Experimental study on the diesel and biodiesel spray characteristics emerging from equilateral triangular orifice under real diesel engine operation conditions

— The spray characteristic of the injected fuel is mainly depends upon fuel injection pressure, temperature, ambient pressure, fuel viscosity and fuel density. An experimental study was conducted to examine the effect of injection pressure on the spray was injected into direct injection (DI) diesel engine in the atmospheric condition. In Diesel engine, the window of 20 mm diameter hole and the transparent quartz glass materials were used for visualizing spray characteristics of combustion chamber at right angle triangle position. The varying Injection pressure of 180 - 240 bar and the engine was hand cranked for conducting the experiments. Spray characteristics for Jatropha oil methyl ester (JOME) and diesel were studied experimentally. Spray tip penetration and spray cone angle were measured in a combustion chamber of Direct Injection diesel engine by employing high speed Digital camera using Mie Scattering Technique and ImageJ software. The study shows the JOME gives longer spray tip penetration and smaller spray cone angle than those of diesel fuels. The Spray breakup region (Reynolds number, Weber number), Injection velocity and Sauter Mean Diameter (SMD) were determined for diesel and JOME. SMD decreases for JOME than diesel and the Injection velocity, Reynolds Number, Weber Number Increases for JOME than diesel.

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Engine Performance and Emissions Formation for RME and Conventional Diesel Oil: A Comparative Study

ASME 2009 Internal Combustion Engine Division Spring Technical Conference ◽

10.1115/ices2009-76121 ◽

2009 ◽

Cited By ~ 4

Author(s):

Junfeng Yang ◽

Monica Johansson ◽

Valeri Golovitchev

Keyword(s):

Diesel Engine ◽

Comparative Study ◽

Soot Formation ◽

Engine Performance ◽

Oxidation Mechanism ◽

Diesel Oil ◽

Engine Operation ◽

Operation Conditions ◽

Performance And Emissions ◽

Engine Performance And Emissions

A comparative study on engine performance and emissions (NOx, soot) formation has been carried out for the Volvo D12C diesel engine fueled by Rapeseed Methyl Ester, RME and conventional diesel oil. The combustion models, used in this paper, are the modifications of those described in [1–2]. After the compilation of liquid properties of RME specified as methyl oleate, C19H36O2, making up 60% of RME. The oxidation mechanism has been compiled based on methyl butanoate ester, mb, C5H10O2 oxidation model [3] supplemented by the sub-mechanisms for two proposed fuel constituent components, methyl decanoate, md, C11H22O2, n-heptane, C7H16, and soot and NOx formations reduced and “tuned” by using the sensitivity analysis. A special global reaction was introduced to “crack” the main fuel into constituent components, md, mb and propyne, C3H4, to reproduce accurately the proposed RME chemical formula. The sub-mechanisms were collected in the general one consisting of 99 species participating in 411 reactions. The combustion mechanism was validated using shock-tube ignition-delay data at diesel engine conditions and flame propagation speeds at atmospheric conditions. The engine simulations were carried out for Volvo D12C engine fueled both RME and conventional diesel oil. The numerical results illustrate that in the case of RME, nearly 100% combustion efficiency was predicted when the cumulative heat release, was compared with the RME LHV, 37.2 kJ/g.. To minimize NOx emissions, the effects of 20–30% EGR levels depending on the engine loads and different injection strategies were analyses. To confirm the optimal engine operation conditions, a special technique based on the time-transient parametric φ-T maps [4] has been used.

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Experimental Study of the Spray Characteristics of Diesohol Fuel using a High-Pressure Common-Rail Injection System in a Diesel Engine

Energy Technology ◽

10.1002/ente.201500043 ◽

2015 ◽

Vol 3 (9) ◽

pp. 896-905 ◽

Cited By ~ 7

Author(s):

L. B. Song ◽

Q. Z. Lin ◽

Y. Z. Xie ◽

H. W. Hu ◽

H. Q. Hu ◽

...

Keyword(s):

Experimental Study ◽

High Pressure ◽

Diesel Engine ◽

Common Rail ◽

Injection System ◽

Spray Characteristics ◽

Common Rail Injection System ◽

Common Rail Injection ◽

High Pressure Common Rail

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An Experimental Study of Normal-Hexadecane and Iso-Dodecane Binary Fuel Blends in a Military Diesel Engine

ASME 2012 Internal Combustion Engine Division Fall Technical Conference ◽

10.1115/icef2012-92151 ◽

2012 ◽

Author(s):

Leonard J. Hamilton ◽

Jim S. Cowart ◽

Dianne Luning-Prak ◽

Patrick A. Caton

Keyword(s):

Experimental Study ◽

Diesel Engine ◽

Fuel Injection ◽

Cetane Number ◽

Straight Chain ◽

Load Range ◽

Binary Blends ◽

Engine Operation ◽

Fuel Blends ◽

Branched Alkanes

The molecular composition of new hydrotreated renewable fuels consists of both straight chain and branched alkanes. These new fuels do not contain aromatic or cyclo-paraffinic hydro-carbon compounds which are regularly seen in conventional petroleum fuels. Both experimental and modeling work has shown that straight chain alkanes have shorter ignition delays (e.g. higher cetane number) as compared to branched alkanes. In order to better understand the effects of branched and straight chain alkanes fuels in diesel engines, an experimental study was pursued using binary blends of iso-dodecane (iC12H26 with abbreviation: iC12) and normal-hexadecane (nC16H34 with abbreviation nC16) in a military diesel engine (AM General HMMWV ‘Humvee’ engine). Mixtures of 50% iC12 with 50% nC16 as well as 25% iC12 with 75% nC16 were compared to 100% nC16 (cetane) fueled engine operation across the entire speed-load range. Higher nC16 fuel content operation resulted in modestly earlier fuel injection events and combustion phasing that delievered slightly worse engine brake performance (torque and fuel consumption). Interestingly, ignition delay and overall burn durations were relatively insensitive to the binary blends tested. The significantly different physical properties of iC12 relative to nC16 are believed to affect the fuel injection event leading to later fuel injection with increasing iC12 content. Later injection into a hotter chamber mitigates the lower cetane number of the higher iC12 content fuel blends.

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Diesel Engine Optimization for Electric Hybrid Vehicles

Journal of Energy Resources Technology ◽

10.1115/1.3068347 ◽

2009 ◽

Vol 131 (1) ◽

Cited By ~ 14

Author(s):

Talal F. Yusaf

Keyword(s):

Diesel Engine ◽

Maximum Temperature ◽

Exhaust Emission ◽

Oxides Of Nitrogen ◽

Engine Operation ◽

Performance And Emission ◽

Operation Conditions ◽

Lubricant Oil ◽

Emission Testing ◽

Engine Life

Performance and emission testing for a single cylinder four-stroke diesel engine have been experimentally performed to determine the optimum operation conditions for this engine when it is used as a hybrid power unit. The studied operation parameters included brake specific fuel consumption (BSFC), exhaust emission (NOx, CO, CO2, and O2), and engine life. The results indicate that the lowest BSFC of the engine was found when the engine runs around 1 kW charging load at speed ranged between 1900 rpm and 2700 rpm. As the speed of the engine is maintained constant, the minimum level of BSFC is below 300 g/kW h at around 1900 rpm. The best engine operation conditions, for low emission, are found at engine speed around 2500 rpm. It was found that the oxides of nitrogen remain within the acceptable level (below 180 ppm) for such a diesel engine. The battery charge has been conducted at constant speeds, where the lubricant oil temperature was constant and always below maximum temperature; this is a good indication for longer engine life.

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