Visualisation of Gasoline and Exhaust Gases Distribution in a 4-Valve SI Engine; Effects of Stratification on Combustion and Pollutants

Deschamps, B.; Baritaud, T.

doi:10.4271/961928

Cited by 17 publications

(3 citation statements)

References 11 publications

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“…The fluorescence imaging and seeding strategy implemented was similar to the one used by Dechamps and Baritaude for imaging burned gas distribution in a SI engine [25]. They used biacetyl as a tracer in intake air and its intensity variation to identify residual gas locations in the engine.…”

Section: Optical Diagnostics Instrumentationmentioning

confidence: 99%

Optical Study of Pre-Chamber Assisted Internal Combustion Engine at Lean Limits

et al. 2022

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Section: Optical Diagnostics Instrumentationmentioning

confidence: 99%

Optical Study of Pre-Chamber Assisted Internal Combustion Engine at Lean Limits

et al. 2022

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“…Residual gas distribution can also be tracked using a 'negative' PLIF imaging system, whereby a homogeneous air/fuel/tracer charge is delivered to the engine and deviations in the uniformity and overall signal strength are attributed to the presence of residual gases. Deschamps and Baritaud [13] performed a negative PLIF visualization of the burned gas distribution in a SI engine using biacetyl as the tracer species. The authors investigated separately the distributions provided by external EGR as well as internal residual gas.…”

Section: Introductionmentioning

confidence: 99%

Residual gas homogeneity measurements

Ghandhi

Bright

Herold

2009

International Journal of Engine Research

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Planar laser-induced fluorescence (PLIF) of a dopant added to the fuel, which was well mixed with the intake air upstream of the engine, was used to investigate inhomogeneities that arise from the incomplete mixing of the intake charge with the residual gas left in the cylinder from the previous cycle. The residual gas fraction was independently measured using a fast-acting solenoid valve and a cylinder dumping technique. The experiments were performed on a four-stroke homogeneous-charge spark-ignition engine operating at light load. The PLIF data were shot-noise-limited, permitting filtering to reduce some noise artefacts; and to further reduce system-induced biases associated with pulse-to-pulse laser variations the data were raymean-normalized, i.e. normalized by the mean of the data along the laser propagation direction. The filtered results had excellent noise characteristics, with a signal-to-noise ratio in excess of 50:1, and allowed the low levels of mixture unmixedness to be identified. The fresh charge was found to exhibit inhomogeneities up to 30u before top dead centre, the latest time investigated. The second moment of the ray-mean-normalized intensity distribution was found to be relatively insensitive to the total residual fraction up to a residual fraction of approximately 30 per cent, having a value of ,0.04. At higher levels of residual there was a monotonic increase in the intensity distribution's second moment.

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“…Planar LIF (PLIF) has previously been applied to a running SI engine for imaging of a variety of species, e.g., OH-radicals (Felton et al, 1988;Becker et al, 1990) and fuel molecules (Andresen et al, 1990;Baritaud and Heinze, 1992;Wolff et al, 1994;Johansson et al, 1995b;Berckmiiller et al, 1997). An indirect method has been developed for measuring the residual gas distribution using PLIF, where the intake air is seeded with biacetyl and the residual gases can be identified as non-fluorescing portions in the images of the pre-ignition mixture (Deschamps and Baritaud, 1996). However, this technique can only yield residual gas distributions averaged over many engine cycles.…”

mentioning

confidence: 99%

Planar Laser-Induced Fluorescence of H₂0 to Study the Influence of Residual Gases on Cycle-to-Cycle Variations in SI Engines

Juhlin

Neij

Versluis

et al. 1998

Combustion Science and Technology

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A tunable KrF excimer laser operating at 248nm is used for visualization of water vapor (H 2 0 ) at engine-like conditions by two-photon laser-induced fluorescence (LIF). The effects of twophoton absorption in water, laser sheet focusing and two-dimensional fluorescence imaging conditions are discussed, and an estimation of the reliability of the image data is given. The water vapor content measured close to the spark plug prior to ignition in a high-pressure combustion cell is correlated to the ensuing combustion rate, which is determined from the evolving pressure during combustion. The combustion rate is shown to be dependent on the water vapor concentration close to the spark plug prior to ignition, where a high water concentration yields a slow combustion. Using two-photon LIF of water vapor, the influence of residual gases on cycle-to-cycle variations is also investigated in a running spark-ignition (SI) engine. With a low inlet manifold pressure, a correlation coefficient of 0.6 is found between the combustion rate and the residual gas concentration close to the spark plug at the time of ignition. Further, a fast combustion in one cycle is found to yield more residual gases in the subsequent cycle.

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Visualisation of Gasoline and Exhaust Gases Distribution in a 4-Valve SI Engine; Effects of Stratification on Combustion and Pollutants

Cited by 17 publications

References 11 publications

Optical Study of Pre-Chamber Assisted Internal Combustion Engine at Lean Limits

Optical Study of Pre-Chamber Assisted Internal Combustion Engine at Lean Limits

Residual gas homogeneity measurements

Planar Laser-Induced Fluorescence of H₂0 to Study the Influence of Residual Gases on Cycle-to-Cycle Variations in SI Engines

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Visualisation of Gasoline and Exhaust Gases Distribution in a 4-Valve SI Engine; Effects of Stratification on Combustion and Pollutants

Cited by 17 publications

References 11 publications

Optical Study of Pre-Chamber Assisted Internal Combustion Engine at Lean Limits

Optical Study of Pre-Chamber Assisted Internal Combustion Engine at Lean Limits

Residual gas homogeneity measurements

Planar Laser-Induced Fluorescence of H20 to Study the Influence of Residual Gases on Cycle-to-Cycle Variations in SI Engines

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Planar Laser-Induced Fluorescence of H₂0 to Study the Influence of Residual Gases on Cycle-to-Cycle Variations in SI Engines