Results 211 to 220 of about 3,909,091 (274)

Relation of changes in PEF and FEV₁ during bronchodilation in children. [PDF]

Eur Clin Respir J
Csonka LL, Tikkakoski A, Tikkakoski AP, Karjalainen J, Lehtimäki L.   +4 more
europepmc   +1 more source

Optimal placement of distributed generation to minimize power loss and improve voltage stability. [PDF]

Heliyon
Adegoke SA, Sun Y, Adegoke AS, Ojeniyi D.   +3 more
europepmc   +1 more source

Experimental trials of species-specific bat flight responses to an ultrasonic deterrent. [PDF]

PeerJ
Fritts SR, Guest EE, Weaver SP, Hale AM, Morton BP, Hein CD.   +5 more
europepmc   +1 more source

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Energy loss evaluation in a Francis turbine under overall operating conditions using entropy production method

Renewable Energy, 2021
The flow losses owing to friction and unstable flow patterns in Francis turbines will cause a drop in their efficiency. The traditional approach to evaluating the hydraulic losses of Francis turbine via the pressure drop cannot determine the exact ...
Zhi-Feng Yu, Wen-Quan Wang
exaly   +2 more sources

Assessment of erosion wear in low specific speed Francis turbine due to particulate flow

Advanced Powder Technology, 2023
Shubham Sharma, Bhupendra K Gandhi
exaly   +2 more sources

A technical review on combined effect of cavitation and silt erosion on Francis turbine

Renewable and Sustainable Energy Reviews
Prashant Kumar, S K Singal
exaly   +2 more sources

Optimal condition of simultaneous water and air injection in a Francis turbine in order to reduce vortices using experimental and numerical methods

Energy Conversion and Management, 2023
Ebrahim Hajidavalloo, Alireza Riasi
exaly   +2 more sources

Effect of water jet area on mitigation of vortex rope in a Francis turbine

The Physics of Fluids, 2023
The rotating vortex rope (RVR) is normally formed at part load operating conditions, which develops flow instability in the draft tube (DT) cone of a Francis turbine. The detrimental effects of RVR reduce the life and performance of the turbine.
Sandeep Kumar, B. Gandhi
semanticscholar   +1 more source

Internal flow stability of a Francis turbine under wide load operating range

The Physics of Fluids
Modern power systems, energy sources, often necessitate that hydropower turbines function across a broad load range. This requirement presents significant challenges to the stable operation of turbines designed based on rated operating parameters.
Haiqi Wang, Jiayang Pang, Zhenming Lai, Longchao Gan, Dong Huang, Hong Hua, Zhishun Yu, Xiaobing Liu   +7 more
semanticscholar   +1 more source

Influence of runner cone profile and axial water jet injection in a low head Francis turbine at part load

Sustainable Energy Technologies and Assessments, 2022
The part load operation of a Francis turbine generally develops a rotating vortex rope (RVR) in the draft tube, generating flow instabilities and pressure pulsations.
Surinder Kumar, B. Gandhi
semanticscholar   +1 more source