Results 31 to 40 of about 297,175 (241)

Turbulence characteristics of the B\"{o}dewadt layer in a large enclosed rotor-stator system [PDF]

, 2006
A three-dimensional (3D) direct numerical simulation is combined with a laboratory study to describe the turbulent flow in an enclosed annular rotor-stator cavity characterized by a large aspect ratio G=(b-a)/h=18.32 and a small radius ratio a/b=0.152 ...
Anthony Randriamampianina, Canuto C., Itoh M., Owen J. M., Sébastien Poncet, Vanel J. M.   +5 more
core   +7 more sources

Comprehensive Coordinated Control Strategy of PMSG-Based Wind Turbine for Providing Frequency Regulation Services

IEEE Access, 2019
A high proportion of wind energy in modern power system requires wind turbines (WTs) to provide frequency regulation services. In this context, this paper proposes a comprehensive coordinated control strategy of permanent magnet synchronous generator ...
Xueyang Zeng, Tianqi Liu, Shunliang Wang, Yuqing Dong, Zhe Chen   +4 more
doaj   +1 more source

Cooperative Synthetic Inertia Control for Wind Farms Considering Frequency Regulation Capability

Frontiers in Energy Research, 2021
To fully utilize the frequency regulation (FR) capability of wind turbines (WTs) and to avoid a secondary frequency drop caused by the rotor speed recovery, this paper firstly proposes an FR capability evaluation method for wind farms based on the ...
Qiaoming Shi, Lei Liu, Yongping Wang, Yu Lu, Qiang Zou, Qingwu Zhang, Hongqing Liu   +6 more
doaj   +1 more source

Rotation in liquid $^4$He: Lessons from a toy model [PDF]

, 2000
This paper presents an analysis of a model problem, consisting of two interacting rigid rings, for the rotation of molecules in liquid $^4$He. Due to Bose symmetry, the excitation of the rotor corresponding to a ring of N helium atoms is restricted to ...
Callegari, Callegari, Callegari, Callegari, Conjusteau, Grebenev, Grebenev, Grebenev, Hartmann, Hartmann, Kevin K. Lehmann, Kwon, Lee, Leggett, Lehmann, Reynolds, Toennies   +16 more
core   +3 more sources

Momentum deficit and wake-added turbulence kinetic energy budgets in the stratified atmospheric boundary layer [PDF]

Physical Review Fluids
To achieve decarbonization targets, wind turbines are growing in hub height and rotor diameter, and they are being deployed in new locations with diverse atmospheric conditions not previously seen, such as offshore.
Kerry S. Klemmer, M. Howland
semanticscholar   +1 more source

Advanced Control Strategy of DFIG Wind Turbines for Power System Fault Ride Through [PDF]

, 2012
This paper presents an advanced control strategy for the rotor and grid side converters of the doubly fed induction generator (DFIG) based wind turbine (WT) to enhance the low-voltage ride-through (LVRT) capability according to the grid connection ...
Dong, Zhao Yang, Ostergaard, Jacob, Wong, Kit Po, Xu, Zhao, Yang, Lihui   +4 more
core   +2 more sources

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

Short-Term Frequency Response of a DFIG-Based Wind Turbine Generator for Rapid Frequency Stabilization

Energies, 2017
This paper proposes a short-term frequency-response scheme of a doubly-fed induction generator (DFIG)-based wind turbine generator (WTG) for improving rotor speed recovery and frequency nadir.
Dejian Yang, Moses Kang, Eduard Muljadi, Wenzhong Gao, Junhee Hong, Jaeseok Choi, Yong Cheol Kang   +6 more
doaj   +1 more source

Drag reduction within radial turbine rotor passages using riblets [PDF]

, 2018
In this paper, reducing the friction losses in a radial inflow turbine rotor surface by adding engineered features (riblets) is explored. Initially, computational fluid dynamics analysis was used to study the operating mechanism of riblets and to test ...
Khader, M. A., Sayma, A. I.
core   +1 more source

Photoswitching Conduction in Framework Materials

Advanced Functional Materials, EarlyView.
This mini‐review summarizes recent advances in state‐of‐the‐art proton and electron conduction in framework materials that can be remotely and reversibly switched on and off by light. It discusses the various photoswitching conduction mechanisms and the strategies employed to enhance photoswitched conductivity.
Helmy Pacheco Hernandez, Stefan Hecht, Wolfgang Wenzel, Lars Heinke, Mariana Kozlowska   +4 more
wiley   +1 more source