Rapid Characterization of Fuel Atomizers Using an Optical Patternator

Sankar, S. V.; Maher, Kevin; Robart, D. M.; Bachalo, W. D.

doi:10.1115/97-aa-001

Cited by 15 publications

(17 citation statements)

References 6 publications

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“…Aside from OH-PLIF imaging of the reaction zone structures, they measured radial profiles of Sauter mean diameter and droplet volume flux in addition to providing both gas phase and large droplet (>30 lm) velocity fields [13]. Other related studies using Delavan pressure-swirl nozzles include laser sheet drop sizing techniques for rapid characterization of dense sprays [14,15] and an investigation of the effect of fuel injection pressure on fuel spatial distribution and spray cone geometry [16].…”

Section: Introductionmentioning

confidence: 99%

Effects of leading edge entrainment on the double flame structure in lifted ethanol spray flames

Marley

Welle

Lyons

et al. 2004

Experimental Thermal and Fluid Science

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Section: Introductionmentioning

confidence: 99%

Effects of leading edge entrainment on the double flame structure in lifted ethanol spray flames

Marley

Welle

Lyons

et al. 2004

Experimental Thermal and Fluid Science

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“…Because the Mie scattering signal arises from the scattered light from a droplet of the spray, the image intensity of Mie scattering can be considered as representing the liquid-phase distribution in the spray. 22 As shown in Figure 17, the liquid phase of the stratified mixture area decreased significantly with the split injection. In Figure 17, the liquid area of the stratified mixture decreased as the early injection quantity was increased.…”

Section: Spray and Combustion Characteristics Of A Split Injectionmentioning

confidence: 90%

Effects of a split injection in a spray-guided direct-injection spark ignition engine under lean stratified operation

Bae

2014

Proceedings of the Institution of Mechanical Engineers, Part D:

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The effects of a split injection were investigated in a spray-guided direct-injection spark ignition engine under lean stratified operation. In-cylinder pressure analysis, exhaust emissions measurement and visualization of the spray and combustion were applied. From the results using a single-injection strategy, stratified combustion showed advanced and rapid combustion characteristics. However, the low work conversion efficiency and the high nitrogen oxide emissions were obstacles to stratified combustion. Furthermore, the smoke emissions were high as a result of the dominant mixingcontrolled combustion. A dual-injection strategy was applied to control the level of stratified combustion by modifying the dwell time and the split ratio. With a split injection, the nitrogen oxide emissions and the smoke emissions were reduced because of the moderated combustion speed and the enhanced local homogeneity. The liquid phase of the stratified mixture and the luminous sooting flame were reduced significantly as well. However, a low combustion efficiency and a low indicated mean effective pressure resulted owing to the over-mixing effect when the portion of lean premixed combustion was increased. Via moderately controlled stratified combustion, a split injection could be an effective way to reduce the nitrogen oxide emissions and the smoke emissions with a reasonable indicated mean effective pressure and a reasonable combustion efficiency.

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“…More investigations have to be carried out on the fundamentals of spray and combustion of fuel in IC engines [5,6].…”

Section: Introductionmentioning

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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Rapid Characterization of Fuel Atomizers Using an Optical Patternator

Cited by 15 publications

References 6 publications

Effects of leading edge entrainment on the double flame structure in lifted ethanol spray flames

Effects of leading edge entrainment on the double flame structure in lifted ethanol spray flames

Effects of a split injection in a spray-guided direct-injection spark ignition engine under lean stratified operation

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

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