Results 31 to 40 of about 56,466 (281)

Analysis of model rotor blade pressures during parallel interaction with twin vortices [PDF]

, 2005
This paper presents and provides analysis of unsteady surface pressures measured on a model rotor blade as the blade experienced near parallel blade vortex interaction with a twin vortex system.
Beddoes T. S., Brocklehurst A., Caradonna F. X., Caradonna F. X., Copland C. M., Coton F. N., F. N. Coton, Gowanlock D. K., Hoad D. R., Horner M. B., Jones H. E., Liu Z., Lowson M. V., Masson C. A., Padakannaya R., R. A. McD. Galbraith, R. B. Green, Tangler J. L., Tyler D. J., Wu J. M.   +19 more
core   +1 more source

A rotational speed recovery strategy for wind turbines considering secondary frequency drops

Zhejiang dianli
Wind turbines can contribute to frequency regulation by releasing rotor kinetic energy， which is an effective way to ensure frequency stability in power systems with high wind power penetration.
LYU Zhenhua, LI Yaran, ZHENG Mingzhong, LI Qiang, HU Yingjie   +4 more
doaj   +1 more source

Observations of the Growth and Decay of Stall Cells during Stall and Surge in an Axial Compressor

International Journal of Rotating Machinery, 2017
This research investigated unsteady events such as stall inception, stall-cell development, and surge. Stall is characterized by a decrease in overall pressure rise and nonaxisymmetric throughflow.
Adam R. Hickman, Scott C. Morris
doaj   +1 more source

Numerical Analysis of the Dynamic Interaction between Two Closely Spaced Vertical-Axis Wind Turbines

Energies, 2021
To investigate the optimum layouts of small vertical-axis wind turbines, a two-dimensional analysis of dynamic fluid body interaction is performed via computational fluid dynamics for a rotor pair in various configurations.
Yutaka Hara, Yoshifumi Jodai, Tomoyuki Okinaga, Masaru Furukawa   +3 more
doaj   +1 more source

A Two-Stage Coordinated Frequency Regulation Strategy for Wind Turbines Considering Secondary Frequency Drop and Rotor Speed Recovery

Energies
The capability of wind turbines (WTs) to provide frequency response is crucial for future power systems with high wind power penetration. Existing strategies primarily focus on mitigating initial and secondary frequency drop (SFD), often overlooking the ...
Yufei Han, Yibo Zhou, Kexin Li
doaj   +1 more source

Hydrodynamics and Wake Flow Analysis of a Floating Twin-Rotor Horizontal Axis Tidal Current Turbine in Roll Motion

Journal of Marine Science and Engineering, 2023
The study of hydrodynamic characteristics of floating double-rotor horizontal axis tidal current turbines (FDHATTs) is of great significance for the development of tidal current energy. In this paper, the effect of roll motion on a FDHATT is investigated
Muyu Zhao, Ying Chen, Jin Jiang
doaj   +1 more source

Separation of Metal and Cathode Materials from Waste Lithium Iron Phosphate Battery by Electrostatic Process

Separations, 2023
The improper disposal of retired lithium batteries will cause environmental pollution and a waste of resources. In this study, a waste lithium iron phosphate battery was used as a raw material, and cathode and metal materials in the battery were ...
Huabing Zhu, Yuxuan Bai, Lei Zu, Haijun Bi, Jian Wen   +4 more
doaj   +1 more source

Windage measurements in a rotor stator cavity with rotor mounted protrusions and bolts [PDF]

, 2012
This paper reports an experimental investigation of the windage associated with enclosed rotor-stator systems with superposed throughflow, as commonly found in gas turbine engines.
Coren, Daniel, Long, Christopher, Miles, Anna Louise   +2 more
core   +1 more source

Electroactive Metal–Organic Frameworks for Electrocatalysis

Advanced Functional Materials, EarlyView.
Electrocatalysis is crucial in sustainable energy conversion as it enables efficient chemical transformations. The review discusses how metal–organic frameworks can revolutionize this field by offering tailorable structures and active site tunability, enabling efficient and selective electrocatalytic processes.
Irena Senkovska, Yutong Luo, Ruyan Zhao, Jianjun Zhang, Mingchao Wang, Xinliang Feng, Eike Brunner, Stefan Kaskel   +7 more
wiley   +1 more source

Physical rotor speed recovery strategy for grid-forming permanent magnet synchronous generator-based wind turbines under turbulent wind conditions

电力工程技术
After the frequency support of grid-forming permanent magnet synchronous generator-based wind turbines (GFWTs) is completed, it is necessary to promptly restore the physical rotor speed to enable the GFWTs to re-operate at the maximum power point ...
Xiaoming ZOU, Chenggen WANG, Yingjie HU
doaj   +1 more source