scholarly journals INFLUENCE OF FLOTATION BODIES ON THE POWER CHARACTERISTICS OF A FREE-STREAM WATER WHEEL

2017 ◽  
Author(s):  
OLIVIER CLEYNEN ◽  
EMEEL KERIKOUS ◽  
STEFAN HOERNER ◽  
DOMINIQUE THÉVENIN
Keyword(s):  
Free Stream ◽  
Stream Water ◽  
Power Characteristics ◽  
Water Wheel

Optimal design for the free-stream water wheel: A two-dimensional study

Energy ◽  
2021 ◽  
Vol 214 ◽  
pp. 118880
Author(s):  
Olivier Cleynen ◽  
Sebastian Engel ◽  
Stefan Hoerner ◽  
Dominique Thévenin
Keyword(s):  
Optimal Design ◽  
Free Stream ◽  
Stream Water ◽  
Two Dimensional ◽  
Water Wheel

Characterization of the performance of a free-stream water wheel using computational fluid dynamics

Energy ◽  
2018 ◽  
Vol 165 ◽  
pp. 1392-1400 ◽  
Author(s):  
Olivier Cleynen ◽  
Emeel Kerikous ◽  
Stefan Hoerner ◽  
Dominique Thévenin
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Free Stream ◽  
Stream Water ◽  
Water Wheel

Control of global instability in a non-parallel near wake

2000 ◽  
Vol 404 ◽  
pp. 345-378 ◽  
Author(s):  
TZONG-SHYNG LEU ◽  
CHIH-MING HO
Keyword(s):  
Free Stream ◽  
Stream Water ◽  
Parallel Flow ◽  
Free Stream Velocity ◽  
Splitter Plate ◽  
Wake Flow ◽  
Stream Velocity ◽  
Global Instability ◽  
Unstable Flow ◽  
Trailing Edge

The effect of base suction on a plane wake was found to produce significant changes in wake dynamics. The wake is produced by merging two boundary layers from the trailing edge of a splitter plate in a two-stream water tunnel. A threshold suction speed exists which is approximately equal to half of the free-stream velocity. If the suction speed is below the threshold, the wake flow is unstable. If the suction speed is above the threshold, the wake becomes stable and no vortex shedding is observed. In the present experiment, the suction technique can stabilize a wake at a maximum tested Reynolds number of 2000.The suction significantly reduces the length of the absolutely unstable region in the immediate vicinity of the trailing edge of the splitter plate and produces a non-parallel flow pattern, resulting in the breakdown of global instability. The global growth rate changes from positive (unstable flow) to negative (stable flow) at the suction speed equalling 0.46 of the free-stream velocity. The threshold suction speed can be accurately predicted by the global linear theory of Monkewitz et al. (1993) with a non-parallel flow correction.

scholarly journals Numerical investigation on effect of blade shape for stream water wheel performance.

2018 ◽  
Vol 342 ◽  
pp. 012066
Author(s):  
N F Yah ◽  
A N Oumer ◽  
A A Aziz ◽  
I M Sahat
Keyword(s):  
Numerical Investigation ◽  
Stream Water ◽  
Blade Shape ◽  
Water Wheel

Heat, Mass, and Momentum Transfer During the Melting of Glacial Ice in Sea Water

1973 ◽  
Vol 95 (3) ◽  
pp. 317-323 ◽  
Author(s):  
O. M. Griffin
Keyword(s):  
Momentum Transfer ◽  
Boundary Layers ◽  
Sound Speed ◽  
Free Stream ◽  
Sea Water ◽  
Saline Water ◽  
Stream Water ◽  
Flow Conditions ◽  
Glacial Ice ◽  
Melting Surface

The velocity, temperature, and concentration distributions near a melting surface of glacial, or pure, ice in saline water are determined for laminar flow conditions using integral techniques. Estimates are made of the relative thicknesses of the momentum, thermal, and mass diffusion boundary layers for a variety of the appropriate flow and thermal parameters. These findings are applied to the melting of glacial ice in sea water, but they also are applicable to other systems in which heat, mass, and momentum transfer occur simultaneously with phase transformation. The speed of sound at constant pressure in sea water is a function of temperature and salinity, and the variation of sound speed with changing environmental conditions plays an important role in underwater acoustic propagation. The results of the heat and mass transfer analyses are employed to determine the sound speed profiles within the temperature and salinity boundary layers near the melting glacial ice for free-stream water temperatures of 5 and 10 deg C.

Effects of Injection on Condensation on a Film-Cooled Surface

1987 ◽  
Author(s):  
William Phil Webster ◽  
Savash Yavuzkurt
Keyword(s):  
Boundary Layer ◽  
Water Vapor ◽  
Turbulent Boundary Layer ◽  
Gas Turbine ◽  
Turbine Blade ◽  
Free Stream ◽  
Stream Water ◽  
Turbine Blades ◽  
Stream Velocity ◽  
Test Surface

Gas turbine blades have previously been shown to corrode due to condensation of sulfide vapor on a cooled blade surface. In the present investigation, water vapor was condensed on a film cooled surface, simulating the condensation of sulfide vapor on a turbine blade. The injection section consisted of one row of holes (inner diameter of 1.0 cm) inclined 30 degrees with the surface and inline with the main turbulent boundary layer flow. Experiments were carried out in a subsonic, zero pressure gradient, turbulent boundary layer with free stream velocities of 10.5, 15.75, and 21.0 m/sec. A cooling fluid (water at near 0°C) was circulated through the plate, cooling the test surface and causing free stream water vapor to condense. Measurements were made at three Reynolds numbers (based on hole diameter and free stream velocity): 7,000, 10,500, and 14,000; and at three blowing ratios: 0.4, 0.8, 1.2. The results show the existence of a “dryout” region downstream of each cooling hole. This region was dry while regions between the jets had water on the surface. This dryout region was triangularly shaped, with the apex as much as 30 jet diameters from the downstream edge of the jet. For each Reynolds number the lowest blowing ratio (M = 0.4) had the largest dryout region. These results indicate that injection can be used to prevent condensation of corrosive vapors on a film-cooled gas turbine blade.

4113 Power characteristics of the water wheel in Edo era for Blast furnace blower

2008 ◽  
Vol 2008.5 (0) ◽  
pp. 423-424
Author(s):  
Hideki ONODERA
Keyword(s):  
Blast Furnace ◽  
Power Characteristics ◽  
Water Wheel

Improved Wind and Water Wheel

1859 ◽  
Vol 1 (9) ◽  
pp. 136-136
Keyword(s):  
Water Wheel

DEPENDENCES OF POWER CHARACTERISTICS OF CIRCUIT AT CHARGE OF SUPERCAPACITORS

2016 ◽  
Vol 2016 (1) ◽  
pp. 3-10 ◽  
Author(s):  
O.A. Beletsky ◽  
◽  
N.I. Suprunovska ◽  
A.A. Shcherba ◽  
◽  
...  
Keyword(s):  
Power Characteristics
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