Investigation into Partially Premixed Combustion in a Light-Duty Multi-Cylinder Diesel Engine Fuelled with a Mixture of Gasoline and Diesel

Weall, Adam; Collings, Nick

doi:10.4271/2007-01-4058

Cited by 101 publications

(43 citation statements)

References 10 publications

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“…Furthermore, new combustion concepts, i.e. multiple stage diesel combustion (MULDIC) (Hashizume et al, 1998), late fuel injection strategies (Kimura et al, 2001), premixed diesel combustion (PREDIC) (Klingbeil et al, 2003), homogeneous charge compression ignition (HCCI) (Ibara et al, 2006), and partially premixed compression ignition engines (PPCI) (Weall & Collings, 2007) have been tested and some of them are in markets today. Auxiliary emission control devices makes possible an optimisation between fuel consumption (in term of thermal efficiency) and NO x -PM trade-off emissions, thank to the advent of new control technologies.…”

Section: Emission Regulation and Controlsmentioning

confidence: 99%

The Use of Biodiesel in Diesel Engines

Chuepeng¹

2011

Biodiesel- Quality, Emissions and by-Products

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Section: Emission Regulation and Controlsmentioning

confidence: 99%

The Use of Biodiesel in Diesel Engines

Chuepeng¹

2011

Biodiesel- Quality, Emissions and by-Products

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“…Combustion becomes homogenous with advanced SOI and increased dilution levels, whereas increasing the intake air temperature supports auto-ignition. While SOI is a decisive factor that affects combustion phasing, fuel octane number also proves crucial [13,14]. The use of gasoline like fuels in CI engine enables in achieving PPC or HCCI and reduces the emissions [15].…”

Section: Combustion Stratification For Naphtha From CI Combustion To Ppcmentioning

confidence: 99%

Combustion Stratification for Naphtha from CI Combustion to PPC

Vallinayagam

Vedharaj

et al. 2017

SAE Technical Paper Series

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This study demonstrates the combustion stratification from conventional compression ignition (CI) combustion to partially premixed combustion (PPC). Experiments are performed in an optical CI engine at a speed of 1200 rpm for diesel and naphtha (RON = 46). The motored pressure at TDC is maintained at 35 bar and fuelMEP is kept constant at 5.1 bar to account for the difference in fuel properties between naphtha and diesel. Single injection strategy is employed and the fuel is injected at a pressure of 800 bar. Photron FASTCAM SA4 that captures in-cylinder combustion at the rate of 10000 frames per second is employed. The captured high speed video is processed to study the combustion homogeneity based on an algorithm reported in previous studies.Starting from late fuel injection timings, combustion stratification is investigated by advancing the fuel injection timings. For late start of injection (SOI), a direct link between SOI and combustion phasing is noticed. At early SOI, combustion phasing depends on both intake air temperature and SOI. In order to match the combustion phasing (CA50) of diesel, the intake air temperature is increased to 90°C for naphtha. The combustion stratification from CI to PPC is also investigated for various level of dilution by displacing oxygen with nitrogen in the intake. The start of combustion (SOC) was delayed with the increase in dilution and to compensate for this, the intake air temperature is increased. The mixture homogeneity is enhanced for higher dilution due to longer ignition delay. The results show that high speed image is initially blue and then turned yellow, indicating soot formation and oxidation. The luminosity of combustion images decreases with early SOI and increased dilution. The images are processed to generate the level of stratification based on the image intensity. The level of stratification is same for diesel and naphtha at various SOI. When O 2 concentration in the intake is decreased to 17.7% and 14.7%, stratification level is decreased. NO X emission for both diesel and naphtha show a decreasing trend from CI to PPC.Comparing diesel and naphtha, the soot emission is lower for naphtha. NO X and soot emissions at various SOI are correlated with high speed images of combustion to explain the combustion stratification.

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“…Therefore, there is a necessity to examine the CN effects in the premixed LTC mode of diesel engines. Further, while commercial fuels for current diesel engines have CNs ranging from 40 to 57, it is quite possible that fuels of lower ignitability will be considered for use in diesel engines to meet the requirements of higher thermal efficiencies, fuel diversification, and lower production cost for refineries in the future, like has been reported in references [1][2][3][4]. To elucidate this, more extensive investigations of the effects of fuel ignitability over a wider range on diesel engines operated in a wide range of combustion modes would be essential.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, recent research has shown that gasoline can be simply converted to work in diesel engines with higher efficiency than in spark ignition engines [1][2][3][4]. However, due to the trade-off between soot and nitrogen oxides (NOx) from jet-mixing-controlled diesel combustion [5], it appears unlikely that conventional diesel engines can meet the increasingly stringent emission regulations coming into force in most industrialized countries without fairly expensive after-treatment systems [6][7], despite the significant reductions of engine-out emissions with advanced technologies including elevated injection pressure, sophistically-controlled injection strategy, cooled exhaust gas recirculation (EGR), and variable-geometry turbochargers.…”

Section: Introductionmentioning

confidence: 99%

Dependence of premixed low-temperature diesel combustion on fuel ignitability and volatility

Moriwaki

Ogawa

et al. 2011

International Journal of Engine Research

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Abstract:A comprehensive study of fuel property effects in internal combustion engines is required to enable fuel diversification as well as applications to advanced engines being developed for operation with a variety of combustion modes. The objective of this paper is to investigate the effects of fuel ignitability and volatility over a wide range on premixed low-temperature combustion (LTC) modes in diesel engines. Twenty three fuels were prepared from commercial gasoline, kerosene, and diesel as baseline fuels and with the addition of additives, to generate a cetane number (CN) range from 11 to 75. Experiments with a single cylinder diesel engine operated in moderately-advanced-injection LTC modes were conducted to evaluate these fuels. The combustion phasing is demonstrated to be a good indicator to estimate the in-cylinder peak pressure, exhaust gas emissions, and thermal efficiency in the LTC mode. Fuel ignitability affects the combustion phasing by changing the ignition delay. The predicted cetane number (PCN) based on fuel molecular structure analysis can be fitted to the ignition delays with a higher coefficient of determination than CN, suggesting a good potential as a fuel ignitability measure over a wide range. The stable operating load range in the smokeless LTC mode depends more on the actual ignition delay or PCN rather than CN. With fixed injection timing and intake oxygen concentration, O 2in , only when PCN < 40, the load range can be expanded significantly to higher loads. With holding the combustion phasing at TDC and varying O 2in , the NOx and smoke emissions become limitations of the load expansion for some fuels. The effects of fuel volatility on the characteristics of LTC are small compared to ignitability. Finally, the operational injection timing range and robustness of the LTC to fuel ignitability are examined, showing that the advantageous ignitability range becomes narrower with fuel ignitability decreasing.

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Investigation into Partially Premixed Combustion in a Light-Duty Multi-Cylinder Diesel Engine Fuelled with a Mixture of Gasoline and Diesel

Cited by 101 publications

References 10 publications

The Use of Biodiesel in Diesel Engines

The Use of Biodiesel in Diesel Engines

Combustion Stratification for Naphtha from CI Combustion to PPC

Dependence of premixed low-temperature diesel combustion on fuel ignitability and volatility

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