Fuel effect on the liquid-phase penetration of an evaporating spray under transient diesel-like conditions

Pastor, Javier; García-Oliver, José M; Nerva, Jean-Guillaume; Giménez, B.

doi:10.1016/j.fuel.2011.05.006

Cited by 36 publications

(17 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Both results are corroborating this effect as the cylinder charge pressure, temperature, and density are increasing as the SOI is closer to the TDC. This behavior is consistent with previous studies on liquid-fuel penetration in diesel engine [29][30][31].…”

Section: Spray Visualizationsupporting

confidence: 93%

Optical Investigation of Ignition Timing and Equivalence Ratio in Dual-Fuel CNG/Diesel Combustion

Salaün¹,

Apeloig²,

Grisch³

et al. 2016

SAE Technical Paper Series

View full text Add to dashboard Cite

Dual-fuel engines are recognized as a short-medium term solution to reduce fuel consumption and pollutant emissions of CI engines, while maintaining high energy efficiency. Methane (CH 4) was chosen as it offers the best compromise between its heating value and H/C ratio. The high auto-ignition temperature of CH 4 requires auto-igniting a small quantity of liquid diesel before it initiates the combustion of the mixture. Therefore, new engine operations need to be specifically developed. This investigation explores the impact of time sequences of injection of the liquid fuel on the ignition of homogenous methane/air mixture. Experiments were performed on a Rapid Compression Expansion Machine (RCEM), to reproduce the operating and dynamic conditions encountered in a diesel engine cycle, allowing visualizations of fuel injection and combustion processes through a transparent piston. For the purpose of this work, the RCEM was modified to operate under dual-fuel conditions, while controlling the amount of diesel and methane-gas fueled. Experiments were performed for a wide range of equivalence ratios of the premixed charge. The study of the liquid fuel penetration and its consequence on igniting the homogenous charge was achieved using high-speed optical diagnostics. High-speed Schlieren technique (~22 kHz) was applied to characterize the diesel spray penetration, as well as the in-cylinder liquid fuel distribution. High-speed shadowgraphy and OH*-chemiluminescence techniques were used to determine ignitions delays. Moreover, the latest diagnostic was used to analyze the flame structure propagation and the heat release evolution.

show abstract

Section: Spray Visualizationsupporting

confidence: 93%

Optical Investigation of Ignition Timing and Equivalence Ratio in Dual-Fuel CNG/Diesel Combustion

Salaün¹,

Apeloig²,

Grisch³

et al. 2016

SAE Technical Paper Series

View full text Add to dashboard Cite

show abstract

“…A very important factor toward the goal of using cetane fuels in direct injection diesel engines is to characterize of fuel spray [15], [16], [17], [18]. Air fuel mixing is strongly influenced by the spray behavior and fuel properties, therefore the performance of a diesel engine and the requirements discussed in the previous paragraphs for new combustion modes depend on the fuel air distribution within the mixture [19], [20].…”

Section: Most Of the New Combustion Modes Developed Recently To Reducmentioning

confidence: 99%

An experimental study of gasoline effects on injection rate, momentum flux and spray characteristics using a common rail diesel injection system

Payri

García

Domenech

et al. 2012

Fuel

View full text Add to dashboard Cite

Elsevier Payri, R.; García Martínez, A.; Doménech Llopis, V.; Durrett, R.; Plazas, AH. (2012). An experimental study of gasoline effects on injection rate, momentum flux and spray characteristics using a common rail diesel injection system. Fuel. 97:390-399. doi:10.1016Fuel. 97:390-399. doi:10. /j.fuel.2011 Raul Payri, Antonio Garcia, Vicent Domenech, Russell Durrett, Alejandro H. Plazas; An experimental study of gasoline effects on injection rate, momentum flux and spray characteristics using a common rail diesel injection system; FUEL Volume: 97 Pages: 390-399 DOI: 10.1016/j.fuel.2011.11.065, 2012 Page 1/36An experimental study of gasoline effects on injection rate, momentum flux and spray characteristics using a common rail diesel injection system A comparative study using diesel fuel and gasoline has been conducted focusing on the injection process. In this paper an experimental study has been carried out comparing the effects of the different fuels on the mass flow rate, momentum flux and spray visualization in non reactive conditions with a conventional common rail system with a multi-hole injector and two different nozzle designs. Analysis of the results for both fuels show no significant variations of the momentum flux between fuels while mass flow appears to be higher for diesel with respect to gasoline when the injector needle is fully open.The use of gasoline in these injectors seems relevant in the opening and closing phases of the injector.The high-speed imaging under non-evaporative conditions revealed that both diesel and gasoline spray penetration are "quite" similar and the statistical analysis of the results shows good agreement with the literature, furthermore new parametric correlation for gasoline is presented in this work. No major differences in the spray cone angle have been found either, showing consistency with the momentum flux measurements.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Recent studies performed under high-temperature, but non-reactive, unsteady conditions showed that biodiesel can increases LL by up to 20% [5,6] or 100% [7] with respect to conventional diesel fuels. This behavior has been related to its higher density and lower volatility [7,8]. Because of the longer liquid penetration, the proximity of the liquid-phase spray to the quasi-steady flame lift-off length (LOL) is increased, which can potentially modify combustion and emissions formation [10].…”

Section: Introductionmentioning

confidence: 99%

Fundamental spray and combustion measurements of soy methyl-ester biodiesel

Nerva

Genzale

Kook

et al. 2012

International Journal of Engine Research

View full text Add to dashboard Cite

Nerva, J.; Genzale, CL.; Kook, S.; García Oliver, JM.; Pickett, LM. (2013) soy methyl-ester biodiesel is injected into a constant-volume combustion facility. A range of optical diagnostics is performed, comparing biodiesel to a conventional #2 diesel at the same injection and ambient conditions. Schlieren imaging shows virtually the same vapor-phase penetration for the two fuels, while simultaneous Mie-scatter imaging shows that the maximum liquid-phase penetration of biodiesel is higher than diesel due to their different boiling-point temperatures. But the different liquid-phase penetration does not affect overall mixing rate and downstream vapor-phase penetration because each fuel spray has similar momentum and spreading angle. The ignition delay and lift-off length are only slightly less for biodiesel compared to diesel, consistent with the CN. Because of the similarity in lift-off length, the differences in equivalence ratio distribution at the lift-off length are mainly affected by the fuels oxygen content. For biodiesel, the equivalence ratio is reduced, which, along with the fuel molecular structure and oxygen content, significantly affects soot formation downstream. Spatially-resolved soot volume fraction measurements obtained by combining laser extinction measurements with planar laser-induced incandescence imaging show that the soot concentration can be reduced by an order of magnitude for biodiesel. These integrated measurements of spray mixing, combustion, and quantitative soot concentration provide new validation data for the development of CFD spray, combustion, and soot formation models suitable for the latest biofuels. AbstractThough biodiesel has begun to penetrate the fuel market, its effect on injection processes, combustion, and emissions formation under diesel engine conditions remains somewhat unclear. Typical tailpipe measurements from engines running biodiesel indicate that PM, CO and UHC are decreased, whereas NO X emissions tend to be increased. However, these observations are the result of complex interactions between physical and chemical processes occurring in the combustion chamber, for which understanding is still needed.To characterize and decouple the physical and chemical influences of biodiesel on spray mixing, ignition, combustion and soot formation, a soy methyl-ester biodiesel is injected into a constant-volume combustion facility under diesel-like operating conditions. A range of optical diagnostics is performed, comparing biodiesel to a conventional #2 diesel at the same injection and ambient conditions.Schlieren high-speed imaging shows virtually the same vapor-phase penetration for the two fuels, while simultaneous Mie-scatter imaging shows that the maximum liquid-phase penetration of biodiesel is higher than diesel. Differences in the liquid-phase penetration are expected because of the different boiling-point temperatures of the two fuels. But the different liquid-phase penetration does not affect overall mixing rate and downstream vapor-phase penetration because each...

show abstract

Fuel effect on the liquid-phase penetration of an evaporating spray under transient diesel-like conditions

Cited by 36 publications

References 20 publications

Optical Investigation of Ignition Timing and Equivalence Ratio in Dual-Fuel CNG/Diesel Combustion

Optical Investigation of Ignition Timing and Equivalence Ratio in Dual-Fuel CNG/Diesel Combustion

An experimental study of gasoline effects on injection rate, momentum flux and spray characteristics using a common rail diesel injection system

Fundamental spray and combustion measurements of soy methyl-ester biodiesel

Contact Info

Product

Resources

About