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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20303 - Thermodynamics

Projekt

<a href="/cs/project/TN02000025" target="_blank" >TN02000025: Národní centrum pro energetiku II</a><br>

Návaznosti

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

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název statě ve sborníku

ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition

ISBN

978-0-7918-8704-2

ISSN

—

e-ISSN

—

Počet stran výsledku

12

Strana od-do

—

Název nakladatele

ASME

Místo vydání

—

Místo konání akce

Boston, Massachusetts, USA

Datum konání akce

1. 1. 2023

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—