Results 31 to 40 of about 1,253,627 (291)
Advances in Mechanical Engineering, 2016 For pump–turbines, most of the instabilities couple with high-level pressure fluctuations, which are harmful to pump–turbines, even the whole units. In order to understand the causes of pressure fluctuations and reduce their amplitudes, proper numerical ...
De-You Li +5 more
doaj +1 more source
A Model for Selecting the Most Cost-Effective Pressure Control Device for More Sustainable Water Supply Networks [PDF]
, 2019 Pressure Reducing Valves (PRV) have been widely used as a device to control pressure at nodes in water distribution networks and thus reduce leakages. However, an energy dissipation takes place during PRV operation.
Fernández García, I. +2 more
core +1 more source
The Physics of FluidsThe flow pattern evolution is particularly complicated in the low specific speed impeller of ultrahigh-head pump turbines. To reveal the mechanism of pressure pulsation induced by the inter-blade flow, the load rejection process of an ultrahigh-head ...
Xiaolong Fu +5 more
semanticscholar +1 more source
Transient Flow-Induced Stress Investigation on a Prototype Reversible Pump–Turbine Runner
EnergiesPump–turbine units with high heads are subjected to strong pressure pulsations from the unsteady transient flow in fluid channels, which can produce severe vibrations and high stresses on the pump–turbine structural components.
Dehao Zhang +5 more
doaj +1 more source
Scientific ReportsTransient changes in receiver heat are due to Direct Normal Irradiance (DNI) fluctuations, requiring operational strategies for receiver safety in cloudy weather.
Jing Nie +3 more
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Waveguide Photoactuators: Materials, Fabrication, and Applications
Advanced Robotics Research, EarlyView.Waveguide photoactuators convert guided light into mechanical motion. Their tethered‐flexible design enables minimally invasive surgery and confined‐space robotics. This review aims to guide materials selection, device design, and system integration, accelerating the transition of waveguide photoactuators from laboratory prototypes to versatile ...
Minjie Xi +4 more
wiley +1 more source
Cooling system for high speed aircraft [PDF]
, 1981 The system eliminates the necessity of shielding an aircraft airframe constructed of material such as aluminum. Cooling is accomplished by passing a coolant through the aircraft airframe, the coolant acting as a carrier to remove heat from the airframe ...
Lawing, P. L., Pagel, L. L.
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A superelement-based method for computing unsteady three-dimensional potential flows in hydraulic turbomachines [PDF]
, 1999 A numerical method is presented for the computation of unsteady, three-dimensional potential flows in hydraulic pumps and turbines. The superelement method has been extended in order to eliminate slave degrees of freedom not only from the governing ...
Esch, B.P.M. van +2 more
core +3 more sources
Trade-off analysis and design of a Hydraulic Energy Scavenger [PDF]
, 2012 In the last years there has been a growing interest in intelligent, autonomous devices for household applications. In the near future this technology will be part of our society; sensing and actuating will be integrated in the environment of our houses ...
Boero, Diego +4 more
core +2 more sources
Feasibility studies of a converter-free grid-connected offshore hydrostatic wind turbine [PDF]
, 2020 Owing to the increasing penetration of renewable power generation, the modern power system faces great challenges in frequency regulations and reduced system inertia.
Lin, Shuyue, Tong, Xin, Zhao, Xiaowei
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