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Atomization and Sprays
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ISSN Druckformat: 1044-5110
ISSN Online: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2017020387
pages 723-739

NUMERICAL STUDY OF SUBMERGED CAVITATING THROTTLE FLOWS

Bruno Beban
Technical University of Munich, Department of Mechanical Engineering, Chair of Aerodynamics and Fluid Mechanics, Germany
S. J. Schmidt
Chair of Aerodynamics and Fluid Mechanics, Department of Mechanical Engineering, Technical University of Munich, 85748 Garching bei München, Germany
N. A. Adams
Technical University of Munich, Department of Mechanical Engineering, Chair of Aerodynamics and Fluid Mechanics, Germany

ABSTRAKT

We investigate by numerical simulation a highly unsteady cavitating flow of ISO 4113 test fuel in the valve chamber of a Diesel common rail injection system. Two-phase modeling is based on a single-fluid approach and a homogeneous mixture model. A fully compressible flow solver, taking into account the compressibility of liquid and liquid–vapor mixture, is employed. Computational results for two similar designs are presented. We discuss the cavity dynamics and reverse flow development in the discharge throttles for a pressure drop of approximately 2000 bar and choked flow conditions. The focus of this study is placed on inertia-driven effects and formation of collapse-induced pressure peaks, which allows us to apply an inviscid flow model. Our contribution assesses the erosion risk by monitoring maximum instantaneous wall pressures and employing a collapse detector algorithm for the identification of implosions of isolated vapor clouds. High-speed liquid jet discharging from the throttle, accompanied by supercavitation and reverse motion in the throttle, is predicted by the numerical simulation. Collapse pressures higher than 1 GPa are observed near material surfaces, resulting in high surface loads which can eventually lead to material erosion.


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