Results 201 to 210 of about 182,944 (226)

Influence of Wet Steam on the Five-Stage Steam Turbine Efficiency

Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines, 2018
In the paper the behaviour of the five-stage experimental steam turbine 10 MW is described during the expansion transition from superheated steam to wet steam as well as the influence of wet steam on the flow path efficiency. The influence of wet steam occurrence on one to four last stages is given by setting the inlet steam parameters.
Michal Hoznedl, Michal Kolovratník, Ladislav Tajč, Andreas P. Weiß, Lukáš Mrózek   +4 more
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A metastable wet steam turbine stage model

Nuclear Engineering and Design, 2002
A model for the prediction of the efficiency of axial flow steam turbine stage is described, where the flow through turbine cascade is considered non-homogeneous and metastable. At the exit an oblique shock brings it to equilibrium. The losses in the cascade are expressed according to Dunham and Came (Trans. ASME (1970)) and Kacker and Okapuu (J.
Wageeh Sidrak Bassel, Arivaldo Vicente Gomes   +1 more
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Paper 3: Nuclear Wet-Steam Turbines

Proceedings of the Institution of Mechanical Engineers, Conference Proceedings, 1968
Turbines which operate on steam initially slightly wet are required by several varieties of nuclear reactor at present in service. Such turbines differ substantially from conventional fossil-fuel turbines and special measures are necessary to avoid erosive damage and to achieve reasonable efficiency.
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Property definition in equilibrium wet steam

International Journal of Mechanical Sciences, 1964
Summary Equilibrium wet steam is a non-Newtonian fluid, and the meaning of the term “velocity” is obscure when a condition of slip is occuring. This paper explores the problems involved in framing a definition of velocity, and indicates the value of the concept of an equivalent filament, a device which also assists the definition of dryness fraction.
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Unsteady Wetness Effects in LP Steam Turbines

Volume 7: Turbomachinery, Parts A, B, and C, 2011
One of the unresolved issues for condensing flow in large steam turbines is correct prediction of the droplet size distribution. Optical measurements taken in the later stages of LP steam turbines have shown that the time-averaged droplet size spectra are much broader with larger average diameters than predicted by most theoretical and computational ...
Kane D. Chandler, Alexander J. White, John B. Young   +2 more
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Nozzle Shape Optimization for Wet-Steam Flows

19th AIAA Computational Fluid Dynamics, 2009
The present work investigates the feasibility of a methodolody for the shape optimization of wet-steam nozzles. This is done by means of a wet-steam flow solver coupled with a multi-objective genetic algorithm. A moment method is used to describe the evolution of liquid droplets. The droplet size distribution is partially modelled by means of transport
Congedo, Pietro Marco, Cinnella, P., Giordano, Michele   +2 more
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Optical Measurement of Wet Steam in Turbines

Journal of Engineering for Gas Turbines and Power, 1998
The wetness fraction of steam causes dangerous erosion of turbine blades and other components, and decreases efficiency of stages. The instrumentation of wet steam has, therefore, attracted growing interest from the point of safety and economical operation of power stations. Based on the light scattering technique, a method is presented that is capable
N. N. Wang, J. M. Wei, X. S. Cai, Z. W. Zhang, G. Zheng, X. H. Yu   +5 more
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Critical Flow Properties of Wet Steam

Proceedings of SPE International Thermal Operations Symposium, 1993
ABSTRACT Wet steam, being a two-phase fluid, has complex critical flow properties. Analytical and experimental data were used to investigate the critical steam flux, and the pressure ratio needed to achieve critical flow for a variety of popular flow-rate controlling devices.
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Control of wetness fraction and liquid droplet size in wet steam two phase flows with hot steam injection

Meccanica, 2017
The sudden expansion of steam in the last stages of turbines causes a nucleation process to take place and liquid droplets to appear. Parts of these droplets, which grow collide with the blades and seriously damage them. This mechanical destruction also coincides with a thermodynamic shock which suddenly increases the pressure and reduces the ...
Mohadeseh Sadat Mirhoseini, Masoud Boroomand   +1 more
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An investigation of electrostatic phenomena associated with flowing wet steam with particular reference to the wet steam turbine

International Journal of Heat and Fluid Flow, 1980
Abstract A wet steam tunnel was constructed to simulate the ineteraction of liquid and vapour in order to investigate the nature and origin of static electrification phenomena which occur within wet steam turbines. The tunnel was operated at 0·17 bar pressure with steam velocity up to 290 m/s.
D.J. Ryley, F.P. Loftus
openaire   +1 more source