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Pachler, Klaus
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Influence of Inflow Boundary Conditions on High-Pressure Fuel Injection: Assessment Based on LES Approach

SAE International Journal of Engines

AVL List GmbH, Austria-Klaus Pachler, Marco Cristofaro
AVL List GmbH, Austria Friedrich-Alexander University Erlangen-Nürnberg, Germany-Amir Žilić
  • Journal Article
  • 03-13-02-0009
Published 2019-11-19 by SAE International in United States
The Engine Combustion Network case Spray A with a high-pressure fuel injection is at typical operating conditions of Diesel engines. Detailed pieces of information on this experiment are available, which supports a high-fidelity Large Eddy Simulation (LES) with real fluid thermodynamics. An internal injector flow simulation with the needle movement measured during the experiments is used to provide a realistic boundary condition for the fuel spray simulation. Two spray simulations have been conducted: one with a constant velocity profile and one with the velocity distribution obtained from a separate injector internal flow simulation. Peculiar emphasis is placed on the velocity and turbulence distribution to quantify the influence of spray inlet boundary conditions. The fuel injection is modeled with a single-phase approach applying adequate resolution to capture phase boundaries. Observations from simulation results indicate a significant influence of the inlet boundary conditions on fuel distribution and penetration length, turbulent mixing, and enthalpy propagation.
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Modeling the Pilot Injection and the Ignition Process of a Dual Fuel Injector with Experimental Data from a Combustion Chamber Using Detailed Reaction Kinetics

AVL-Peter Priesching, Klaus Pachler
Technische Universität Wien-Jens Frühhaber, Sebastian Schuh, Thomas Lauer, Franz Winter
Published 2018-09-10 by SAE International in United States
The introduction of the so called Emission Controlled Areas within the IMO Tier III legislation forces manufacturers of maritime propulsion systems to adherence to stringent emission thresholds. Dual fuel combustion, which is characterized by the injection of a small amount of fuel oil to ignite a premixed natural gas air mixture, constitutes an option to meet this target. At high diesel substitution rates and very short pilot injection events, the injector is operated in the ballistic regime. This influences spray penetration, mixture formation and ignition behavior. In the present work, a seven-hole dual fuel injector was measured in a combustion chamber to provide data for the generation of a CFD model using the commercial code AVL FIRE®. The liquid and the vapor phase of the fuel spray were quantified by Mie-scattering and Schlieren-imaging technique for different chamber conditions. Based on the measured spray characteristics, a methodology was developed to imprint a velocity profile to the initial droplets in the CFD model, to depict the spray penetration for small injection durations. To characterize the ignition process…
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75 Multidimensional simulation of gasoline direct-injection engines

AVL List GmbH-Reinhard Tatschl, Klaus Pachler, Jürgen Schneider, Ernst Winklhofer
  • Technical Paper
  • 1999-08-0074
Published 1999-05-19 by Society of Automotive Engineers of Japan in Japan
In the development process of gasoline direct-injection engines, advanced diagnostic and CFD simulation techniques are contributing to the optimization of injection and combustion system performance. With regard to the simulation, the gasoline direct-injection engine imposes severe requirements onto the performance of mixture formation and combustion models. Careful validation of the individual modeling aspects of spray formation and propagation, droplet/wall interaction and combustion is required in order to enable the use of CFD as a reliable tool within the engine development process. The present article is aimed at demonstrating the current status in the development of spray and combustion models for application to gasoline direct- injection engines.