Results 81 to 90 of about 418 (177)

Actuation Strategies for Underwater Jet‐Propelled Soft Robots

Journal of Field Robotics, EarlyView.
ABSTRACT This review article examines jet‐propulsion mechanisms in underwater soft robotic systems, focusing exclusively on physically fabricated and experimentally validated robots. Covering research published from 2013 to 2025, this study classifies and evaluates jet‐propulsion robots based on their actuation mechanisms.
Angel Kitone, Mohammed Anteet, Pawandeep S. Matharu, Yara Almubarak   +3 more
wiley   +1 more source

Computational Fluid Dynamics Analysis of Draft Tube Flow Characteristics in a Kaplan Turbine

Actuators
This study presents a numerical investigation of the internal flow characteristics within the draft tube of a Kaplan turbine using computational fluid dynamics (CFD).
Qinwen Yan, Zhiqiang Xiong, Yuan Zheng, Chen Feng, Zhen Li, Lin Hu, Lianchen Xu   +6 more
doaj   +1 more source

Experimental Investigation on the Characteristics of Hydrodynamic Stabilities in Francis Hydroturbine Models

Advances in Mechanical Engineering, 2014
This paper presents an experimental investigation of flow phenomena related to the characteristic frequencies of pressure fluctuation in Francis hydroturbine models.
Wen-Tao Su, Xiao-Bin Li, Feng-Chen Li, Xian-Zhu Wei, Wen-Fu Han, Shu-Hong Liu   +5 more
doaj   +1 more source

Pressure Fluctuations in the S-Shaped Region of a Reversible Pump-Turbine

Energies, 2017
Numerical simulations were performed to investigate pressure fluctuations in the S-shaped region of a pump-turbine model. Analyses focused on pressure fluctuations in the draft tube and in the gap between the guide vanes and runner.
Zijie Wang, Baoshan Zhu, Xuhe Wang, Daqing Qin   +3 more
doaj   +1 more source

Modal analysis of vortex rope using dynamic mode decomposition

Physics of Fluids
The decelerating swirling flow in the draft tube of hydraulic turbines at part load conditions often results in a self-induced instability known as vortex rope. This phenomenon is associated with detrimental pressure pulsations in the hydropower system that need to be mitigated.
Saeed Salehi, Håkan Nilsson
openaire   +2 more sources

Machine learning‐driven advances in carbon‐based quantum dots: Opportunities accompanied by challenges

Responsive Materials, EarlyView.
Machine learning provides a unifying framework to connect structure, fluorescence properties, and applications of carbon‐based quantum dots. This review highlights how data‐driven strategies enable fluorescence regulation, reveal underlying mechanisms, and accelerate the rational design of functional carbon dots.
Liangfeng Chen, Siwei Yang, Xiangqian Cui, Ziheng Liu, Hang Wang, Yongqiang Li, Peng He, Miao Wang, Guqiao Ding   +8 more
wiley   +1 more source

Optical skipping rope induced transverse OAM for particle orbital motion parallel to the optical axis. [PDF]

Nanophotonics, 2023
Zhu L, Zhang X, Rui G, He J, Gu B, Zhan Q.   +5 more
europepmc   +1 more source

A parametric study of axial flow jets for mitigation of vortex rope instabilities

IOP Conference Series: Earth and Environmental Science
Abstract Hydraulic turbines are typically designed to operate continuously at their optimal efficiency. However, the growing reliance on intermittent energy sources has resulted in more frequent operation under transient and off-design conditions, which increases stress on the turbines and shortens their lifespan.
Saeed Salehi, Håkan Nilsson
openaire   +1 more source

Spectral Techniques for Solving PDE Stability Model of Vortex Rope

, 2012
In this paper spectral methods are applied to investigate the hydrodynamic instability of swirling flow with application to Francis hydraulic turbine. Spectral methods imply representing the problem solution as truncated series of smooth global functions.
openaire   +2 more sources

Research on a Wire Rope Breakage Detection Device for High-Speed Operation Based on the Multistage Excitation Principle. [PDF]

Sensors (Basel), 2023
Zhou Z, Zhang X, Deng R, Han L, Zhou M, Ma Z, Chang X, Peng Y.   +7 more
europepmc   +1 more source