Published 12 issues per year
ISSN Print: 1044-5110
ISSN Online: 1936-2684
Indexed in
NUMERICAL STUDY OF SUBMERGED CAVITATING THROTTLE FLOWS
ABSTRACT
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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Trummler Theresa, Schmidt Steffen J., Adams Nikolaus A., Investigation of condensation shocks and re-entrant jet dynamics in a cavitating nozzle flow by Large-Eddy Simulation, International Journal of Multiphase Flow, 125, 2020. Crossref
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Bontitsopoulos Stavros, Hamzehloo Arash, Aleiferis Pavlos, Cracknell Roger, Numerical Simulations of the Effect of Cold Fuel Temperature on In-Nozzle Flow and Cavitation Using a Model Injector Geometry, SAE Technical Paper Series, 1, 2020. Crossref
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Falsafi Sherwin, Blume Martin, Klaua Thomas, Indrich Maximilian, Wloka Johann, Skoda Romuald, Numerical simulation of cavitating flow in maritime high-pressure direct fuel injection nozzles and assessment of cavitation-erosion damage, International Journal of Engine Research, 2021. Crossref
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Trummler Theresa, Schmidt Steffen J., Adams Nikolaus A., Numerical prediction of erosion due to a cavitating jet, Wear, 498-499, 2022. Crossref