Computational and experimental studies of the effect of steam ionization on the parameters of a wet-steam flow in a supersonic nozzle

2016 ◽  
Vol 19 (2) ◽  
pp. 3-10
Author(s):  
A. Tarelin ◽  
◽  
V. Orlovskiy ◽  
A. Kovalev ◽  
A. Nechayev ◽  
...  
Keyword(s):  
Supersonic Nozzle ◽  
Experimental Studies ◽  
Steam Flow ◽  
Wet Steam ◽  
Wet Steam Flow

Numerical modeling and high-order scheme for wet steam flow

2015 ◽  
Vol 230 (11) ◽  
pp. 1846-1860 ◽  
Author(s):  
Zhirong Lin ◽  
Xin Yuan
Keyword(s):  
Supersonic Nozzle ◽  
Three Dimensional ◽  
High Order ◽  
Process Models ◽  
Steam Flow ◽  
Droplet Growth ◽  
Wet Steam ◽  
High Order Scheme ◽  
Order Scheme ◽  
Wet Steam Flow

A mathematical model of three-dimensional nonequilibrium condensing wet-steam flow is established in Eulerian form, based on conservation laws for a mixture of steam and water droplets. The method of moments is introduced in modeling the droplet spectrum. To describe the nonequilibrium condensing process, models for classical nucleation and enhanced droplet growth are applied. A special high-order implicit scheme is constructed for this condensing flow model. Tables based on IAPWS-IF97 formulae are used in solving the thermal properties of wet steam. The numerical results for a two-dimensional supersonic nozzle and a low-pressure steam turbine stage are compared with experimental data. The good agreement indicates the effectiveness of the condensation model and numerical scheme.

Features of liquid phase movement in the inter-blade channel of nozzle blade cascade

2017 ◽  
Vol 232 (5) ◽  
pp. 452-460 ◽  
Author(s):  
Vladimir Gribin ◽  
Ilya Gavrilov ◽  
Aleksandr Tishchenko ◽  
Victor Tishchenko ◽  
Vitaliy Popov ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Laser Diagnostics ◽  
Experimental Studies ◽  
Correlation Method ◽  
Leading Edge ◽  
Steam Flow ◽  
Wet Steam ◽  
Blade Cascade ◽  
Wet Steam Flow ◽  
Nozzle Blade

The experimental results of wet steam flow in the blade channel of flat nozzle blade cascade have been considered in the paper. The aim of this work is to study the motion of liquid droplets inside the inter-blade channel. Experimental studies were performed on installation circuit of wet steam. In order to obtain velocity fields of droplets in investigated channel, the laser diagnostics system was used. It carries out the cross-correlation method—particle tracking velocimetry. Numerical simulation of wet steam flow in studied channel was performed. According to the obtained data, the main features of the droplets motion in the blade channel have been revealed. Basic droplets streams and the sources of their appearance have been determined. The process of deposition and breakdown of the droplets on the surface of the blades have been studied. It is shown that reflected region of droplets (“fountain”) is formed around the leading edge. The experimental data were compared with the results of numerical simulation of the droplets motion in the flat nozzle blade cascade.

High Pressure Subsonic Nucleation in 1D Nozzles — An Experimental Study

2014 ◽  
Author(s):  
Tao Guo ◽  
Mark Burnett ◽  
Norman Turnquist ◽  
Francisco Moraga
Keyword(s):  
Experimental Study ◽  
High Pressure ◽  
Wilson Line ◽  
Experimental Studies ◽  
Steam Flow ◽  
Steam Turbines ◽  
Wet Steam ◽  
Flow Conditions ◽  
Test Rig ◽  
Wet Steam Flow

The presence of moisture in steam turbines is known to cause blade erosion and reduce turbine performance. As a result, nucleating wet steam flow has been the topic of both academic and engineering research for many decades. However, almost all of the previous experimental studies on steam nucleation have been carried out under low pressure supersonic flow conditions, either in converging-diverging (Laval) nozzles or in supersonic airfoil cascades. Some recent experimental studies conducted droplet size/wetness measurements within actual turbines, but these tests in general only give qualitative assessment on the nucleation phenomena. They are not intended to study the mechanisms of the nucleating steam flow. In this paper, an experimental study of nucleating wet steam flow under high-pressure subsonic flow conditions is presented. In particular, the world’s first high-pressure subsonic nucleation test rig was designed and built at the GE Global Research Center. This advanced test rig takes high pressure (up to 1000 psia) clean steam with controlled inlet superheat and expands it through 1D subsonic nozzles. The Wilson line location and the length of the nucleation zone are controlled through different combinations of inlet steam pressure and superheat, and overall pressure ratios. An advanced optical measurement system was developed and used to measure the Wilson line, the ensuing condensation zone, and the droplet size and number density generated from nucleation. The flow path in the nozzle is visible through specially designed sapphire windows. The optical system is essentially comprised of two laser-photodiode pairs (405 nm and 689 nm wavelength), which can be traversed along the length of the nozzle. The experiment data have indicated that significant differences exist between high pressure subsonic nucleation and low pressure supersonic nucleation. Further, an in-house 1D analytical tool as well as a 3D multiphase CFD have been used to model the test runs, and reasonable agreements have been obtained. This study has direct application in the design of Nuclear and Concentrated Solar high pressure steam turbines.

Wet steam flow and condensation loss in turbine blade cascades

2021 ◽  
Vol 189 ◽  
pp. 116748
Author(s):  
Chuang Wen ◽  
Yan Yang ◽  
Hongbing Ding ◽  
Chunqian Sun ◽  
Yuying Yan
Keyword(s):  
Turbine Blade ◽  
Steam Flow ◽  
Wet Steam ◽  
Wet Steam Flow

A fast response miniature probe for wet steam flow field measurements

2016 ◽  
Vol 27 (12) ◽  
pp. 125901
Author(s):  
Ilias Bosdas ◽  
Michel Mansour ◽  
Anestis I Kalfas ◽  
Reza S Abhari
Keyword(s):  
Flow Field ◽  
Field Measurements ◽  
Fast Response ◽  
Steam Flow ◽  
Wet Steam ◽  
Wet Steam Flow

Some Experiments on Wet Steam Flow Visualization in Large Steam Turbine Blading

1976 ◽  
Vol 98 (3) ◽  
pp. 573-577 ◽  
Author(s):  
J. Krzyz˙anowski ◽  
B. Weigle
Keyword(s):  
Steam Turbine ◽  
Steam Flow ◽  
Light Sources ◽  
Phase Flow ◽  
Wet Steam ◽  
Experimental Conditions ◽  
Advantages And Disadvantages ◽  
Primary Droplet ◽  
Last Stage ◽  
Wet Steam Flow

In a series of experiments aimed at the visualization of the wet steam flow in the exhaust part of a 200 MW condensing steam turbine a set of periscopes and light sources was used. The aim of the experiment was: 1 – The investigation of the liquid-phase flow over the last stage stator blading of the turbine mentioned. 2 – The investigation of the gaseous-phase flow through the last stage blading at full and part load. The first part of the program partially failed due to the opaqueness of the wet steam atmosphere for the turbine load higher than 10–20 MW. The detailed experimental conditions will be described. An assessment of the primary droplet size will also be given. The preliminary results of the second part of the program will be outlined. The advantages and disadvantages of the equipment used will be discussed.

A novel method for measuring the coarse water droplets in wet steam flow in steam turbines

2001 ◽  
Vol 10 (2) ◽  
pp. 123-126 ◽  
Author(s):  
Xiaoshu Cai ◽  
Lili Wang ◽  
Yongzhi Pan ◽  
Xin Ouyan ◽  
Jianqi Shen
Keyword(s):  
Steam Flow ◽  
Steam Turbines ◽  
Wet Steam ◽  
Water Droplets ◽  
Novel Method ◽  
Wet Steam Flow

Correction of non-isokinetic sampling of wetness measurement for wet steam flow

2002 ◽  
Vol 11 (1) ◽  
pp. 41-48
Author(s):  
Yanfeng Li ◽  
Junmei Li ◽  
Heng Jia ◽  
Xinjun Wang ◽  
Tingxiang Xu
Keyword(s):  
Steam Flow ◽  
Wet Steam ◽  
Wet Steam Flow
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