The development of the Vertical Axis Wind Turbine (VAWT) is still a challenge for several researchers in world and Indonesia. Due to potential Indonesian coast generally has an average wind speed 3-7 m / s which classified as low very suitable VAWT operates at speeds. Combining 2 existing types one efforts on improve performance these turbines. Hybrid Savonius-Darrieus can increase coefficient ...

Recent developments in tidal energy converter technology and turbine array projects require fast and robust simulation tools. An important challenge is now estimating the power production for a array of machines as well as optimizing the placement within a grid. The most common method to do so is the coupling of momentum sources with a flow simulation. This method, called the actuator disc mode...

Turbulent-flame speeds in methane–air mixtures were measured in a Taylor–Couette apparatus with counter-rotating cylinders, used to generate turbulence that is nearly homogeneous and isotropic over many integral length and time scales. While laminar-flame propagation is found to be influenced by the Darrieus– Landau instability and heat loss to the walls of the apparatus, turbulent-flame propag...

A nonlinear equation describing curved stationary flames with arbitrary gas expansion θ = ρfuel/ρburnt, subject to the Landau-Darrieus instability, is obtained in a closed form without an assumption of weak nonlinearity. It is proved that in the scope of the asymptotic expansion for θ → 1, the new equation gives the true solution to the problem of stationary flame propagation with the accuracy ...