Thermodynamically consistent formulation of the properties of dry and metastable steam for computations of condensing flow in steam turbines

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Thermodynamically consistent formulation of the properties of dry and metastable steam for computations of condensing flow in steam turbines

Popis výsledku v původním jazyce

An accurate mathematical formulation of the thermodynamic properties of dry and metastable supersaturated steam is developed. The formulation enables fast computation of all properties, using mass density and specific internal energy as independent variables. This choice of independent variables follows the needs of non-stationary CFD computations of dry and metastable steam flows in steam turbines. The formulation comprises an ideal-gas part and a residual part. The residual part is expressed in a formanalogous to the virial equation of state but the coefficients are functions of internal energy, rather than temperature. Here we present a variant retaining only one coefficient of the density series, corresponding to the second virial coefficient. Theuncertainties of properties computed from the present formulation only slightly exceed those of the fundamental formulation IAPWS-95. The formulation is valid from 253.15 K to 1073.15 K. Up to pressures given by the isentrope 7.5 kJ/(kg

Název v anglickém jazyce

Thermodynamically consistent formulation of the properties of dry and metastable steam for computations of condensing flow in steam turbines

Popis výsledku anglicky

An accurate mathematical formulation of the thermodynamic properties of dry and metastable supersaturated steam is developed. The formulation enables fast computation of all properties, using mass density and specific internal energy as independent variables. This choice of independent variables follows the needs of non-stationary CFD computations of dry and metastable steam flows in steam turbines. The formulation comprises an ideal-gas part and a residual part. The residual part is expressed in a formanalogous to the virial equation of state but the coefficients are functions of internal energy, rather than temperature. Here we present a variant retaining only one coefficient of the density series, corresponding to the second virial coefficient. Theuncertainties of properties computed from the present formulation only slightly exceed those of the fundamental formulation IAPWS-95. The formulation is valid from 253.15 K to 1073.15 K. Up to pressures given by the isentrope 7.5 kJ/(kg

Druh

D - Stať ve sborníku

CEP obor

BJ - Termodynamika

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2012

Kód důvěrnosti údajů

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

Název statě ve sborníku

Baumann Centenary Conference

ISBN

978-0-903428-35-4

ISSN

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e-ISSN

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Počet stran výsledku

12

Strana od-do

1-12

Název nakladatele

Cambridge University Engineering

Místo vydání

Cambridge

Místo konání akce

Cambridge

Datum konání akce

10. 9. 2012

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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