Assessment and optimization of the power performance of twin vertical axis wind turbines via numerical simulations

Towards optimal layout design of vertical-axis wind-turbine farms: Double rotor arrangements

“…Following a series of field measurements, Dabiri [4] and Whittlesey et al [23] concluded that in certain layouts, VAWT farms have the potential to reach an order of magnitude higher power densities compared to HAWT farms. Peng et al [22] and Alexander and Santhanakrishnan [21] predicted a power gain increase of 8-13% in specific operating conditions and arrangements, thought to be due to the discussed synergic interactions. Zanforlin and Nishino [5] and Bremseth and Duraisamy [24] found that this power increase could be due to the contraction of the wake of the turbines and development of regions of excess momentum between the turbines.…”

“…The conclusions presented by the literature, although valuable, are based on a limited number of VAWT arrangements. A wide range of potential power gain for adjacent VAWTs is reported in the literature ranging from 8% [22] up to 100% [24] and there is little consensus on the extent of this potential; 2. Optimal regions for placing subsequent rotors in VAWT arrangements are not well identified; 3.…”

“…Mechanisms leading to power performance enhancement and C P increment of VAWT arrangements are not yet fully understood. [22] CFD (URANS) 2 AF, PA, σ, RD, R 4 (16) C P FM = field measurement, LF = low fidelity, LRB = Leaky-Rankine body, CFD ¼ computational fluid dynamics, URANS ¼ unsteady Reynolds-Averaged Navier-Stokes, WT = wind-tunnel measurement, P/V = panel/vortex method, R = relative distance, Φ = relative angle, RD = rotation direction, WD = wind direction, λ = tip speed ratio, Δθ = phase lag, σ = solidity, AF = airfoil type, PA = pitch angle.…”

Varying VAWT Cluster Configuration and the Effect on Individual Rotor and Overall Cluster Performance

“…Most of the published literature deals with only one or two schemes of comparison when dealing with VAWT clustering, most commonly on the varying turbine distances [3,4,9,23] and/or direction of turbine direction [24][25][26], hence the intention of this study is to integrate the important variations in a turbine cluster and illustrate their effect in a single, continuous study.…”

Wind Deflector Design and Wake Characteristics of New Type Vertical Axis Wind Turbine in Renewable Power Generation

“…During recent years, due to the continuous decline in air quality, environmental troubles have gradually attracted people's attention. The use of traditional fossil energy will inevitably pollute the environment, and sooner or later will face resource constraints [1]- [6]. Wind energy is the kinetic energy that flows in the atmosphere.…”