Experimental Investigation of the Initial Stages of Flame Propagation in a Spark-Ignition Engine: Effects of Fuel, Hydrogen Addition and Nitrogen Dilution

Tahtouh, Toni; Halter, Fabien; Mounaïm‐Rousselle, Christine; Samson, Erwann

doi:10.4271/2010-01-1451

Cited by 16 publications

(8 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results can be ascribed to the properties of hydrogen, such as the higher wider flammability limits and the laminar flame speed that promote the flame kernel formation and flame propagation at early stage of mixture combustion [24,26]. On the other hand, for the methane fueling, the narrower flammability limits worsen the flame kernel formation and slows down the flame propagation.…”

Section: Resultsmentioning

confidence: 85%

Analysis of energy efficiency of methane and hydrogen-methane blends in a PFI/DI SI research engine

Catapano

Iorio

Sementa

et al. 2016

Energy

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 85%

Analysis of energy efficiency of methane and hydrogen-methane blends in a PFI/DI SI research engine

Catapano

Iorio

Sementa

et al. 2016

Energy

View full text Add to dashboard Cite

“…Figure 5 shows the Fuel stratification flame propagation process with swirl intensity obtained d from Schlieren method. From the image it can be taken in that increasing the induced-air pressure will be increased the turbulence intensity and swirl ration [12,[25][26][27][28]. As increasing the swirl intensity, will be shortest the period of fuel satisfaction round spark plug and it also had the vortex to become wider around fuel droplet [11,18,19].…”

Section: Resultsmentioning

confidence: 99%

Application of Schlieren Optical Visualization System in External Combustion and Internal Combustion Engine: A Review

Samsudin

Othman

Manshoor

et al. 2015

AMM

View full text Add to dashboard Cite

Schlieren optical visualization technique system is the unique technique due to the ability in producing a neutral image easily-interpretable image of refractive-index-gradient areas. The Schlieren system provides a method for viewing the flow through the transparent media and the most using this technique is to photograph the flow. This paper presents the review of the application of the Schlieren optical visualization system external and internal combustion engine in order to observe the fuel-air mixing and flame development during the burning process. The basic technique of Schlieren system, especially for Z-type and two mirror Schlieren system provide a powerful and clearly image to visualize the changes of the density in a transparent medium. This method can capture spray evaporation, spray interference and mixture formation clearly with real images. Analysis of optical image visualization observations reveals that the mixture formation of fuel and air exhibits the influence of the ignition and flame development. Thus, the observation of systematic control of the creation of a mixture of experimental apparatus allows us to achieve significant progress in the combustion process and will present the information to understanding the basic terms of reduced fuel consumption and exhaust emissions. IntroductionThe first Schlieren system was invented by Robert Hook in the 17th century and Schlieren technique developed in the 19th century by Toepler [1]. The Schlieren technique is an optical technique that detects density gradients occurring in a fluid flow in its simplest from light a slit is collimated by a lens and focused onto a knife-edge by a second lens, the flow pattern is placed between these two lenses and the diffraction pattern that results on a screen or photographic film placed behind the knife-edge is observed. The schlieren technique is often used to investigate heat and mass transfer process in gases and liquid [1][2][3]. Referable to the three dimensionality of the investigated processes, it's virtually inconceivable to get quantitative result about the density gradient from the schlieren image [1,2].The primary reasons why Schlieren technique difficult to produce quantitative results because when the geometry is known or simple like sphere, cylinder or other it is possible to calculate the density gradient. Thither are many types of Schlieren technique, setup, but all the setup are based using the same principle [3][4][5][6].

show abstract

“…7 The use of charge dilution in gasoline spark ignited (SI) engines is limited by the onset of combustion instabilities. Dilution reduces both the flame kernel growth rate 8 as well as the flame speed 3,9 and can lead to poor combustion through either partial burns or misfires depending on which factor dominates at a given operating condition. Beyond a certain dilution level, the frequency of these adverse combustion events increases dramatically, leading to reduced engine performance, increased noise, and increased vibration, all of which are unacceptable in modern engines.…”

Section: Introductionmentioning

confidence: 99%

Characterization of temporal variations and feedback timescales of exhaust gas recirculation gas properties using high-speed diode laser absorption spectroscopy for next-cycle control of cyclic variability

Jatana

Kaul

2018

International Journal of Engine Research

View full text Add to dashboard Cite

Dilute combustion offers efficiency gains in boosted gasoline direct injection engines both through knock-limit extension and thermodynamic advantages (i.e. the effect of γ on cycle efficiency), but is limited by cyclic variability at high dilution levels. Past studies have shown that the cycle-to-cycle dynamics are a combination of deterministic and stochastic effects. The deterministic causes of cyclic variations, which arise from feedback due to exhaust gas recirculation, imply the possibility of using active control strategies for dilution limit extension. While internal exhaust gas recirculation will largely provide a next-cycle effect (short-timescale feedback), the feedback of external exhaust gas recirculation will have an effect after a delay of several cycles (long timescale). Therefore, control strategies aiming to improve engine stability at dilution limit may have to account for both short- and long-timescale feedback pathways. This study shows the results of a study examining the extent to which variations in exhaust gas recirculation composition are preserved along the exhaust gas recirculation flow path and thus the relative importance and information content of the long-timescale feedback pathway. To characterize the filtering or retention of cycle-resolved feedback information, high-speed (1–5 kHz) CO2 concentration measurements were performed simultaneously at three different locations along the low-pressure external exhaust gas recirculation loop of a four-cylinder General Motors gasoline direct injection engine using a multiplexed two-color diode laser absorption spectroscopy sensor system during steady-state and transient engine operation at various exhaust gas recirculation levels. It was determined that cycle-resolved feedback propagates through internal residual gases but is filtered out by the low-pressure exhaust gas recirculation flow system and do not reach the intake manifold. Intermediate variations driven by flow rate and compositional changes are also distinguished and identified.

show abstract

Experimental Investigation of the Initial Stages of Flame Propagation in a Spark-Ignition Engine: Effects of Fuel, Hydrogen Addition and Nitrogen Dilution

Cited by 16 publications

References 37 publications

Analysis of energy efficiency of methane and hydrogen-methane blends in a PFI/DI SI research engine

Analysis of energy efficiency of methane and hydrogen-methane blends in a PFI/DI SI research engine

Application of Schlieren Optical Visualization System in External Combustion and Internal Combustion Engine: A Review

Characterization of temporal variations and feedback timescales of exhaust gas recirculation gas properties using high-speed diode laser absorption spectroscopy for next-cycle control of cyclic variability

Contact Info

Product

Resources

About