Numerical Study on the Multiple Injection Strategy in Diesel Engines using a Modified 2-D Flamelet Model

Kim, Gyujin; Min, Kyoungdoug

doi:10.4271/2015-24-2406

Cited by 2 publications

(1 citation statement)

References 34 publications

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“…Thermal boundary conditions for head, piston, and liner were fixed 430 K, 440 K, and 420 K respectively. The more details of the CFD simulation can be found in [36].…”

Section: Determination Of the Adiabatic Flame Temperaturementioning

confidence: 99%

Development of a Real-Time Virtual Nitric Oxide Sensor for Light-Duty Diesel Engines

Lee

Kim

et al. 2017

Energies

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This study describes the development of a semi-physical, real-time nitric oxide (NO) prediction model that is capable of cycle-by-cycle prediction in a light-duty diesel engine. The model utilizes the measured in-cylinder pressure and information obtained from the engine control unit (ECU). From the inputs, the model takes into account the pilot injection burning and mixing, which affects the in-cylinder mixture formation. The representative in-cylinder temperature for NO formation was determined from the mixture composition calculation. The selected temperature and mixture composition was substituted using a simplified form of the NO formation rate equation for the cycle-by-cycle estimation. The reactive area and the duration of NO formation were assumed to be limited by the fuel quantity. The model predictability was verified not only using various steady-state conditions, including the variation of the EGR rate, the boost pressure, the rail pressure, and the injection timing, but also using transient conditions, which represent the worldwide harmonized light vehicles test procedure (WLTC). The WLTC NO prediction results produced less than 3% error with the measured value. In addition, the proposed model maintained its reliability in terms of hardware aging, the changing and artificial perturbations during steady-state and transient engine operations. The model has been shown to require low computational effort because of the cycle-by-cycle, engine-out NO emission prediction and control were performed simultaneously in an embedded system for the automotive application. We expect that the developed NO prediction model can be helpful in emission calibration during the engine design stage or in the real-time controlling of the exhaust NO emission for improving fuel consumption while satisfying NO emission legislation.

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“…Thermal boundary conditions for head, piston, and liner were fixed 430 K, 440 K, and 420 K respectively. The more details of the CFD simulation can be found in [36].…”

Section: Determination Of the Adiabatic Flame Temperaturementioning

confidence: 99%

Development of a Real-Time Virtual Nitric Oxide Sensor for Light-Duty Diesel Engines

Lee

Kim

et al. 2017

Energies

Self Cite

View full text Add to dashboard Cite

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Numerical Analysis of the Combustion and Emission Characteristics of Diesel Engines with Multiple Injection Strategies Using a Modified 2-D Flamelet Model

et al. 2017

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Abstract:The multiple injection strategy has been widely used in diesel engines to reduce engine noise, NO x and soot formation. Fuel injection developments such as the common-rail and piezo-actuator system provide more precise control of the injection quantity and time under higher injection pressures. As various injection strategies become accessible, it is important to understand the interaction of each fuel stream and following combustion process under the multiple injection strategy. To investigate these complex processes quantitatively, numerical analysis using CFD is a good alternative to overcome the limitation of experiments. A modified 2-D flamelet model is further developed from previous work to model multi-fuel streams with higher accuracy. The model was validated under various engine operating conditions and captures the combustion and emissions characteristics as well as several parametric variations. The model is expected to be used to suggest advanced injection strategies in engine development processes.

show abstract

Numerical Study on the Multiple Injection Strategy in Diesel Engines using a Modified 2-D Flamelet Model

Cited by 2 publications

References 34 publications

Development of a Real-Time Virtual Nitric Oxide Sensor for Light-Duty Diesel Engines

Development of a Real-Time Virtual Nitric Oxide Sensor for Light-Duty Diesel Engines

Numerical Analysis of the Combustion and Emission Characteristics of Diesel Engines with Multiple Injection Strategies Using a Modified 2-D Flamelet Model

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