An experimental study of the coarse droplets formation

Bartoš, Ondřej; Pavlíček, Petr; Měšťanová, Lucie

doi:10.1063/1.5138614

Cited by 2 publications

(4 citation statements)

References 5 publications

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“…However, for the improvement of measurement capabilities, wind tunnel simulating conditions in low pressure part of steam turbine was developed. Measurements in the tunnel showed bi-modal distribution of the coarse droplets and the corresponding Weber numbers were higher, than the critical Weber number from the theory [3]. Among published papers, this difference was measured also in similar wind tunnel [4,5] came with possible explanation.…”

Section: Introductionmentioning

confidence: 77%

“…This chapter is focused on description of similar experiments of water film breakup. Bartoš et al [3] performed measurement on the previously described measurement facility with transonic wind tunnel with results showing bi-modal distribution of the coarse droplets. The coarse droplets were divided into two groups with resulting average values of Weber number 𝑊𝑒 = 20 for small droplets and 𝑊𝑒 = 500 for big droplets.…”

Section: Hot Wire Measurementmentioning

confidence: 99%

“…al. [3], influenced by the wake downstream the trailing edge. The aim of this paper is to prove possibility of such explanation by using hot-wire measurement of the air flow velocity fluctuations.…”

Section: The Influence Of the Wake Downstream The Trailing Edgementioning

confidence: 99%

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A Study of the coarse droplet formation from the liquid film in steam turbines

Bartoš,

Huněk,

Antoš

2023

MATEC Web Conf.

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For all the deployment of the non-fossil energy sources the steam turbine remains the most important energy transforming device. In the current situation when the daily operation of the turbines is not predictable due to electricity supply from the photovoltaic and the wind power plants, the turbines work in the non-design conditions, the danger of the blade’s erosion caused by the coarse droplets is assumed. The purpose of this paper is to suggest the possible formation process of the coarse droplets in the steam turbine. The current studies were focused mostly on the measurement or identification of the coarse droplets in the steam turbine, but the explanation of the archived results was not sufficient. An analysis of the droplets formed in the wind tunnel indicates, for the majority of the measurements, the part of the formed droplets is bigger than the critical Weber number limit. Similar, but less detail, experience was achieved for measurement in the steam turbine. This paper introduces simple analysis of the optically measured coarse droplets size distribution with the modelled flow field behind the blade fitted by measured velocity field. A detailed hot wire measurement was performed in the vicinity of the trailing edge where the liquid film is disrupted to the coarse droplets.

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Section: Introductionmentioning

confidence: 77%

Section: Hot Wire Measurementmentioning

confidence: 99%

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A Study of the coarse droplet formation from the liquid film in steam turbines

Bartoš,

Huněk,

Antoš

2023

MATEC Web Conf.

Self Cite

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“…2) of the flow in the wind tunnel was performed in order to have better knowledge of the flow field in the nozzle. The results of the simulation presented in the paper [8] show a complex flow field where in some regions, mainly behind the aerofoil, the velocity exceeds the speed of sound but in vicinity of the blade, the flow is subsonic. On the aerofoil, there is a small gap for supplying liquid on its surface.…”

Section: Testing Equipmentmentioning

confidence: 91%

An Analysis of the Liquid Films Break-Up Using the Computer Vision Technique

Měšťanová

Bartoš

2021

Acta Polytech

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The aim of this paper is to introduce a novel approach for analysing the droplet formation in a transonic flow. The method suggested in this work is based on the combination of the measured data from the wind tunnel by an optical measurement and image processing. A new wind tunnel was developed for the study of the liquid film atomization at high speed flows similar to ones that can be found in steam turbines. The coarse droplets in steam turbines are formed from the liquid films on the blades and inner casings. The coarse droplets formed on the stator blades don´t follow the bulk flow and collide with the following moving blades. These collisions cause erosion and corrosion processes, which have an unfavourable effect on the reliability and the efficiency of the low pressure stages of steam turbines. The tunnel is equipped with a standard instrumentation for the measurement of the flow properties and for the analysis of the size distribution of the droplets. Two measurement methods were used for the measurement of the size of the droplets, photogrammetry and light scattering. In this paper, the image processing of the captured images is discussed. The images were taken by a camera with a telecentric lens. The paper contains an assessment of three image processing methods used for the measurement of the droplet distribution by the light extinction. Moreover, the formation of the droplets is captured on the trailing edge of the profile in the flow. The results bring a new view on the formation of droplets at high speeds.

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An experimental study of the coarse droplets formation

Cited by 2 publications

References 5 publications

A Study of the coarse droplet formation from the liquid film in steam turbines

A Study of the coarse droplet formation from the liquid film in steam turbines

An Analysis of the Liquid Films Break-Up Using the Computer Vision Technique

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