Journal: SAE Technical Papers

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SAE

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0148-7191
2688-3627

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2000 - 2009122010 - 202025
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Publications 1 - 10 of 37
  • Estimation of the Instantaneous In-Cylinder Pressure for Control Purposes using Crankshaft Angular Velocity
    Item type: Working Paper
    Brand, Daniel; Onder, Christopher H.; Guzzella, Lino (2005)
    SAE Technical Papers
    Instantaneousin-cylinderpressure , a key variable in the improvement of engine performance and reduction of emissions, is not likely to be measured directly in production type engines in the near future. As a countermeasure, a pressureestimation method based on physical first principles fortheestimationoftheinstantaneousin-cylinderpressureof an SI engine using measured crankshaftangularvelocity is presented here. <br/> The approach consists of (a) mapping the model parameters at nominal operating conditions and (b) adapting the model parameters to current operating conditions usingtheinstantaneouscrankshaftangularvelocity . The model reflects all essential effects on in-cylinderpressure , while the simulation time was reduced to 6 milliseconds per cycle on a standard PC. This makes it possible to estimate a cylinder-averaged pressurefor each cycle up to an engine speed of more than 6000 rpm. The estimated in-cylinderpressure is available with a delay of one engine cycle. <br/> The model has been compared to a benchmark pressureestimation method. Further, the model has been validated in simulation and against measured data for steady-state and transient operation. The model shows good accuracy, while the computational effort is promising for real-time applications. Furthermore, the model needs little calibration effort due to its physically based nature.
  • CMC Model Applied to Marine Diesel Spray Combustion: Influence of Fuel Evaporation Terms
    Item type: Conference Paper
    Srna, Aleš; Bolla, Michele; Boulouchos, Konstantinos; et al. (2014)
    SAE Technical Papers
    This study presents an application of the conditional moment closure (CMC) combustion model to marine diesel sprays. In particular, the influence of fuel evaporation terms has been investigated for the CMC modeling framework. This is motivated by the fact that substantial overlap between the dense fuel spray and flame area is encountered for sprays in typical large two-stroke marine diesel engines which employ fuel injectors with orifice diameters of the order of one millimeter. Simulation results are first validated by means of experimental data from the Wärtsilä optically accessible marine spray combustion chamber in terms of non-reactive macroscopic spray development. Subsequently, reactive calculations are carried out and validated in terms of ignition delay time, ignition location, flame lift-off length and temporal evolution of the flame region. Finally, the influence of droplet terms on spray combustion is analyzed in detail. The effect of evaporation into the mixture fraction variance transport equation was seen to play a prominent role concerning autoignition and flame stabilization: both ignition delay and flame lift-off length are considerably increased when evaporation effects are included. This was found to be attributed to the strong spatial overlap between evaporation and combustion - typical for marine sprays - leading to an increase in the local scalar dissipation rate in the evaporating region. Overall, inclusion of evaporation terms resulted in improved agreement with experimental data. These findings are contrary to previous investigations for typical automotive diesel sprays reporting only a minor influence of evaporation. Consequently, this study constitutes an extension of former analyses to large marine fuel injection configurations and emphasizes the importance of such effects for the simulation of marine diesel sprays.
  • Model-based control of the VGT and EGR in a turbocharged common-rail diesel engine: Theory and passenger car implementation
    Item type: Conference Paper
    Ammann, M.; Fekete, Nicholas P.; Guzzella, Lino; et al. (2004)
    SAE Technical Papers
  • Combustion Characteristics of Hydrogen-Natural Gas Mixtures in Passenger Car Engines
    Item type: Conference Paper
    Dimopoulos, P.; Boulouchos, Konstantinos; Rechsteiner, C.; et al. (2007)
    SAE Technical Papers
  • Experimental Validation of a Global Reaction Model for a Range of Gasolines and Kerosenes under HCCI Conditions
    Item type: Conference Paper
    Vandersickel, Annelies; Wright, Yuri; Boulouchos, Konstantinos; et al. (2011)
    SAE Technical Papers
  • Numerical Investigation of Nozzle-Geometry Variations and Back-Pressure Changes on High Pressure Gas Injections under Application-Relevant Conditions
    Item type: Conference Paper
    Banholzer, Matthias; Pfitzner, Michael; Sakellarakis, David; et al. (2018)
    SAE Technical Papers
  • The Effects of Intake Pressure on In-Cylinder Gas Velocities in an Optically Accessible Single-Cylinder Research Engine
    Item type: Conference Paper
    Welch, Cooper; Schmidt, Marius; Keskinen, Karri; et al. (2020)
    SAE Technical Papers
    Conference cancelled due to Corona virus (COVID-19).
  • Experimental and Numerical Investigations on HCCI Combustion
    Item type: Conference Paper
    Barroso, G.; Escher, A.; Boulouchos, Konstantinos (2005)
    SAE Technical Papers ~ Proceedings
  • CFD-Simulation of Ignition and Combustion in Lean Burn Gas Engines
    Item type: Conference Paper
    Xu, Guoqing; Hanauer, Christophe; Wright, Yuri M.; et al. (2016)
    SAE Technical Papers
  • A Zero Dimensional Turbulence and Heat Transfer Phenomenological Model for Pre-Chamber Gas Engines
    Item type: Conference Paper
    Bardis, Konstantinos; Xu, Guoqing; Kyrtatos, Panagiotis; et al. (2018)
    SAE Technical Papers
Publications 1 - 10 of 37