Results 91 to 100 of about 372,323 (311)

Experimental study of two low tip-speed ratio micro-scale wind turbines operating in tandem

Journal of Renewable and Sustainable Energy
This paper presents a parametric experimental study of a dual-rotor wind turbine system operating at low tip-speed ratios of the order of 1. The flow-field in the wake of such a multibladed-high solidity micro-scale wind turbine is measured and characterized at distances up to 15Rt, with Rt=70 mm being the tip radius of the turbine.
Shuo Zhang, Michaël Pereira, Florent Ravelet, Alfred Boyer   +3 more
openaire   +2 more sources

The effect of circumferential distortion on fan performance at two levels of blade loading [PDF]

Single stage fans designed for two levels of pressure ratio or blade loading were subjected to screen-induced circumferential distortions of 90-degree extent.
Hartmann, M. J., Sanger, N. L.
core   +1 more source

Positive‐Tone Nanolithography of Antimony Trisulfide with Femtosecond Laser Wet‐Etching

Advanced Functional Materials, EarlyView.
A butyldithiocarbamic acid (BDCA) etchant is used to fabricate various micro‐ and nanoscale structures on amorphous antimony trisulfide (a‐Sb2S3) thin film via femtosecond laser etching. Numerical analysis and experimental results elucidate the patterning mechanism on gold (reflective) and quartz (transmissive) substrates.
Abhrodeep Dey, Uwe Hübner, Albane Benardais, Xiaofei Wu, Andrea Dellith, Jan Dellith, Torsten Wieduwilt, Henrik Schneidewind, Markus A Schmidt, Virginie Nazabal, Volker Deckert, Jer‐Shing Huang, Wei Wang   +12 more
wiley   +1 more source

Study the effect of using a dual rotor system on the performance of horizontal axis wind turbines using CFD

Global Energy Interconnection
This research aims to improve the power output of a horizontal axis wind turbine (HAWT) by using an auxiliary rotor in front of the main rotor, this configuration is called a dual-rotor wind turbine (DRWT). The three-bladed main rotor has a diameter of 0.
Amr Mokhtar, Mahmoud Fouad, Mohamed Rashed, Mostafa Mokhtar   +3 more
doaj   +1 more source

Brief communication: Real-time estimation of the optimal tip-speed ratio for controlling wind turbines with degraded blades [PDF]

Wind Energy Science
Rotor performance is adversely affected by the wear and tear of blade surfaces caused, for example, by rain, snow, icing, dirt, bugs and aging. Blade surface degradation changes the aerodynamic properties of the rotor, which in turn changes the optimal ...
D. Kumar, D. Kumar, D. Kumar, M. A. Rotea, M. A. Rotea   +4 more
doaj   +1 more source

On‐Surface Indigo‐Based Bimolecular Coordination Networks with Programmable Regular or Vitreous Structure

Advanced Functional Materials, EarlyView.
A previously unreported coordination motif stabilising single Fe atoms by indigo chelation and pyridyl coordination on Au(111) has been revealed. By using planar tritopic pyridyl linkers (TPyB), extended 2D porous networks of indigo3(TPyB)2Fe6 form. These networks can be crystalline or vitreous and offer an environment where individual coordination ...
Hongxiang Xu, Ritam Chakraborty, Biao Yang, Dennis Meier, Joachim Reichert, Svetlana Klyatskaya, Mario Ruben, Shobhana Narasimhan, Johannes V. Barth, Anthoula C. Papageorgiou   +9 more
wiley   +1 more source

Aerodynamic performance of a 1.35-pressure-ratio axial-flow fan stage [PDF]

The overall blade element performances and the aerodynamic design parameters are presented for a 1.35-pressure-ratio fan stage. The fan stage was designed for a weight flow of 32.7 kilograms per second and a tip speed of 302.8 meters per second.
Moore, R. D., Osborn, W. M., Steinke, R. J.   +2 more
core   +1 more source

A Bespoke Programmable Interpenetrating Elastomer Network Composite Laryngeal Stent for Expedited Paediatric Laryngotracheal Reconstruction

Advanced Functional Materials, EarlyView.
A programmable interpenetrating double‐network architecture, created via 3D‐TIPS printing and resin infusion, synergistically combines thermoplastic and thermosetting elastomers to balance structural rigidity and surface softness—crucial for paediatric laryngeal stents.
Elizabeth F. Maughan, Lei Wu, Dong Zhang, Linxiao Wu, Graca Ferreira Vaz Pinto Mendes, Wanqiao J. Tu, Heping Ma, Toby J. Proctor, Colin R. Butler, Thomas Kjærgaard, Mark W. Lowdell, Martin A. Birchall, Robert E. Hynds, Richard Hewitt, Wenhui Song   +14 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

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