Experimental and Theoretical Analysis of Flame Development and Misfire Phenomena in a Spark-Ignition Engine

Hacohen, J.; Belmont, M.R.; Thurley, R.; Thomas, J. C.; Morris, E.L.; Buckingham, David

doi:10.4271/920415

Cited by 29 publications

(5 citation statements)

References 5 publications

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“…Moreover, each 8-bit cycle-resolved image was converted in a numerical matrix. In this way it was possible to evaluate the integral luminous signal and the local signal related to each point of the combustion chamber [13,14].…”

Section: Setup For Optical Measurementsmentioning

confidence: 99%

Optical investigation of the fuel injector influence in a PFI spark ignition engine for two-wheel vehicles

2012

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This paper describes the results obtained in a port fuel injection spark-ignition (PFI SI) engine by optical diagnostics during the fuel injection and the combustion process. A research optical engine was equipped with the fuel injection system, the head and the exhaust device of a commercial 250 cc engine for scooters and small motorcycles. Two injectors were tested: standard 3-hole injector that equipped the real reference engine and a 12-hole injector. The intake manifold was modified to allow the visualization of the fuel injection using an endoscopic system coupled with CCD camera. Size and number of the fuel droplets were evaluated through an image processing procedure. The cycle resolved visualization and chemiluminescence allowed to follow the combustion process from the spark ignition to the exhaust phase. All the optical data were correlated with engine parameters and exhaust emissions. The effect of the fuel injector type on deposits formed by fuel accumulation and dripping on the intake valves steams and seats was investigated. In particular, the evolution of diffusion-controlled flames due to the fuel deposits burning was analyzed. These flames were principally located near the intake valves, and they persisted well after the normal combustion event. The consequences were the formation and emission of soot and unburned hydrocarbons. The multi-hole injector helped reducing wall wetting and deposit formation so that the emission characteristic can be improved. The use of 12-hole injector allowed a more homogeneous distribution for a lower time of fuel droplets in the intake manifold than the 3-hole injector. This study also investigated the detailed physical/chemical phenomena to figure out reasons for the improvement using optical measurements.

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Section: Setup For Optical Measurementsmentioning

confidence: 99%

Optical investigation of the fuel injector influence in a PFI spark ignition engine for two-wheel vehicles

2012

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“…Note that the spark advance has to be bounded both from above and from below to prevent the mix from not burning uniformly, thus causing undesired knocking [41], [42] (upper bound) and from misfiring [43], [44] (lower bound), which causes undesired pollutants. These bounds depend on the revolution speed .…”

Section: B the Modelmentioning

confidence: 99%

Automotive engine control and hybrid systems: challenges and opportunities

Balluchi¹,

Benvenuti²,

et al. 2000

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“…A simple zero-dimensional thermodynamic model Normalized evolution time (17)(18)(19) has been employed to provide estimates of the effect on i.m.e.p., of variability in the onset of a 'switch' in flame speeds caused by a phenomenon such as tumble collapse. This model has been described in detail previously by the authors (17)(18)(19), but in essence it uses correlations to describe flame speed and employs a Wiebe function for the main bum phase.…”

Section: Simple Estimates Of the Cyclic Variation In 1mep Due To Vmentioning

confidence: 99%

“…This model has been described in detail previously by the authors (17)(18)(19), but in essence it uses correlations to describe flame speed and employs a Wiebe function for the main bum phase. The uncertainties involved in the overall physical situation considered do not seem to justify a more sophisticated approach.…”

Section: Simple Estimates Of the Cyclic Variation In 1mep Due To Vmentioning

confidence: 99%

Tumble and Swirl: Are they a Mixed Blessing?

Belmont

Hacohen

Carpenter

1994

Proceedings of the Institution of Mechanical Engineers, Part D:

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The results of a simple simulation model incorporating the cyclic jluctuations in j a m velocity resulting from the corresponding variability in turbulence onset and generation imply that at low load conditions suchfluctuations can induce changes of the order of many per cent in the indicated mean efective pressure (i.m.e.p.). The methods employed here are relatively unsophisticated; however, the scales of the effects are suficient to sound at least a cautionary note to the introduction of processes such as tumble collapse into lean burn technologies without taking due notice of the possible disadvantages.

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Experimental and Theoretical Analysis of Flame Development and Misfire Phenomena in a Spark-Ignition Engine

Cited by 29 publications

References 5 publications

Optical investigation of the fuel injector influence in a PFI spark ignition engine for two-wheel vehicles

Optical investigation of the fuel injector influence in a PFI spark ignition engine for two-wheel vehicles

Automotive engine control and hybrid systems: challenges and opportunities

Tumble and Swirl: Are they a Mixed Blessing?

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