Abstract
For measuring the fine droplets properties in the wet steam expanding in the steam turbines the light extinction probes are usually used. The paper presents CFD modelling of the extinction probe influence on the wet steam flow field at the measurement position. The aim is to get a basic information about the influence of the flow field deviation on the measured data, in other words, of necessity to correct the measured data. The basic modelling procedure is described, as well as the supposed simplifications and the factor considering the change in the steam density in the measuring slot of the probe. The model is based on the experimental data that were achieved during the developmental measurements in the steam turbine 1090 MW in the power station Temelin. The experimental measurement was done in the cooperation with the Doosan Skoda Power s.r.o.
Highlights
Experimental research of the liquid phase of the wet steam expanding in a steam turbine is a challenging problem
In the Czech Republic has been developed such an optical measuring system at Czech Technical University in Prague (CTU) and used for research and development purposes in the low pressure parts of the steam turbines in the classical and nuclear power plants. These measurements have been mostly done in close cooperation with Doosan Škoda Power s.r.o. (DŠP)
It is expressed by known Lambert-Beer Law: ଵ κ where Ɛ is the length of the measuring beam of the probe, I0 intensity of light on the inlet of the measuring volume, I intensity of light on the outlet of the measuring volume, Nv is a number of droplets in the volume unit, Q(SD/O) coefficient of light extinction according to Mie theory [3], O is wavelength of light, D is droplets diameter, M(D) normalized droplets size distribution
Summary
Experimental research of the liquid phase of the wet steam expanding in a steam turbine is a challenging problem. In the Czech Republic has been developed such an optical measuring system at Czech Technical University in Prague (CTU) and used for research and development purposes in the low pressure parts of the steam turbines in the classical and nuclear power plants. These measurements have been mostly done in close cooperation with Doosan Škoda Power s.r.o. For the fine droplets size distribution measurement the extinction probes are commonly used Their development in line with global trends can be described by gradual minimization of the dimensions and application of the modern optical and electronic elements
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