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 a factor of about 2–5 compared with a bare wind turbine, for a given turbine diameter and wind speed. This is because a low-pressure region, due to a stro...

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 use of a shroud around the rotor of a wind turbine has been known to augment the airflow through the rotor plane and hence result in improved performance. This work uses Computational Fluid Dynamics (CFD) to assess the validity of several simple theories which attempt to extend Betz theory to shrouded turbines. Two CFD models are employed and compared to predictions of previously published ...

The flow behavior inside the shrouded disk system is of importance in appropriate design of turbomachinery cavities and turbine test cell hydraulics dynamometer. The turbulent incompressible flow is analyzed for the shrouded disk system with axial clearance. The flow core behaves as a Batchelor type structure when a weak inflow is imposed on the disk cavity. By increasing the inflow, the centra...

Diffuser technology placed around hydrokinetic rotors may improve the conversion of fluid’s kinetic energy into shaft power. However, rotor blades are susceptible to phenomenon cavitation, which can impact overall power efficiency. This paper presents development a new optimization model applied shrouded by diffuser. The proposed geometry takes account effect cavitation inception. main contribu...

Wind turbines represent a growing energy source worldwide. In many cases, operating in turbulent and changing wind direction spots. this work, we use tunnel to analyze the effect of turbulence turbine provided with Lens flow concentrator, under yaw conditions, for intensity values 10% 15%. Measurements are made power coefficient as function Tip Speed Ratio using two types Lens, CiiB5 CiiB10, at...