Effects of Injection Timing on Fluid Flow Characteristics of Partially Premixed Combustion Based on High-Speed Particle Image Velocimetry

Najafabadi, Mohammad Izadi; Tanov, Slavey; Wang, Hua; Somers, Lmt Bart; Johansson, Bengt; Dam, Nico

doi:10.4271/2017-01-0744

Cited by 11 publications

(6 citation statements)

References 21 publications

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“…In-cylinder fuel stratification is key in PPC [13]. Thus, injection timing [14] and number of injections become decisive parameters. Several studies of PPC have analyzed the influence of the number of injections on several aspects of engine performance [15] but not on heat rejection.…”

Section: Introductionmentioning

confidence: 99%

Influence of the number of injections on piston heat rejection under low temperature combustion conditions in an optical compression-ignition engine

Tanov

Salvador-Iborra

Andersson

et al. 2017

Energy Conversion and Management

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Section: Introductionmentioning

confidence: 99%

Influence of the number of injections on piston heat rejection under low temperature combustion conditions in an optical compression-ignition engine

Tanov

Salvador-Iborra

Andersson

et al. 2017

Energy Conversion and Management

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“…It is controlled by several parameters: fuel atomization, air entrainment, and in-cylinder turbulence. 38,39 Figures 4(a) to (c) depict that SoC advanced with advancing SoMI timing. This trend was identical for all test fuels and all FIPs.…”

Section: Resultsmentioning

confidence: 99%

Multiple fuel injection strategy for premixed charge compression ignition combustion engine using biodiesel blends

Singh

Jena

Agarwal

2022

International Journal of Engine Research

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In the last decade, advanced combustion techniques of the low-temperature combustion (LTC) family have attracted researchers because of their excellent emission characteristics; however, combustion control remains the main issue for the LTC modes. The objective of this study was to explore premixed charge compression ignition (PCCI) combustion mode using a double pilot injection (DPI; pilot-pilot-main) strategy to achieve superior combustion control and to tackle the soot-oxides of nitrogen (NOx) trade-off. Experiments were carried out in a single-cylinder research engine fueled with 20% v/v biodiesel blended with mineral diesel (B20) and 40% v/v biodiesel blended with mineral diesel (B40) vis-à-vis baseline mineral diesel. Engine speed and rate of fuel-mass injected were maintained constant at 1500 rpm and 0.6 kg/h mineral diesel equivalent, respectively. Pilot injection timings (at 45° and 35° before top dead center (bTDC)) and fuel quantities were fixed, while three fuel injection pressures (FIPs) and four different start of the main injection (SoMI) timings were investigated in this study. Results showed that multiple pilot injections resulted in a stable PCCI combustion mode, making it suitable for higher engine loads. For all test fuels, advancing SoMI timings led to relatively lesser knocking; however, engine performance characteristics degraded at advanced SoMI timings. B40 exhibited relatively superior engine performance among different test fuels at lower FIP; however, the difference in engine performance was insignificant at higher FIPs. Fuel injection parameters showed a significant effect on emissions, especially on the NOx and particulates. Advancing SoMI timing resulted in 20%–50% lower particulates emissions with a slight NOx increase; however, the differences in emissions at different SoMI timings reduced at higher FIPs. Somewhat higher particulates from biodiesel blends were a critical observation of this study, which was more dominant at advanced SoMI timings. Qualitative correlation between NOx-total particulate mass (TPM) was another critical analysis, which exhibited the relative importance of different fuel injection parameters for other alternative fuels. Overall, B20 at 700 bar FIP and 20° SoMI timing emerged as the most promising proposition with some penalty in CO emission.

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“…To understand the impact of the fluid flow effects on PCCI, [37] explored the effects of different injection timings between -60 and -15 CAD (ATDC) of two different injectors with 5 and 7 holes on fluid flow characteristics of PPC from injection to the end of combustion using high-speed PIV measurements that were performed in a light-duty optical engine to detect the combustion performance. The results revealed that later injection leads to higher mean velocity and turbulence level inside the piston bowl and hence higher mixing efficiency.…”

Section: Influence Of Injection Strategy On Pccimentioning

confidence: 99%

A critical review of the performance, combustion, and emissions characteristics of PCCI engine controlled by injection strategy and fuel properties

Elkelawy

Bastawissi

elhamid

et al. 2022

Journal of Engineering Research

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As internal combustion engines (ICEs) produce serious emissions and a big part of greenhouse gases from fuel combustion. Due to the universal concerns about degradation in the ambient environment, limitations on exhaust emissions, depletion of petroleum reserves, and global warming, many strict regulations have been launched on the standard emissions released from engines. These challenges oblige engine researchers worldwide to develop a new strategic balance between engine performance and emissions. Premixed charge compression ignition (PCCI) is a promising technique to overcome these challenges in recent years which can simultaneously reduce NOx and soot emissions and substantially improve thermal efficiency. The PCCI combustion concept has the advantages of both SI and CI engines, like SI engines as the charge is premixed which produces low emissions and like CI engines the fuel-air mixture is auto-ignited as a result of compression which leads to high thermal efficiency. Normally, PCCI combustion is a single-stage combustion process achieved by employing early injection timing to increase the time available for mixing fuel and air by using single-fuel and split fuel (pilot/main) injection tactics, in which a large fraction of fuel burns in premixed combustion phase resulting in relatively lower in-cylinder temperatures compared to compression ignition (CI) combustion. Thus, the objective of this paper is to provide an inclusive review of the effects of fuel injection timings, ratios, pressure, and fuel properties on the PCCI engine combustion performance improvement and emission reduction, this review has been analyzed extensively based on the published studies to provide and discuss different strategies for the control of PCCI technique of combustion at a wide range of speed and load.

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Effects of Injection Timing on Fluid Flow Characteristics of Partially Premixed Combustion Based on High-Speed Particle Image Velocimetry

Cited by 11 publications

References 21 publications

Influence of the number of injections on piston heat rejection under low temperature combustion conditions in an optical compression-ignition engine

Influence of the number of injections on piston heat rejection under low temperature combustion conditions in an optical compression-ignition engine

Multiple fuel injection strategy for premixed charge compression ignition combustion engine using biodiesel blends

A critical review of the performance, combustion, and emissions characteristics of PCCI engine controlled by injection strategy and fuel properties

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