Effect of split injections coupled with swirl on combustion performance in DI diesel engines

Li, Xiangrong; Zhou, Haiqin; Zhao, Lei; Su, Liwang; He, Xiangming; Liu, Fushui

doi:10.1016/j.enconman.2016.09.011

Cited by 46 publications

(17 citation statements)

References 26 publications

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“…The swirl in combination with split injection could provide a positive effect on the combustion [13]. The higher the swirl ratio, the shorter the combustion duration.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of multiple pilot injection strategy in an automotive direct injection diesel engine

et al. 2018

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The pilot injection strategy is a widely used approach for reducing the noise of the combustion process in direct injection diesel engines. In the last generation of automotive diesel engines up to several pilot injections could occur to better control the rate of heat release (ROHR) in the cylinder as well as the pollutant formation. However, determination of the timing and duration for each pilot injection needs to be precisely optimised. In this paper an experimental study of the pilot injection strategy was conducted on a direct injection diesel engine. Single and double pilot injection strategy was studied. The engine rated power is 100 kW at 4000 rpm while the rated torque is 320 Nm at 2000 rpm. An engine operating point determined by the rotation speed of 1400 rpm and torque of 100 Nm was chosen. The pilot and pre-injection timing was widely varied in order to study the influence on the combustion process as well as on the fuel consumption.

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“…The swirl in combination with split injection could provide a positive effect on the combustion [13]. The higher the swirl ratio, the shorter the combustion duration.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of multiple pilot injection strategy in an automotive direct injection diesel engine

et al. 2018

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“…High pressure common rail (HPCR) fuel injection system have provided significant benefit for optimizing air-fuel mixing and controlling ignition, combustion, and emissions in diesel engines. With the aid of electronic controllers, HPCR system allows adjustment of injection pressure, fuel injection amount, injection timing, and injection pulse number in each combustion cycle very flexibly [1][2][3]. Then optimized injection strategies can improve diesel engine combustion for low combustion noise, high combustion efficiency, and low emissions [4,5].…”

Section: Introductionmentioning

confidence: 99%

Effects of Injection Rate Profile on Combustion Process and Emissions in a Diesel Engine

Bai¹,

Zhang²,

Du³

et al. 2017

Journal of Combustion

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When multi-injection is implemented in diesel engine via high pressure common rail injection system, changed interval between injection pulses can induce variation of injection rate profile for sequential injection pulse, though other control parameters are the same. Variations of injection rate shape which influence the air-fuel mixing and combustion process will be important for designing injection strategy. In this research, CFD numerical simulations using KIVA-3V were conducted for examining the effects of injection rate shape on diesel combustion and emissions. After the model was validated by experimental results, five different shapes (including rectangle, slope, triangle, trapezoid, and wedge) of injection rate profiles were investigated. Modeling results demonstrate that injection rate shape can have obvious influence on heat release process and heat release traces which cause different combustion process and emissions. It is observed that the baseline, rectangle (flat), shape of injection rate can have better balance between NOx and soot emissions than the other investigated shapes. As wedge shape brings about the lowest NOx emissions due to retarded heat release, it produces the highest soot emissions among the five shapes. Trapezoid shape has the lowest soot emissions, while its NOx is not the highest one. The highest NOx emissions were produced by triangle shape due to higher peak injection rate.

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“…The split injection strategies also include change of injection pressure, injection timing and injection interval [125]. Split injection has been considered as an effective way to tackle the problems associated with exhaust emissions, especially the formation of Nox and particulate matter from diesel engines without adding more complexity to the existing engine [126][127][128][129][130]. The effects of split injection on flame temperature and soot distribution were studied on biodiesel and diesel as the fuels in an optical CI engine by both numerically and experimentally at different injection timings and quantities.…”

Section: Split Injectionmentioning

confidence: 99%

“…Nozzle Geometry Improved performance with small hole diameter but worsened NOx [107,[109][110][111][112] Strategies for NOx reduction i) Using nano additive [113] ii) modified nozzle configuration [114] Split Injection NOx worsened [124] Strategies for NOx reduction i) By advanced injection [99,126] ii) By triple injection [125,127] iii) By EGR [128] Solenoid Injector Better performance [142] Lack of literature thus potential area to work Piston Bowl Improved performance by RTPBG [148] piston bowl modifications needs to be tested along with different fuel injection strategies…”

Section: Fuel Injectionmentioning

confidence: 99%

A Review of Performance-Enhancing Innovative Modifications in Biodiesel Engines

Khan

2020

Energies

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The ever-increasing demand for transport is sustained by internal combustion (IC) engines. The demand for transport energy is large and continuously increasing across the globe. Though there are few alternative options emerging that may eliminate the IC engine, they are in a developing stage, meaning the burden of transportation has to be borne by IC engines until at least the near future. Hence, IC engines continue to be the prime mechanism to sustain transportation in general. However, the scarcity of fossil fuels and its rising prices have forced nations to look for alternate fuels. Biodiesel has been emerged as the replacement of diesel as fuel for diesel engines. The use of biodiesel in the existing diesel engine is not that efficient when it is compared with diesel run engine. Therefore, the biodiesel engine must be suitably improved in its design and developments pertaining to the intake manifold, fuel injection system, combustion chamber and exhaust manifold to get the maximum power output, improved brake thermal efficiency with reduced fuel consumption and exhaust emissions that are compatible with international standards. This paper reviews the efforts put by different researchers in modifying the engine components and systems to develop a diesel engine run on biodiesel for better performance, progressive combustion and improved emissions.

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Effect of split injections coupled with swirl on combustion performance in DI diesel engines

Cited by 46 publications

References 26 publications

Experimental study of multiple pilot injection strategy in an automotive direct injection diesel engine

Experimental study of multiple pilot injection strategy in an automotive direct injection diesel engine

Effects of Injection Rate Profile on Combustion Process and Emissions in a Diesel Engine

A Review of Performance-Enhancing Innovative Modifications in Biodiesel Engines

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