Emission Characteristics of Premixed Lean Diesel Combustion with Extremely Early Staged Fuel Injection.

Takeda, Yoshinaka; Nakagome, Keiichi; Niimura, Keiichi

doi:10.1299/kikaib.62.2887

Cited by 52 publications

(47 citation statements)

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“…In conventional CI engines, on the other hand, most of the fuel is burned in a diffusion combustion phase, which inherently leads to the formation of excessive amounts of soot and NO x emissions. In HCCI engines, however, NO x and soot emissions may decrease drastically because homogeneous lean mixtures are employed (Takeda et al, 1996;Yanagihara, 1997). Because the onset of HCCI combustion depends on the autoignition of the fuel, it is quite difficult to control the start of combustion directly.…”

Section: Introductionmentioning

confidence: 99%

Photographic Observation and Emission Spectral Analysis of Homogeneous Charge Compression Ignition Combustion

Murase

Hanada

Miyaura

et al. 2005

Combustion Science and Technology

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Experimental studies of homogeneous charge compression ignition (HCCI) combustion have been conducted by using a compact rapid compression machine. The image of the cool flame was captured by a high-speed camera with image intensifier, and during the cool flame appearance the Emeleus cool flame band was observed. Then blue flame became evident, its emission spectrum being similar to that of the cool flame with overlapping by HCO bands. During the main heat release duration, the hot flame emission spectrum was observed, where the distinct OH emission appeared, and it was superimposed on the carbon monoxide oxidation continuum. After the main heat release, the broad peak of the spectrum was shifted to the longer-wavelength side, and the images of the flames changed to red, especially at higher equivalence ratios. This red coloration must originate from the H 2 O vibration-rotation bands (580.7-966.9 nm). On the other hand, it has been revealed that a pulsed flame jet (PFJ) has the potential for directly controlling the start of HCCI combustion. In the jet of PFJ, the emission spectrum obtained was composed of distinct OH and CH emissions superimposed on the carbon monoxide oxidation continuum.

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Section: Introductionmentioning

confidence: 99%

Photographic Observation and Emission Spectral Analysis of Homogeneous Charge Compression Ignition Combustion

Murase

Hanada

Miyaura

et al. 2005

Combustion Science and Technology

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“…Lean-homogeneous mixture at low-load HCCI: The burning of a diesel fuel in an excessively lean and homogeneous cylinder charge mixture (equivalence ratio F < 0.3) results in simultaneous low-NOx and low-soot combustion [24][25][26]. This type of combustion is considered as a representative for low-load homogeneous charge compression ignition (HCCI).…”

Section: Introductionmentioning

confidence: 99%

Implementation of multiple-pulse injection strategies to enhance the homogeneity for simultaneous low-NOx and -soot diesel combustion

Zheng

Kumar

2009

International Journal of Thermal Sciences

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“…Although there have been many investigations related to the HCCI combustion mode in diesel engines (Takeda et al, 1996;Gray and Ryan, 1997;Nakagome and Niimura, 1997;Odaka et al, 1999;Akagawa et al, 1999;Nishijima et al, 2001;Helmantel and Denbratt, 2004;Choi et al, 2004), only a few practical techniques have been implemented in commercial diesel engines. An example is called Modulated Kinetics (MK) combustion (Kimura et al, 1999(Kimura et al, , 2001Lee and Reitz, 2003).…”

Section: Introductionmentioning

confidence: 99%

Low temperature premixed combustion within a small bore high speed direct injection (HSDI) optically accessible diesel engine using a retarded single injection

Fang

Coverdill

Lee

et al. 2008

Int.J Automot. Technol.

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An optically accessible single-cylinder high speed direct-injection (HSDI) Diesel engine equipped with a Bosch common rail injection system was used to study low temperature Modulated Kinetics (MK) combustion with a retarded single main injection. High-speed liquid fuel Mie-scattering was employed to investigate the liquid distribution and evolution. By carefully setting up the optics, three-dimensional images of fuel spray were obtained from both the bottom of the piston and the side window. The NOx emissions were measured in the exhaust pipe. The influence of injection pressure and injection timing on liquid fuel evolution and combustion characteristics was studied under similar fuel quantities. Interesting spray development was seen from the side window images. Liquid impingement was found for all of the cases due to the small diameter of the piston bowl. The liquid fuel tip hits the bowl wall obliquely and spreads as a wall jet in the radial direction of the spray. Due to the bowl geometry, the fuel film moves back into the central part of the bowl, which enhances the airfuel mixing process and prepares a more homogeneous air-fuel mixture. Stronger impingement was seen for high injection pressures. Injection timing had little effect on fuel impingement. No liquid fuel was seen before ignition, indicating premixed combustion for all the cases. High-speed combustion video was taken using the same frame rate. Ignition was seen to occur on or near the bowl wall in the vicinity of the spray tip, with the ignition delay being noticeably longer for lower injection pressure and later injection timing. The majority of the flame was confined to the bowl region throughout the combustion event. A more homogeneous and weaker flame was observed for higher injection pressures and later injection timing. The combustion structure also proves the mixing enhancement effect of the liquid fuel impingement. The results show that ultralow sooting combustion is feasible in an HSDI diesel engine with a higher injection pressure, a higher EGR rate, or later injection timing, with little penalty on power output. It was also found that injection timing has more influence on HCCI-like combustion using a single main injection than the other two factors studied. Compared with the base cases, simultaneous reductions of soot and NOx were obtained by increasing EGR rate and retarding injection timing. By increasing injection pressure, NOx emissions were increased due to leaner and faster combustion with better air-fuel mixing. However, smoke emissions were significantly reduced with increased injection pressure.

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Emission Characteristics of Premixed Lean Diesel Combustion with Extremely Early Staged Fuel Injection.

Cited by 52 publications

References 0 publications

Photographic Observation and Emission Spectral Analysis of Homogeneous Charge Compression Ignition Combustion

Photographic Observation and Emission Spectral Analysis of Homogeneous Charge Compression Ignition Combustion

Implementation of multiple-pulse injection strategies to enhance the homogeneity for simultaneous low-NOx and -soot diesel combustion

Low temperature premixed combustion within a small bore high speed direct injection (HSDI) optically accessible diesel engine using a retarded single injection

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