Pressure Loss Analysis and its Prediction in Typical Valve Designs for Steam Turbines

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49193864%3A_____%2F23%3AN0000003" target="_blank" >RIV/49193864:_____/23:N0000003 - isvavai.cz</a>

Result on the web

<a href="https://asmedigitalcollection.asme.org/GT/proceedings-abstract/GT2023/87042/V010T20A004/1168254" target="_blank" >https://asmedigitalcollection.asme.org/GT/proceedings-abstract/GT2023/87042/V010T20A004/1168254</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1115/GT2023-101134" target="_blank" >10.1115/GT2023-101134</a>

Result language

angličtina

Original language name

Pressure Loss Analysis and its Prediction in Typical Valve Designs for Steam Turbines

Original language description

Pressure loss analysis in valve assemblies for steam turbines has always been one of the traditional issues in order to enhance the valve design to ensure safe operation, reasonable price, and, especially, reduce pressure losses hence increasing the whole turbine output. Besides, during the preliminary turbine design, the efficiency should be predicted as accurately as possible. For this reason, the results based on a comprehensive range of measurements and numerical simulations should be compared with a general flow theory in the valves. Although many results have already been presented, the theoretical analysis and its confrontation with experimental and numerical results in the form of total loss and flow contraction coefficients have not been presented so far. It is the primary motivation of this paper. The total loss coefficient in the valve is compared with the total loss coefficient in the diffuser with and without flow detachment. Differences are described in the form of loss increase coefficient in the valve. Furthermore, in order to describe the influence of wakes and flow field non-uniformity under the valve cone, the flow contraction coefficient is introduced. The analysis is carried out on the two most typical valve assemblies: an assembly with one control valve in the chamber and an assembly with two control valves in the chamber. Data were obtained from measurements on the valve model and numerical simulations. The measurements were carried out on a valve model installed in an in-draft wind tunnel for high speeds in the Aerodynamic laboratory of the Institute of Thermomechanics of the Czech Academy of Sciences. The numerical simulations were carried out in the Doosan Skoda Power Company using a package of ANSYS software tools. Evaluated data complement each other. Generalized results allow us to easily predict mass flows and pressure losses and compare different valve designs from the efficiency point of view.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20303 - Thermodynamics

Project

<a href="/en/project/TN02000025" target="_blank" >TN02000025: National Centre for Energy II</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition

ISBN

978-0-7918-8704-2

ISSN

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e-ISSN

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Number of pages

12

Pages from-to

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Publisher name

ASME

Place of publication

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Event location

Boston, Massachusetts, USA

Event date

Jan 1, 2023

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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