Results 81 to 90 of about 75,283 (262)

Design of a Horizontal Axis Tidal Turbine for Less Energetic Current Velocity Profiles

Journal of Marine Science and Engineering, 2019
Existing installations of tidal-stream turbines are undertaken in energetic sites with flow speeds greater than 2 m/s. Sites with lower velocities will produce far less power and may not be as economically viable when using “conventional” ...
Job Immanuel Encarnacion, Cameron Johnstone, Stephanie Ordonez-Sanchez   +2 more
doaj   +1 more source

Rotor aerodynamic power limits at low tip speed ratio using CFD

Journal of Physics: Conference Series, 2014
When investigating limits of rotor aerodynamic models, the Betz limit serves as a solid marker of an upper limit which no model should be able to exceed. A century ago Joukowsky (1912) proposed a rotor aerodynamic model utilizing a rotating actuator disc with a constant circulation.
Mikkelsen, Robert Flemming; id_orcid 0000-0002-4095-1228, Sarmast, Sasan, Henningson, Dan, Sørensen, Jens Nørkær; id_orcid 0000-0002-1974-2675   +3 more
openaire   +2 more sources

Tailoring Functional Properties of Ti–Ni–Cu Shape Memory Alloy Thin Films for MEMS Actuators

Advanced Engineering Materials, EarlyView.
A comprehensive study of critical parameters required to develop well‐performing Ti–Ni–Cu thin film shape memory alloy microactuators is provided. Materials science and device integration aspects are integrated by addressing structural and physical relationships using complementary characterization techniques as well as a practical fabrication solution
Elaheh Akbarnejad, Aleksander Kostka, Gowtham Arivanandhan, Yujiao Li, Alan Savan, Manfred Kohl, Alfred Ludwig   +6 more
wiley   +1 more source

Application of Richardson extrapolation method to the CFD simulation of vertical-axis wind turbines and analysis of the flow field

Engineering Applications of Computational Fluid Mechanics, 2019
There is still discrepancy regarding the verification of CFD U-RANS simulations of vertical-axis wind turbines (VAWTs). In this work, the applicability of the Richardson extrapolation method to assess mesh convergence is studied for several points in the
Andrés Meana-Fernández, Jesús Manuel Fernández Oro, Katia María Argüelles Díaz, Mónica Galdo-Vega, Sandra Velarde-Suárez   +4 more
doaj   +1 more source

Direct Metal Deposition of Graphene–Ti28Nb35.4Zr Matrix Composites With Enhanced Mechanical, Corrosion, and Biocompatibility Properties for Bone Implants

Advanced Engineering Materials, EarlyView.
Graphene nanoplatelet (0.1 wt.%) reinforcement significantly enhances the performance of β Ti‐28Nb‐35.4Zr alloy. Grain refinement, reduced water contact angle, and improved surface characteristics promote osteoblast adhesion and complete surface coverage after 7 days.
Khurram Munir, Jixing Lin, Yuncang Li, Li Zhu, Paul F. A. Wright, Cuie Wen   +5 more
wiley   +1 more source

In Situ Micromechanical Study of Bimodal γ′–γ″ Precipitate Assemblies in Ni–Cr–Al–Nb Superalloy

Advanced Engineering Materials, EarlyView.
A Ni–Cr–Al–Nb superalloy with a bimodal γ′–γ″ precipitate distribution is developed. Composite precipitate assemblies form through heterogeneous nucleation, effectively impeding dislocation motion. Micropillar compression reveals high strength at room and elevated temperatures, governed by precipitate shearing, with coupled faulting mechanisms ...
Ujjval Bansal, Tae‐Hyeok Kang, Pyuck‐Pa Choi, Subin Lee, Christoph Kirchlechner   +4 more
wiley   +1 more source

Unlocking the power of the wind: Innovations in smart hybrid vertical axis wind turbines

International Journal of Renewable Energy Development
As global concerns about CO2 emissions grow, the development of green energy sources like wind power has become increasingly important. Two significant strengths of vertical-axis wind turbines relative to horizontal-axis models are their capacity to ...
Elysa Nensy Irawan, Kai Shibuya, Ken-Ichiro Yamashita, Goro Fujita   +3 more
doaj   +1 more source

An Innovative Approach To Making Ultra Light Weight Wind Turbine Blades [PDF]

Mehran University Research Journal of Engineering and Technology, 2012
An innovative mould free method for the fabrication of ultimate light weight small wind turbine blades made out of composites has been suggested in this paper. The method has been practically applied with very satisfactory results.
Suhail Zaki Farooqui
doaj  

Influence of Surface Finish on the Tribological Performance of AlTiBN Coatings Deposited on Forming Tools

Advanced Engineering Materials, EarlyView.
Aluminum and nitride coatings are used in industry because they are hard, resist wear, and protect against oxidation. Adding boron can improve friction behavior and other properties. This study tests coatings on surfaces with different finishes. Results show smoother surfaces perform better, while rough ones wear faster, although coatings can reduce ...
Adrián Claver, Iker Alfonso, Eneko Barba, Javier León, José Antonio García, Iñaki Zalakain, Iván Fernández Martínez, Arley García‐Carrero, Christian Almeyda, Daniel Salcedo   +9 more
wiley   +1 more source

Influence of the tip speed ratio on the wake dynamics and recovery of axial-flow turbines

Physics of Fluids
Detached eddy simulation is employed to investigate the wake development downstream of the rotor of an axial-flow turbine and its dependence on the tip speed ratio. In this study, we found that the trend of the momentum deficit as a function of the rotational speed shows opposite directions in the near wake and further downstream.
Antonio Posa, Ignazio Maria Viola, Riccardo Broglia   +2 more
openaire   +1 more source