Results 91 to 100 of about 9,961 (184)

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

Recent extensions to the free-vortex-sheet theory for expanded convergence capability [PDF]

A new version of the free vortex sheet formulation is presented which has greatly improved convergence characteristics for a broad range of geometries. The enhanced convergence properties were achieved largely with extended modeling capabilities of the ...
Grantz, A. C., Hoffler, K. D., Luckring, J. M.   +2 more
core   +1 more source

The status of rotor noise technology: One man's opinion [PDF]

The problem of establishing the state of the technology is approached by first identifying the various characteristics of rotor noise and then assessing the state of technology in understanding and predicting the most important of these rotor noise ...
White, R. P., Jr.
core   +1 more source

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

The Problem of Adhesion Methods and Locomotion Mechanism Development for Wall-Climbing Robots

, 2019
This review considers a problem in the development of mobile robot adhesion methods with vertical surfaces and the appropriate locomotion mechanism design.
Bykov, Nikita V., Vlasova, Nataly S.
core  

A Comparative Study of the Mode-Decomposed Characteristics of the Asymmetricity of a Vortex Rope with Flow Rate Variation

Symmetry
In hydro turbines, the draft tube vortex rope is one of the most crucial impact factors causing pressure pulsation and vibration. It is affected by operating conditions due to differences in the flow rate and state and can be symmetric or asymmetric along the rotational direction. It may influence the stability of draft tube flow.
Shujing Li, Weilong Guang, Yang Yang, Puxi Li, Ruofu Xiao, Di Zhu, Faye Jin, Ran Tao   +7 more
openaire   +1 more source

Observations of the Electromagnetic Electron Kelvin‐Helmholtz Instability and Its Impact on the Dynamics Inside a Flux Rope

Geophysical Research Letters
The electromagnetic electron Kelvin‐Helmholtz instability (EM EKHI) and its impact on the dynamics inside a flux rope (FR) is investigated through observations from the Magnetospheric Multiscale mission.
K. Jiang, S. Y. Huang, Q. M. Lu, Z. G. Yuan, Q. Y. Xiong   +4 more
doaj   +1 more source

Design and Application of Portable Centrifuge Inspired by a Hand-Powered Spinning Top. [PDF]

Micromachines (Basel), 2023
Tang D, Duan Z, Liu L, Jia Z, Lang L, Tan Y.   +5 more
europepmc   +1 more source

A comprehensive investigation of hydraulic performance and internal flow characteristics of Francis turbine model at part load cavitating flow for various turbulence models

Engineering Applications of Computational Fluid Mechanics
Francis turbines are used extensively in hydropower facilities because of their great efficiency and versatility in a wider range of operations. In high specific speed turbines, part-load (PL) operations and cavitating conditions introduce highly complex
Mohammad Abu Shahzer, Duc-Anh Nguyen, Jin-Hyuk Kim   +2 more
doaj   +1 more source

Compilation of rocket spin data. Volume 2 - Literature survey Final report, Nov. 1966 - Aug. 1968 [PDF]

Literature survey of acceleration spin effects on solid propellant rocket ...
Manda, L. J.
core   +1 more source