Are small-scale wind turbines green? In this study, we perform a ‘cradle to grave’ life cycle assessment of novel domestic-scale 10 kW vertical axis turbine tree which uses combined Savonius and H-Darrieus blades. Situated at test site in Surat Thani, Thailand, SimaPro software was used evaluate the environmental impact profile tree. Comparisons Thai grid mix were made, using both with without ...

Abstract Theoretical considerations on the competition between most amplified modes for Darrieus–Landau (DL) hydrodynamic instability and turbulence timescales, show that, two extremal regimes can be identified: instability-dominated turbulence-dominated regimes. In latter, also denoted as unified regime, both experiments numerical simulations give evidence showing how large scale, cusp-like st...

We present a numerical model which allows us to investigate thermonuclear flames in Type Ia supernova explosions. The model is based on a finite-volume explicit hydrodynamics solver employing PPM. Using the level-set technique combined with in-cell reconstruction and flux-splitting schemes we are able to describe the flame in the discontinuity approximation. We apply our implementation to flame...

This paper presents a numerical analysis of the performance of a five-bladed Darrieus vertical-axis water turbine, based on the NACA 0025 blade profile, for both bare and shrouded configurations. A complete campaign of 2-D simulations, performed for several values of tip speed ratio and based on RANS unsteady calculations, has been performed to obtain the rotor torque and power curves. Also the...

The complex and unsteady aerodynamics of vertical axis wind turbines (VAWTs) pose significant challenges for simulation tools. Recently, significant research efforts have focused on the development of new methods for analysing and optimising the aerodynamic performance of VAWTs. This paper presents an electric circuit model for Darrieus-type vertical axis wind turbine (DT-VAWT) rotors. The nove...