CFD analysis of a hydraulic valve for cavitating flow
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A. Dutta
Abstract
A successful design of high pressure hydraulic valves requires a thorough analysis of both velocity and pressure fields, with the aim of improving the geometry to avoid cavitation. Cavitation behavior prediction of hydraulic valves and its associated performance drop is of high interest for the manufacturers and for the users. The paper presents a CFD analysis of the flow inside a high pressure hydraulic valve. First, the analysis was carried out without using cavitation model (single phase). It was observed that absolute pressure was going below the vapor pressure. Hence, it was required to turn on the cavitation model. This model enables formation of vapor from liquid when the pressure drops below the vaporization pressure. Since the cavitation bubble grows in a liquid at low temperature, the latent heat of evaporation can be neglected and the system can be considered isothermal. Under these conditions the pressure inside the bubble remains practically constant and the growth of the bubble radius can be approximated by the simplified Rayleigh equation. For typical poppet valve geometry, ½ of computational domain is assumed, with pressure inlet and outlet boundary conditions, and a steady flow solution is computed. Because of the highly complex geometry of the hydraulic valve, the computational domain was meshed using unstructured grids using tetrahedral cells only. The paper presents a numerical investigation of the flow inside a hydraulic valve using commercial CFD code CFD-ACE. The aim of the study is to provide a good basis for future designing of the hydraulic valve. The result indicated the cavitation zones which in turn suggest needs of modification of present geometry.
Kurzfassung
Ein erfolgreiche Anordnung eines Hochdruckhydraulikventils erfordert eine sorgfältige Analyse der Geschwindigkeits- und Druckfelder mit dem Ziel, die Geometrie zu verbessern um so Kavitationen zu verhindern. Die Vorhersage des Kavitationsverhaltens hydraulischen Ventile und der damit verbundene Leistungsabfall ist von großem Interesse für Hersteller und Nutzer. Der vorliegende Beitrag stellt eine CDF Analyse einer Strömung innerhalb eines Hochdruckhydraulikventils vor. Zuerst wurde die Analyse ohne Anwendung eines Kavitationsmodells (einphasig) durchgeführt. Dabei wurde beobachtet, dass der absolute Druck unter dem Dampfdruck lag. Es war deshalb nötig, das Kavitationsmodell anzuwenden. Dieses Modell erlaubt die Bildung von Dampf aus der Flüssigkeit, wenn der Druck unter den Dampfdruck abfällt. Da die Kavitationsblasen in einer Flüssigkeit bei niedrigen Temperaturen wachsen, kann die latente Verdampfungswärme vernachlässigt werden und das System kann als isotherm betrachtet werden. Unter diesen Bedingungen bleibt der Druck im Innern der Blase praktisch konstant und der wachsende Blasenradius kann näherungsweise durch die vereinfachte Rayleigh Gleichung beschrieben werden. Für ein typisches Tellerventil wird die Hälfte des Modellbereichs angenommen, mit Randbedingungen für Eingangsdruck und Ausgangsdruck, und eine Lösung für stationäre Strömung wird berechnet. Wegen der hohen Komplexität des Hydraulikventils wurde für den Modellbereich ein unstrukturiertes Gitternetz mit tetrahedralen Elementen generiert. Der Beitrag beschreibt die numerische Untersuchung der Strömung innerhalb eines Hydraulikventils mit Hilfe des kommerziellen CFD Codes CFD-ACE. Ziel der Studie ist es, eine gute Grundlage für die zukünftige Auslegung eines Hydraulikventils zu schaffen. Die Ergebnisse zeigen, dass die derzeitige Geometrie modifiziert werden sollte.
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© 2012, Carl Hanser Verlag, München
Artikel in diesem Heft
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Artikel in diesem Heft
- 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
