Results 241 to 250 of about 1,539,229 (306)

Structure Design Draft Tube of Xiaoshankou Hydropower Station

Applied Mechanics and Materials, 2012
This The draft tube is one of the main load-bearing structure of the hydropower plant, The hydropower draft tube of Xiaoshankou is an underground space structure, mainly composed by the taper pipe segment, elbows segment and diffusion segment. This paper describe the structure design and calculation process of Xiaoshankou hydropower draft tube ...
null Kang Yingbin, Abdurxt Rjap, null Huang Kun   +2 more
openaire   +1 more source

Comparative Tests on Experimental Draft-Tubes

Transactions of the American Society of Civil Engineers, 1924
This paper gives the results of tests, made at the Alden Hydraulic Laboratory, on twelve model draft-tubes, to determine the relative efficiencies of drafttubes of different types under the hydraul...
C. M. Allen, I. A. Winter
openaire   +1 more source

Investigation of Rotating Vortex Rope formation during load variation in a Francis turbine draft tube

, 2020
Rotating Vortex Rope (RVR) has been a matter of focus for years due to the major effects on hydraulic turbine’s efficiency. The exact procedure of RVR formation is still vague.
N. Sotoudeh, R. Maddahian, M. Cervantes
semanticscholar   +1 more source

Economic Draft-Tube Proportions

Journal of Fluids Engineering, 1941
Abstract The purpose of this paper is to illustrate a new method whereby the most efficient and also the most economical proportions of a draft tube for a water-turbine installation may be found. A study is made of the excavation and concrete costs, as the ratios of draft-tube width to runner diameter and draft-tube depth to runner ...
openaire   +1 more source

Vibration of Water-Turbine Draft Tubes

Journal of Engineering for Power, 1961
The vibration in the draft tube of a water turbine is most severe when the turbine is running on part load. This is caused principally by the vortex core of whirling water in the draft tube. The theoretical and experimental investigations of the frequency and force of periodic vibration caused by the vortex core are described, and there is ...
openaire   +1 more source

Enteral Tube Feeding Dysphagic Stroke Patients (DRAFT)

2018
This chapter discusses the results of randomized controlled trials evaluating the benefits of early feeding for patients who suffered an acute stroke. The study was divided in two different groups: the first one compared early feeding versus avoiding nutrition, and the second compared percutaneous endoscopic gastrostomy versus nasogastric tube feeding ...
Francisco Loaiciga, Rony Dev
openaire   +1 more source

A method of evaluating the vortex rope strength in draft tube of Francis turbine

, 2020
A precessing vortex core in the draft tube of Francis turbine is considered as unstable flow conditions and the cause of many undesirable system instabilities for hydraulic power stations.
Huan Cheng, Lingjiu Zhou, Q. Liang, Z. Guan, De-min Liu, Zhaoning Wang, W. Kang   +6 more
semanticscholar   +1 more source

Study on the method of reducing the pressure fluctuation of hydraulic turbine by optimizing the draft tube pressure distribution

, 2020
Francis turbines within hydropower plants are required to operate under off-design conditions to meet the grid demand and ensure stability. In line with this, part-load conditions are generally accompanied with draft tube vortex rope appearance and ...
W. Su, Dr. Maxime Binama, Yang Li, Yue Zhao   +3 more
semanticscholar   +1 more source

Drying of Suspensions in the Draft Tube Spouted Bed

The Canadian Journal of Chemical Engineering, 2004
AbstractA draft tube spouted bed dryer with inert particles was used for drying suspensions. The effects of the operating conditions on dryer throughput and product quality were investigated. Experiments were performed in a cylindrical column 215 mm in diameter with a draft tube 70 mm in diameter and 900 mm in length.
Arsenijević, Zorana Lj., Grbavčić, Željko B., Garić-Grulović, Radmila V.   +2 more
openaire   +2 more sources

Origin of the synchronous pressure fluctuations in the draft tube of Francis turbines operating at part load conditions

Journal of Fluids and Structures, 2019
The synchronous pressure surge effect is a critical phenomenon occurring in Francis turbines operating at part load conditions. In this regime, pressure fluctuations are predominantly coming from the temporal rotation of a single helical vortex inside ...
S. Pasche, F. Gallaire, F. Avellan
semanticscholar   +1 more source