Naphtha vs. dieseline – The effect of fuel properties on combustion homogeneity in transition from CI combustion towards HCCI

Vallinayagam, R.; An, Yanzhao; Vedharaj, S.; Sim, Jaeheon; Chang, Junseok; Johansson, Bengt

doi:10.1016/j.fuel.2018.03.123

Cited by 44 publications

(17 citation statements)

References 42 publications

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“…Neat naphtha had the earliest MFB 50% and MFB 90% at low and medium loads. Although naphtha's low CN increased the ID, it burned rapidly due to improved premixed combustion [34]. At low load (3.2 bar BMEP), the latest MFB 5% was measured for naphtha20 (7.5 • CA ATDC); the latest MFB 10% was for kerosene (8.1 • CA ATDC).…”

Section: Mass Fraction Burned (Mfb)mentioning

confidence: 99%

Combustion Studies of a Non-Road Diesel Engine with Several Alternative Liquid Fuels

et al. 2019

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Sustainable liquid fuels will be needed for decades to fulfil the world’s growing energy demands. Combustion systems must be able to operate with a variety of renewable and sustainable fuels. This study focused on how the use of various alternative fuels affects combustion, especially in-cylinder combustion. The study investigated light fuel oil (LFO) and six alternative liquid fuels in a high-speed, compression-ignition (CI) engine to understand their combustion properties. The fuels were LFO (baseline), marine gas oil (MGO), kerosene, rapeseed methyl ester (RME), renewable diesel (HVO), renewable wood-based naphtha and its blend with LFO. The heat release rate (HRR), mass fraction burned (MFB) and combustion duration (CD) were determined at an intermediate speed at three loads. The combustion parameters seemed to be very similar with all studied fuels. The HRR curve was slightly delayed with RME at the highest load. The combustion duration of neat naphtha decreased compared to LFO as the engine load was reduced. The MFB values of 50% and 90% occurred earlier with neat renewable naphtha than with other fuels. It was concluded that with the exception of renewable naphtha, all investigated alternative fuels can be used in the non-road engine without modifications.

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Section: Mass Fraction Burned (Mfb)mentioning

confidence: 99%

Combustion Studies of a Non-Road Diesel Engine with Several Alternative Liquid Fuels

et al. 2019

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“…For the combination of different fuel types and combustion modes, Vallinayagam et al 14 compared the combustion and emission characteristics of naphtha and diesel/gasoline blends in different combustion modes. They found that for dieseline fuel to obtain the same combustion phase as naphtha, HCCI mode required higher intake temperature, and CI mode required lower intake temperature.…”

Section: Introductionmentioning

confidence: 99%

Effect of gasoline additive on combustion and emission characteristics of an n-butanol Partially Premixed Compression Ignition engine under different parameters

Liu

Zhang

et al. 2021

Sci Rep

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The experiments were conducted on a modified two-cylinder diesel engine to investigate the effects of excess-air coefficient (λ) and intake temperature (Tin) of different blending ratios (volume ratio of gasoline in the blends) on the combustion and emission characteristics of a Partially Premixed Compression Ignition (PPCI) engine. The results show that with the increase of gasoline blending ratio, the peak in-cylinder pressure (Pmax), the peak in-cylinder temperature (Tmax) and the peak heat release rate (HRRmax) of four test fuels all increase first and then decrease. When gasoline volume fraction is 10%, HC and CO emissions are the lowest. In addition, intake temperature (Tin) has a significant effect on the n-butanol/gasoline PPCI engine. With the increase of Tin, the in-cylinder Pmax and HRRmax of four test fuels gradually increase, the combustion phase advances and HC and CO emissions decrease, while NOx emissions increase slightly. Furthermore, as λ increases, the Pmax, Tmax and HRRmax of the four test fuels show monotonously reducing trend. At the same time, mixture concentration has basically no effect on start of combustion (CA10), the combustion duration (CD) gradually extends, and HC and CO emissions increase.

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“…They observed that the optimum RON range was between 75 and 85 in the conditions studied. Recently, PPC operated with low-octane fuel like dieseline (a mixture of the diesel and gasoline) and naphtha at low load condition gained more attention due to the improvement of the combustion stability and engine efficiency [15,16]. PPC adopts early fuel injection strategy that produces longer fuel spray penetration length due to the relatively lower in-cylinder pressure and temperature at the time of injection [17].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effects of Spray–Wall Interaction on Partially Premixed Combustion and Engine Emissions

et al. 2019

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We investigated the detailed spray-wall interaction in partially premixed combustion (PPC) in an optical engine with a wide-angle injector at low engine load. The fuel-trapping effect of the piston topland crevice was visualized by fuel-tracer planar laser-induced fluorescence (PLIF) for the first time. In agreement with the fuel distribution shown by PLIF, the combustion region first moves into the squish region and then tends to move back to the piston bowl when advancing the injection timings. Results indicate that a considerable portion of the fuel is trapped in the piston top-land crevice for the cases with injection timings at -30° (SOI-30 case) and -40° (SOI-40 case) CA aTDC. The SOI-40 case with earlier injection timing presents a backflow process of the trapped fuel from the piston top land crevice to the squish region. However, there is not enough time for the fuel vapor to flow back before the start of combustion for the SOI-30 case, resulting in a relatively lower fuel-air equivalence ratio in the squish region and thus higher CO emission than the SOI-40 case. This study provides insights into the fuel distribution characteristics in piston crevice and the potential effects on the engine emissions under PPC condition.

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Naphtha vs. dieseline – The effect of fuel properties on combustion homogeneity in transition from CI combustion towards HCCI

Cited by 44 publications

References 42 publications

Combustion Studies of a Non-Road Diesel Engine with Several Alternative Liquid Fuels

Combustion Studies of a Non-Road Diesel Engine with Several Alternative Liquid Fuels

Effect of gasoline additive on combustion and emission characteristics of an n-butanol Partially Premixed Compression Ignition engine under different parameters

Experimental Study on the Effects of Spray–Wall Interaction on Partially Premixed Combustion and Engine Emissions

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