0000000000282793
AUTHOR
Luana Gurnari
A New Cross-Flow Type Turbine for Ultra-Low Head in Streams and Channels
In the last few decades, hydropower production has been moving toward a new paradigm of low and diffused power density production of energy with small and mini-hydro plants, which usually do not require significant water storage. In the case of nominal power lower than 20 kW and ultra-low head H (H < 5 m), Archimedes screw or Kaplan type turbines are usually chosen due to their efficiency, which is higher than 0.85. A new cross-flow type turbine called Ultra-low Power Recovery System (UL-PRS) is proposed and its geometry and design criteria are validated in a wide range of operating conditions through 2D numerical analysis computed using the ANSYS Fluent solver. The new proposed solution…
An Evaluation Matrix to Compare Computer Hydrological Models for Flood Predictions
In order to predict and control the impacts of floods in torrents, it is important to verify the simulation accuracy of the most used hydrological models. The performance verification is particularly needed for applications in watersheds with peculiar climatic and geomorphological characteristics, such as the Mediterranean torrents. Moreover, in addition to the accuracy, other factors affect the choice of software by stakeholders (users, modellers, researchers, etc.). This study introduces a &ldquo
ON THE WAVE-U-OWC INTERACTION IN A NUMERICAL 2D WAVE FLUME
Several wave energy conversion techniques have been patented all over the world. Despite this large variation in design, the Wave Energy Converters (WECs) are generally categorized by location, type and modes of operation. An Oscillating Water Column consists of a chamber with an opening to the sea below the water line. An OWC consists of a box with a big vertical opening in the front wall. Waves enter through this opening with only some small diffraction effects from the front wall (and they propagate on the water surface in the box. On the roof of the box there is a tube connecting the atmosphere with the air pocket enclosed between the water surface and the roof. This tube contains one o…