt their rotors. As result, sma...

The wind is one of the most promising green energy resources that replenishes itselves in less than a human lifetime without depleting planet’s resources. According to disposition blade concerning shaft, turbine can be classified as horizontal axis (HAWT) and vertical (VAWT). In contrast VAWT, HAWT covers commercial installations around globe. However, VAWTs became alternative for areas far awa...

Numerous studies have been conducted to investigate effect of blade geometry vertical axis wind turbine performance. Most the evaluations focused on airfoil series and parameters such as thickness camber airfoil. Few examined other In present study, geometric change in leading-edge radius (LER) a performance has numerically studied. Hence, modified NACA 0021 profiles were created using method (...

Abstract The upscaling of wind turbines results in fewer units per installed MW reducing infrastructure and maintenance costs offshore farms. Multi rotor systems (MRS), comprising many turbine rotors on a single support structure, are potentially means to maximize the benefit achieving larger unit capacities than is feasible or economic with conventional, 3-bladed horizontal axis (HAWT). MRS ha...

Vertical Axis Wind Turbines (VAWTs) are omnidirectional turbomachines commonly used in rural areas for small-to-medium-scale power generation. The complex flow observed the wake region of VAWTs is affected by a number factors, such as rotor blades design. A damaged significantly alters field VAWT, degrading its generation capability. Published literature on wind turbine severely limited to torq...

In combinatorics on words, a word $w$ over an alphabet $\Sigma$ is said to avoid pattern $p$ $\Delta$ if there no factor $f$ of such that $f=h(p)$ where $h:\Delta^*\to\Sigma^*$ non-erasing morphism. A be $k$-avoidable exists infinite $k$-letter avoids $p$. \emph{doubled} every variable occurs at least twice. Doubled patterns are known $3$-avoidable. Currie, Mol, and Rampersad have considered ge...

Wind energy is one of the most important renewable energies since it reduces environmental pollution. Darrieus VAWTs with straight-bladed are more prevalent in small-scale power generation due to their simple blade design and easy construction. The investigation performance a topic that fascinating for Researchers look into. have paid special attention Double Multiple Stream Tube (DMST) model V...

Vertical axis wind turbine (VAWT) blades undergo dynamic separation due to the large angle of attack variation they experience during a turbine rotation. The flow over a single blade was modeled using a sinusoidally pitching and surging airfoil in a constant free stream flow at a mean chord Reynolds number of 10. Two-dimensional, time resolved velocity fields were acquired using particle image ...