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...

This paper analyses the effects of doubly fed induction generator (DFIG) tidal current turbines on a distribution grid under unbalanced voltage conditions of the grid. A dynamic model of an electrical power system under the unbalanced network is described in the paper, aiming to compare the system performance when connected with and without DFIG at the same location in a distribution grid. Exte...

Turbine-driven mechanical ventilators have some important advantages over conventional ventilators. The most obvious of these is independence of compressed air supply during patient transport, but higher NIV performance due to higher peak flow is also often mentioned. However, there is still a widespread belief that conventional ventilators using compressed air supplies outperform turbine-drive...

An experimental study of the performance and optimisation of a prototype novel drag-driven vertical axis tidal stream turbine is presented. The drag turbine has several unique advantages, including simple blade design, deployable in shallow waters and potential denser array spacing. Performance optimisation was conducted in the hydraulics flume at Cardiff University (CU), where the turbine reac...

Marine hydrokinetic power projects will operate as marine environments change in response to increased atmospheric carbon dioxide concentrations. We considered how tidal power development and stressors resulting from climate change may affect Puget Sound species listed under the U.S. Endangered Species Act (ESA) and their food web. We used risk tables to assess the singular and combined effects...

Solar energy, renewable energy, urban wind energy, environment, augmented wind turbine. a r t i c l e i n f o

This study aimed to present the experimental results of two types turbines and attachments used in a hydro-compact generator. Two Horizontal Spiral Turbines (HSTs) with blade angles eighteen twenty-one degrees, respectively, three-blade turbine were tested experimented laboratory at five levels water flow rate ranging from 1–2 m/s. After efficiency torque values each identified, they installed ...

Recent developments from the cast 718Plus® Metals Affordability Initiative (MAI) program will be presented and discussed. The objective of the program is to investigate and enable the use of 718Plus® (hereinafter referred to as 718Plus) in the form of investment castings by (1) increasing the allowable operating temperature by about 75°F as compared with conventional cast Alloy 718 and (2) achi...