Small Darrieus hydrokinetic turbines with fixed pitch blades typically suffer from poor starting torque, low efficiency … helical blades, or reduced by using multiple blades. Starting torque can be marginally improved by the use of cambered blade …

hydrokinetic energy conversion devices—a cylindrical Gorlov Helical Turbine (GHT) and a Lucid Spherical Turbine (LST). The turbines …Power and drag (or thrust) measurements were performed in a towing tank for two different helical cross-flow marine …-corrected data. The results presented here will help increase the amount of experimental data for helical devices in the literature …

source region, a strategy that is first validated against Betz theory. The diffuser configuration produces 3.1 times more … power than the turbine with no diffuser. A scaling analysis also shows a turbine with a diffuser outperforms a larger size … turbine with no diffuser. …

conical diffuser with high pressure recovery performance is a good choice for the supersonic separator. The shock waves appear … diffuser. When the swirling flow goes into the diffuser, the strength of the swirl changes the shock positions and the static …

We have developed a new wind turbine system that consists of a diffuser shroud with a broad-ring brim at the exit … periphery and a wind turbine inside it. The shrouded wind turbine with a brimmed diffuser has demonstrated power augmentation by … inside the diffuser shroud. …

We studied the improved effects a diffuser had on the output power of small wind turbine systems, aiming to introduce … these systems to radio relay stations as an independent power supply system. A frustum-shaped diffuser was chosen from an … economical standpoint and wind speed distribution. The effect the diffuser's shape had on the wind speed was analyzed by …

To clarify the behavior of the blade tip vortices of a wind turbine equipped with a brimmed-diffuser shroud, called a … unique wind turbine consists of not only rotating blades but also a diffuser shroud with a broad-ring brim at the exit … the blade tip and the inner surface of the diffuser. Since these vortices interacted with each other, the blade tip vortex …

A new class of diffuser augmented wind turbines (DAWTs) is presented. The new diffuser concept exploits aero … potentials which exceed the power efficiency based on the diffuser exit area by 50%. The paper presents the 1D momentum theory …-Axis Wind Turbines (HAWTs). Inviscid axisymmetric panel code calculations are then used to drive the diffuser design towards …