Modeling the Effect of Engine Speed on the Combustion Process and Emissions in a DI Diesel Engine

Uludogan, A.; Foster, David E.; Reitz, Rolf D.

doi:10.4271/962056

Cited by 47 publications

(19 citation statements)

References 8 publications

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“…[20] for methane/air flames. The present analysis is consistent with experimental evidence on NO emission in practical devices, such as, for example, the dependence of NO emission on rotational speed for an internal combustion engine [21].…”

Section: Resultssupporting

confidence: 89%

Nitric oxide formation during flame/vortex interaction

Santoro

Kyritsis

Smooke

et al. 2002

Proceedings of the Combustion Institute

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The formation of nitric oxide was investigated in methane diffusion flames under the perturbation of laminar vortices. Laser-induced fluorescence and Raman spectroscopy were used to measure nitric oxide, major species, and temperature, and to obtain the time evolution of the scalar dissipation rate at the stoichiometric surface during the flame/vortex interaction. Vortices with two characteristic times were thrust into the flame and their effects were compared with steady flames at the same scalar dissipation rate. The experimental measurements showed that the vortex did not affect significantly the peak temperature, CO, and CO 2 mass fraction during the interaction. NO, instead, was strongly affected. The peak mass fraction of NO in flames under vortex perturbation differed by almost a factor of 2 from steady flames with similar scalar dissipation rates. One-dimensional numerical simulations, used under the well-justified assumption that the vortices induced negligible curvature, yielded results in good agreement with the experimental measurements. The numerical computations were also used to investigate the effect of the characteristic time of the vortex on the different NO formation paths, that is, thermal, and prompt. The peak mass fraction of thermal NO was shown to be strongly dependent on the timescale of the unsteady perturbation, while prompt NO was almost independent. The emission index, that is, the production of NO normalized by the consumption of the fuel, behaved quasi-steadily for the two formation paths. The results were rationalized by considering the flame structure and the activation energy of the different formation paths.

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Section: Resultssupporting

confidence: 89%

Nitric oxide formation during flame/vortex interaction

Santoro

Kyritsis

Smooke

et al. 2002

Proceedings of the Combustion Institute

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“…Actually, the heat transfer is also different, the faster speed of piston in expansion process shortens the time of heat transfer meanwhile it enhances the flow of mixed gas, which leads to the rise of heat transfer. For all this, Uludogan et al thought that the advantage of rapid mixture is higher than that in heat transfer [13]. Above conclusions illustrate the importance of heat transfer and we will consider using proper model to deal with heat transfer.…”

Section: Simplified Rohr Model Of Hfpdementioning

confidence: 84%

Combustion characteristics analysis of hydraulic free piston diesel engine

Zhang

Zhao

et al. 2015

Applied Energy

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“…The wave breakup model is applied for diesel fuel spray simulation [46]. A Spray wall interaction model 'walljet1' is used for the simulation of non -evaporated fuel particles those striking on the wall of the combustion chamber [47]. The extended zeldovich mechanism is used to calculate the NO emissions and this model can be simulated with the ECFM-3Z combustion model based on equilibrium approach [48].…”

Section: Computational Models and Validationmentioning

confidence: 99%