Reduction of fluid property errors of various thermohydraulic codes for supercritical water systems
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A. R. Imre
Abstract
Various thermohydraulic codes (like WAHA, ATHLET, RELAP) work perfectly for pressurized water and steam, but fail to give reliable results for supercritical water. This might be a surprise, because theoretically Supercritical Water (SCW) should be a simpler system than normal water, due to the lack of phase transition and two-phase flow in the supercritical region. Some of the problem is caused by low accuracy of the fluid properties due to the presence of the pseudo-critical line. In this presentation we would like to address this pseudocriticality-related problem and to establish a method for the error-reduction.
Kurzfassung
Aktuelle thermohydraulische Programmsysteme eignen sich sehr gut zur Berechnung der thermodynamischen Eigenschaften von Wasser und Wasserdampf bei verschiedenen Drücken. Sobald jedoch die zu berechnenden Zustände des Wassers den kritischen Punkt überschreiten, versagt die Berechnung der thermodynamischen Eigenschaften. Eigentlich überrascht dies, da überkritisches Wasser ein einfacher zu berechnendes System darstellt als normales Wasser. Im überkritischen Bereich tritt kein Phasenübergang und auch keine Zweiphasenströmung auf. Einer der Gründe für die Nichtberücksichtigung überkritischer Zustände von Wasser scheint die bislang niedrige Genauigkeit der thermodynamischen Flüssigkeitseigenschaften im Übergangsbereich, der sog. pseudokritischen Zone, zu sein. Die Eigenschaften überkritischer Fluide ändern sich insbesondere kurz vor Erreichen der überkritischen Region nicht monoton und liegen nur tabelliert vor. In diesem Beitrag wird eine Methode vorgestellt, mit der die thermodynamischen Eigenschaften von Wasser im pseudokritischen Bereich mit höherer Genauigkeit in thermohydraulische Programmsysteme implementiert werden können.
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© 2012, Carl Hanser Verlag, München
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Articles in the same Issue
- Contents/Inhalt
- Contents
- Summaries/Kurzfassungen
- Summaries
- Technical Contributions/Fachbeiträge
- Analytical assessment for stress corrosion fatigue of CANDU fuel elements under load following conditions
- Development of a thermal-hydraulic analysis code for annular fuel assemblies
- Reduction of fluid property errors of various thermohydraulic codes for supercritical water systems
- Computational fluid dynamics validation study of steam condensation on the containment walls
- CFD analysis of a hydraulic valve for cavitating flow
- Thermal plume behaviour in the Kadra reservoir at Kaiga atomic power station – Part 2: studies for the case of four and six units in operation
- 124I production for PET imaging at a cyclotron
- Investigation of ground state features of some medical radionuclides
- Solution of the radiative transfer equation with the successive order scattering transport approximation and its application to a biological medium
- Solving the constant source problem for the quadratic anisotropic scattering kernel using the modified FN method
- Application of the Laplace transform method for computational modelling of radioactive decay series
- A standing wave reactor by continuous radial fuel shuffling
- Technical Notes/Technische Mitteilungen
- On the radial flux shape of a fast standing wave reactor operated by radial fuel shuffling
