Auto-ignition quality of Diesel-like fuels in HCCI engines

Risberg, Per; Kalghatgi, Gautam; Ångström, Hans-Erik; Wåhlin, Fredrik

doi:10.4271/2005-01-2127

Cited by 88 publications

(36 citation statements)

References 9 publications

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“…A significant number of experiments and simulations aimed at improving the understanding of the auto-ignition process have been carried out [16][17][18]. These earlier experiments were done with either a constant volume chamber, shock tube or rapid compression machine (RCM).…”

Section: Introductionmentioning

confidence: 99%

Investigation of Auto-Ignition of Octane-CNG Mixture in Hcci Engine

Aziz¹

2015

Int. J. Automot. Mech. Eng.

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Homogeneous Charge Combustion Ignition (HCCI) operating principles have been widely investigated, yet the uncontrollable combustion of HCCI is the major obstacle in its development. The combustion characteristics of single fuels have been widely investigated as the fuel is the most influential factor that determines the HCCI combustion behavior. However, investigations of auto-ignition behavior for multiple fuels have not been carried out. This paper investigates various fuel compositions of Octane and compressed natural gas (CNG), ranging from 10-100% Octane/CNG. The investigation was done in a constant volume chamber with an 820 C cartridge heater. Three lambdas were tested for each fuel mixture, namely 0.8, 1, and 1.2. From the results, it was found that the mixture composition has a major effect on the output of the combustion of dual fuel and a 20 ms injection gap shows better combustion results due to the higher percentage of Octane in the hotter regions, as well as the more homogeneous mixture created. On the other hand, the lambda is a significant parameter that affects the ignition delay, along with the temperature and droplet size of the mixture,

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Section: Introductionmentioning

confidence: 99%

Investigation of Auto-Ignition of Octane-CNG Mixture in Hcci Engine

Aziz¹

2015

Int. J. Automot. Mech. Eng.

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“…The research of Kalghatgi and co-workers [14][15][16] emphasizes the performance and emissions benefits of partially premixed LTC strategies. The ALPING combustion process is a partially premixed LTC concept realized with a specific combination of two fuels: an easily ignitable fuel (e.g.…”

Section: Advanced-injection Low-pilot-ignited Natural-gas Combustionmentioning

confidence: 99%

“…Kalghatgi and co-workers [14][15][16] achieved controlled LTC at relatively high loads (indicated mean effective pressure (IMEP), approximately 15 bar) by resorting to partially premixed combustion with gasoline. They demonstrated that late injection of gasoline yielded low NO x and PM emissions by increasing ignition delays substantially compared with diesel fuels.…”

Section: Introductionmentioning

confidence: 99%

“…These include, among others, homogeneous charge compression ignition (HCCI) [11], early-injection LTC (e.g. the UNIBUS concept [12]), late-injection LTC with aggressive exhaust gas recirculation (EGR) and swirl ratios [13], and partially premixed LTC [14][15][16] with low-cetane fuels. Combustion control issues with HCCI limit the maximum attainable BMEPs.…”

Section: Introductionmentioning

confidence: 99%

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Multi-zone modelling of partially premixed low-temperature combustion in pilot-ignited natural-gas engines

Krishnan

Srinivasan

2010

Proceedings of the Institution of Mechanical Engineers, Part D:

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Detailed results from a multi-zone phenomenological simulation of partially premixed advanced-injection low-pilot-ignited natural-gas low-temperature combustion are presented with a focus on early injection timings (the beginning of (pilot) injection (BOI)) and very small diesel quantities (2-3 per cent of total fuel energy). Combining several aspects of diesel and spark ignition engine combustion models, the closed-cycle simulation accounted for diesel autoignition, diesel spray combustion, and natural-gas combustion by premixed turbulent flame propagation. The cylinder contents were divided into an unburned zone, several pilot fuel zones (or 'packets') that modelled diesel evaporation and ignition, a flame zone for natural-gas combustion, and a burned zone. The simulation predicted the onset of ignition, cylinder pressures, and heat release rate profiles satisfactorily over a wide range of BOIs (20-60u before top dead centre (before TDC)) but especially well at early BOIs. Strong coupling was observed between pilot spray combustion in the packets and premixed turbulent combustion in the flame zone and, therefore, the number of ignition centres (packets) profoundly affected flame combustion. The highest local peak temperatures (greater than 2000 K) were observed in the packets, while the flame zone was much cooler (about 1650 K), indicating that pilot diesel spray combustion is probably the dominant source of engine-out emissions of nitrogen oxide (NO x ). Further, the 60u before TDC BOI yielded the lowest average peak packet temperatures (about 1720 K) compared with the 20u before TDC BOI (about 2480 K) and 40u before TDC BOI (about 2700 K). These trends support experimental NO x trends, which showed the lowest NO x emissions for the 60u, 20u, and 40u before TDC BOIs in that order. Parametric studies showed that increasing the intake charge temperature, pilot quantity, and natural-gas equivalence ratio all led to higher peak heat release rates and hotter packets but the pilot quantity and intake temperature affected the potential for NO x formation to a greater extent.

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“…Risberg et al [9] correlated CN with CA50 (the crank angle cycle where 50 per cent of the total heat is released) for mixtures of n-heptane, iso-octane, and toluene. Aroonsrisopon et al [10] investigated fuels with identical research octane numbers but different fuel chemistries.…”

Section: Introductionmentioning

confidence: 99%

Effects of different cetane number enhancement strategies on HCCI combustion and emissions

Hosseini

Neill

Guo

et al. 2011

International Journal of Engine Research

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Effects of different cetane number enhancement strategies on HCCI combustion and emissionsThe manuscript was received on 5 January 2010 and was accepted after revision for publication on 7 December 2010. DOI: 10.1177/1468087410395873Abstract: Cetane number is the accepted indicator for quantifying the autoignition characteristics of diesel fuels in compression ignition engines. Diesel fuel specifications typically require a minimum cetane number to achieve satisfactory combustion behaviour in conventional diesel engines. In contrast, a high cetane number fuel may not be beneficial for implementing high efficiency, clean combustion strategies such as homogeneous charge compression ignition (HCCI). The purpose of this study was to investigate cetane number effects on HCCI combustion and emissions. The experiments were conducted in a single-cylinder, variable compression ratio, cooperative fuel research engine operated in HCCI combustion mode. The fuels were finely atomized and partially vaporized in the intake manifold. The base fuel was a low cetane refining stream derived from oil sands sources. Three different methods were employed to increase the base fuel cetane number, namely hydroprocessing, cetane improver addition, and blending with a renewable fuel component. Results show that the three methods of cetane number enhancement produce significantly different HCCI combustion behaviour. The hydroprocessed fuels exhibited more stable and complete combustion than the base fuel, which resulted in a wider operating region, reduced carbon monoxide, unburned hydrocarbon, and nitrogen oxide (NO x ) emissions, and lower indicated specific fuel consumption (ISFC). The main disadvantages of the hydroprocessed fuels were the higher exhaust gas recirculation rates required to retard the combustion phasing, which limits the maximum indicated mean effective pressure for a given intake pressure, and increased knock intensity due to a faster combustion process. In comparison, the other two methods of fuel cetane enhancement increased ISFC compared to the base fuel. The addition of nitrate cetane improver resulted in higher NO x emissions, while blending with a renewable fuel component increased hydrocarbon emissions. The experimental data provide evidence that the magnitude and phasing of low temperature heat release, as well as fuel volatility, play important roles in HCCI combustion.

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Auto-ignition quality of Diesel-like fuels in HCCI engines

Cited by 88 publications

References 9 publications

Investigation of Auto-Ignition of Octane-CNG Mixture in Hcci Engine

Investigation of Auto-Ignition of Octane-CNG Mixture in Hcci Engine

Multi-zone modelling of partially premixed low-temperature combustion in pilot-ignited natural-gas engines

Effects of different cetane number enhancement strategies on HCCI combustion and emissions

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