Modeling Diesel Engine NOx and Soot Reduction with Optimized Two-Stage Combustion

Sun, Yong; Reitz, Rolf D.

doi:10.4271/2006-01-0027

Cited by 90 publications

(34 citation statements)

References 17 publications

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“…7 (a) Fuel-air mixture inhomogeneity at 30 per cent of the total heat release and (b) its effect on the ignition delay. The ignition delay is the time interval from the start of injection to the crank angle at 30 per cent of total heat release figure, the inhomogeneity is defined as the normalized standard deviation of the local equivalence ratio for each computational cell, considering the local mass distributions as a weighting factor [22]. As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Improvements in the performance and pollutant emissions for stoichiometric diesel combustion engines using a two-spray-angle nozzle

Kim

Reitz

Park

2010

Proceedings of the Institution of Mechanical Engineers, Part D:

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An experimental and numerical study was conducted to investigate the effect of the nozzle layout on the combustion and emission characteristics for stoichiometric diesel combustion. In order to improve fuel-air mixing, a new concept of nozzle layout was studied. The nozzle has two spray angles, one heading for the bowl and the other targeting the squish area (two-spray-angle nozzle (2SAN)). The spray included angles of the nozzle layout are 150u (upper holes) and 70u (lower holes), and the start-of-injection timings were swept from 233u to 29u after top dead centre. The results of the 2SAN were compared with those of a wellcharacterized baseline single-hole nozzle (SHN) with a 130u spray included angle.The experimental results showed that the engine performance and carbon monoxide emissions were reduced significantly by using the 2SAN instead of the SHN with stoichiometric diesel combustion. However, hydrocarbon emissions were increased owing to fuel-film formation. In addition, the range of optimal injection timings for reduced fuel consumption for the 2SAN is wider than that of the SHN because the upper spray of the 2SAN utilizes oxygen in the squish area more efficiently.

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Section: Resultsmentioning

confidence: 99%

Improvements in the performance and pollutant emissions for stoichiometric diesel combustion engines using a two-spray-angle nozzle

Kim

Reitz

Park

2010

Proceedings of the Institution of Mechanical Engineers, Part D:

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show abstract

“…The use of an early small injection (pilot injection) with a large amount injection (main injection) at later crank angle in PPC engines is able to reduce the maximum value of heat release by spreading out the heat release through split injection [12]. In addition, reduction of heat release rate in this strategy is suitable for higher engine load conditions.…”

Section: Introductionmentioning

confidence: 96%

Decreasing the emissions of a partially premixed gasoline fueled compression ignition engine by means of injection characteristics and EGR

Nemati¹,

Barzegar²,

Khalil³

et al. 2011

THERM SCI

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This paper is presented in order to elucidate some numerical investigations related to a partially premixed gasoline fuelled engine by means of three dimensional CFD code. Comparing with the diesel fuel, gasoline has lower soot emission because of its higher ignition delay. The application of double injection strategy reduces the maximum heat release rate and leads to the reduction of NOx emission. For validation of the model, the results for the mean in-cylinder pressure, H.R.R., NOx and soot emissions are compared with the corresponding experimental data and show good levels of agreement. The effects of injection characteristics such as, injection duration, spray angle, nozzle hole diameter, injected fuel temperature and EGR rate on combustion process and emission formation are investigated yielding the determination of the optimal point thereafter. The results indicated that optimization of injection characteristics leads to simultaneous reduction of NOx and soot emissions with negligible change in IMEP

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“…One approach to reduce the emissions in a diesel engine is PCCI which has been studied over the past years by many researchers using engine experiments [59][60][61][62][63][64][65][66][67] and simulation studies [68][69][70][71]. The basic idea of PCCI is to enhance mixing and evaporation by an early fuel injection in the compression cycle before TDC.…”

Section: Low Temperature Combustionmentioning

confidence: 99%

Investigation of Cluster-Nozzle Concepts for Direct Injection Diesel Engines

Won

Peters

2009

Atomiz Spr

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Modeling Diesel Engine NOx and Soot Reduction with Optimized Two-Stage Combustion

Cited by 90 publications

References 17 publications

Improvements in the performance and pollutant emissions for stoichiometric diesel combustion engines using a two-spray-angle nozzle

Improvements in the performance and pollutant emissions for stoichiometric diesel combustion engines using a two-spray-angle nozzle

Decreasing the emissions of a partially premixed gasoline fueled compression ignition engine by means of injection characteristics and EGR

Investigation of Cluster-Nozzle Concepts for Direct Injection Diesel Engines

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