Characterization of Mixture Formation in Split-Injection Diesel Sprays via Laser Absorption-Scattering (LAS) Technique

Zhang, Yuyin; Ito, Tomoaki; Nishida, Keiya

doi:10.4271/2001-01-3498

Cited by 39 publications

(25 citation statements)

References 18 publications

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“…Because the physical phenomena involved with multiple injection strategies are complex, multiple studies have been carried out to investigate the mixture formation and the combustion process with optical measurement techniques. Mixture formation with changes of pilot injection mass and dwell is characterized by Zhang et al 6 by analyzing fuel distributions and air-entrainment via laser absorption-scattering techniques. Quantitative concentration information for both fuel vapor and liquid droplets is provided.…”

Section: Introductionmentioning

confidence: 99%

The influence of pilot injection on high-temperature ignition processes and early flame structure in a high-speed direct injection diesel engine

Park

Busch

2017

International Journal of Engine Research

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Simultaneous high-speed natural luminosity and OH* chemiluminescence imaging is used to characterize hightemperature ignition processes in conventional diesel combustion with a pilot-main injection strategy in a single-cylinder, light-duty optical diesel engine. High-speed imaging provides temporally and spatially resolved information in terms of high-temperature ignition processes and flame structure during the combustion. Using these imaging measurements, the high-temperature inflammation and the diffusion flame development processes are analyzed. The chemiluminescence signal shows a hot, reactive mixture, which gradually decreases after the peak release of the pilot combustion and lasts long after the apparent heat release has ended. Therefore, when the reactive pilot mixture exists near the main injection jets, the high-temperature ignition of the main injection is apparently initiated through interactions with the reactive pilot mixture. High-temperature autoignition, another process by which ignition of the main injection occurs, is observed in main injection plumes where the chemiluminescence signal of the reactive pilot mixture becomes very weak or is absent at the start of main injection. As the reaction of the main injection continues, the non-premixed main injection jet structure is developed and the high-temperature reacting region expands throughout the jet.

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Section: Introductionmentioning

confidence: 99%

The influence of pilot injection on high-temperature ignition processes and early flame structure in a high-speed direct injection diesel engine

Park

Busch

2017

International Journal of Engine Research

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“…The soot emission was reduced due to improved mixing in conjunction with the effect of late fuel injection which resulted in higher in-cylinder temperatures during diffusion combustion, maximising soot oxidation. In order to better understand the mixing process, Zhang et al [38] carried out a series of investigations involving detailed analysis of fuel-air mixing process in a constant volume vessel through the application of laser absorption scattering (LAS). They investigated the mixing process using conventional single injection and compared their results with those obtained through split injection strategies 75%/25%, 50%/50% and 25%/75%.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of hydraulic effects of two-stage fuel injection on fuel-injection systems and diesel combustion in a high-speed optical common-rail diesel engine

Herfatmanesh

Zhao

2012

International Journal of Engine Research

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The final, definitive version of this paper has been published in International Journal of Engine Research, Vol 15 Issue 1, September 2012, ppublished by SAGE Publishing, All rights reserved.In order to meet the ever more stringent emission standards, significant efforts have been devoted to the research and development of internal combustion engines. The requirements for more efficient and responsive diesel engines have led to the introduction and implementation of multiple injection strategies. However, the effects of such injection modes on the hydraulic systems, such as the high-pressure pipes and fuel injectors, must be thoroughly examined and compensated for since the combustion and the formation of pollutants in direct-injection engines are directly influenced by the spatial and temporal distribution of the injected fuel within the combustion chamber. This study investigated the hydraulic effects of two-stage fuel injection on diesel combustion and emissions. The fuel-injection system was characterised for all the tested strategies through the measurement of the fuel-injection rate and quantity. In particular, the interaction between the two injection events was identified. The effects of two-stage injection, dwell angle and the interactions between two consecutive injection events on the combustion process and the emissions were investigated in a high-speed direct-injection single-cylinder optical diesel engine using heat-release analysis and high-speed fuel spray and combustion visualisation techniques. The results indicated that the two-stage injection strategy has the potential for simultaneous reduction of nitrogen oxide, soot and unburned hydrocarbon emissions. The results suggested that an optimum fuel quantity in the first injection exists, 0???30%, with which simultaneous reduction of nitrogen oxide, soot and unburned hydrocarbon emissions can be achieved with the added benefits of improved engine performance, fuel economy and combustion noise. However, higher soot emissions were produced, mainly due to the interaction between the two consecutive fuel-injection events whereby the fuel sprays during the second injection were injected into burning regions, as well as reduced soot oxidation due to the continuation of the combustion into the expansion stroke

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“…In order to better understand the mixing process, Zhang et al [7] carried out a series of investigations involving detailed analysis of fuel-air mixing process in a constant volume vessel through the application of laser absorption scattering. They investigated the mixing process using conventional single injection and compared their results to those obtained through two-stage injection strategies 75%/25%, 50%/50% and 25%/75%.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation into the effects of two-stage injection on fuel injection quantity, combustion and emissions in a high-speed optical common rail diesel engine

Herfatmanesh

Attar

et al. 2013

Fuel

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Characterization of Mixture Formation in Split-Injection Diesel Sprays via Laser Absorption-Scattering (LAS) Technique

Cited by 39 publications

References 18 publications

The influence of pilot injection on high-temperature ignition processes and early flame structure in a high-speed direct injection diesel engine

The influence of pilot injection on high-temperature ignition processes and early flame structure in a high-speed direct injection diesel engine

Experimental investigation of hydraulic effects of two-stage fuel injection on fuel-injection systems and diesel combustion in a high-speed optical common-rail diesel engine

Experimental investigation into the effects of two-stage injection on fuel injection quantity, combustion and emissions in a high-speed optical common rail diesel engine

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