Comparison of Diesel Engine Efficiency and Combustion Characteristics Between Different Bore Engines

2018 ◽  
Vol 140 (10) ◽  
Author(s):  
Jue Li ◽  
Timothy J. Jacobs ◽  
Tushar Bera ◽  
Michael A. Parkes
Keyword(s):  
Diesel Engine ◽  
Combustion Engine ◽  
Volume Ratio ◽  
Mechanical Efficiency ◽  
Combustion Characteristics ◽  
Stroke Length ◽  
Engine Load ◽  
Engine Efficiency ◽  
Brake Mean Effective Pressure ◽  
The Difference

This study investigates the effects of engine bore size on diesel engine performance and combustion characteristics, including in-cylinder pressure, ignition delay, burn duration, and fuel conversion efficiency, using experiments between two diesel engines of different bore sizes. This study is part of a larger effort to discover how fuel property effects on combustion, engine efficiency, and emissions may change for differently sized engines. For this specific study, which is centered only on diagnosing the role of engine bore size on engine efficiency for a typical fuel, the engine and combustion characteristics are investigated at various injection timings between two differently sized engines. The two engines are nearly identical, except bore size, stroke length, and consequently displacement. Although most of this diagnosis is done with experimental results, a one-dimensional model is also used to calculate turbulence intensities with respect to geometric factors; these results help to explain observed differences in heat transfer characteristics of the two engines. The results are compared at the same brake mean effective pressure (BMEP) and show that engine bore size has a significant impact on the indicated efficiency. It is found that the larger bore engine has a higher indicated efficiency than the smaller displaced engine. Although the larger engine has higher turbulence intensities, longer burn durations, and higher exhaust temperature, the lower surface area to volume ratio and lower reaction temperature leads to lower heat losses to the cylinder walls. The difference in the heat loss to the cylinder walls between the two engines is found to increase with increasing engine load. In addition, due to the smaller volume-normalized friction loss, the larger sized engine also has higher mechanical efficiency. In the net, since the brake efficiency is a function of indicated efficiency and mechanical efficiency, the larger sized engine has higher brake efficiency with the difference in brake efficiency between the two engines increasing with increasing engine load. In the interest of efficiency, larger bore designs for a given displacement (i.e., shorter strokes or few number of cylinders) could be a means for future efficiency gains.

Performance Analysis of Pongamia Biodiesel as an Alternative Fuel for CI Engine

2019 ◽  
Vol 895 ◽  
pp. 139-143
Author(s):  
A. Anand ◽  
B.S. Nithyananda ◽  
G.V. Naveen Prakash
Keyword(s):  
Diesel Engine ◽  
Energy Use ◽  
Methyl Esters ◽  
Mechanical Efficiency ◽  
Alternative Fuel ◽  
Transportation Fuels ◽  
Brake Mean Effective Pressure ◽  
Ci Engine ◽  
Economical Growth ◽  
Pongamia Methyl Ester

India is a fastest growing major economy in 2018, with a growth rate of 7.4 per cent GDP. Energy use in developing countries like India has risen more than fourfold over the past three decades and is expected to continue increasing rapidly in the future. Energy is essential for a economical growth of any county. Biofuels derived from renewable resources will become a alternative supplement for the conventional energy sources in meeting the increasing requirements for transportation fuels. In the present paper, effort are made to evaluate the pongamia biodiesel of 20% Blend (PB20) with neat diesel as an alternative fuel for CI engine. The pongamia oil is converted into pongamia methyl esters (Biodiesel) using two step process Esterification and Transesterification. The fuel properties of raw pongamia methyl ester and blend (PB20) are evaluated as per ASTM/BIS standards to check their feasibility as an alternative fuel. The prepared blend is used to run the computerized CRDI diesel engine at different load conditions. From the experimental investigation made, PB20 has a potential to be as an alternative fuel for diesel engine. The performance of PB20 with respect to Brake Thermal Efficiency (BTHE), Mechanical Efficiency, Brake Mean Effective Pressure (BMEP) and Specific Fuel Consumption (SFC) is comparatively low when compared to neat diesel. The P-Ɵ and P-V diagram shows that the combustion of PB20 is as similar to that of neat diesel.

Methyl Oleate Evaluation as a Model Fuel for Peanuts FAME, in an Indirect Injection Diesel Engine

2012 ◽  
Author(s):  
Valentin Soloiu ◽  
Jabeous Weaver ◽  
Marvin Duggan ◽  
Henry Ochieng ◽  
Brian Vlcek ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Methyl Oleate ◽  
Mechanical Efficiency ◽  
Combustion Characteristics ◽  
Heat Fluxes ◽  
Diffusion Combustion ◽  
Combustion Modeling ◽  
Ultra Low Sulfur Diesel ◽  
Auxiliary Power ◽  
Model Fuel

This study investigates the combustion characteristics of methyl oleate (oleic FAME) produced from oleic acid. This compound is the main fatty acid component of peanut FAME, a potential renewable biofuel. Methyl oleate has been suggested in our previous work as a reference fuel or surrogate for biodiesel for advanced research (simulation and experiments), or as an enrichment compound to improve biodiesel’s fuel properties. This investigation compares the combustion and emissions characteristics of methyl oleate to peanut FAME and ultra-low sulfur diesel No. 2 (ULSD), in a single-cylinder indirect injection diesel engine intended for use as an auxiliary power unit. The dynamic viscosity of peanut FAME (P100) and Methyl Oleate (O100) was found to be 5.2 cP and 4.3 cP, respectively, at 40°C. It was determined from the ASTM standards for biodiesel that up to 50% FAME could be run in the engine. The lower heating value of P100 and O100 was 36 MJ/kg and 37 MJ/kg respectively, compared to 42.7MJ/kg for ULSD. With a combustion time of 2ms, P50 and O50 have shown similar combustion characteristics with ignition delays of about 1 ms at 2200rpm, 6.2 imep (100% load). The P50, O50, and ULSD heat release, with premixed phase combining with diffusion combustion, produced maximum values of 20.3 J/CAD, 22.7 J/CAD, and 21.9 J/CAD respectively. The heat fluxes were calculated by the Annand model, and a 2% increase in maximum total heat flux was observed for O50 compared with a maximum value of 1.95 MW/m2 for ULSD and P50. The mechanical efficiency of 77% was similar for all tested FAME blends and ULSD. The NOx increased for P20 by 6% compared with ULSD while for P50 it was similar to the ULSD values. The NOx emissions of methyl oleate showed a similar trend with that of ULSD. The soot values were relatively constant for all of the methyl oleate blends and increased by 14% for P50 when comparing both fuels to ULSD. The findings support the use of methyl oleate as a reference or model fuel for combustion modeling, and as a compound for enriching biodiesel.

scholarly journals Performance and Emission Test in CI Engine using Magnetic Fuel Conditioning with Nano Additives

2019 ◽  
Vol 8 (3) ◽  
pp. 7823-7826
Keyword(s):  
Diesel Engine ◽  
Diesel Fuel ◽  
Substantial Reduction ◽  
Volume Ratio ◽  
Combustion Characteristics ◽  
Performance And Emission ◽  
Uniform Dispersion ◽  
Performance And Emissions ◽  
Neodymium Magnets ◽  
Alternate Fuels

An Experimental investigation was carried out to find out combustion performance and emissions characteristics of diesel engine using nano-aluminum oxide (n-Al2O3 ) mixed diesel. The n-Al2O3 of size 50 nm was mixed into diesel fuel at the rate of 0.5g/l and 1g/l for formulation of new alternate fuels. The nAl2O3 was dispersed by means of an ultrasonic sonificator in order to produce uniform dispersion of n-Al2O3 in the diesel fuel. Nano-Al2O3 possesses better combustion characteristics and enhanced surface-area-to-volume ratio and hence allows more amount of diesel to react with the oxygen which in turn enhances the burning efficiency of the test fuels. This also enhanced using neodymium magnets which separates the molecules of the clustered hydrocarbon. The magnets are fitted across the fuel line to give best magnetic field for the fuel to flow through. The diesel fuel with and without n-Al2O3 additive were tested in a variable compression diesel engine at different load conditions and the results revealed that a considerable amount of enhancement in the brake thermal efficiency and substantial reduction in content of NOx and unburnt hydrocarbon (UBHC) at all the loads compared to neat diesel were observed due to nano Al2O3 ’s better combustion characteristics and improved degree of mixing with air

scholarly journals Operational Parameters of a Diesel Engine Running on Diesel–Rapeseed Oil–Methanol–Iso-Butanol Blends

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6173
Author(s):  
Jakub Čedík ◽  
Martin Pexa ◽  
Michal Holúbek ◽  
Jaroslav Mrázek ◽  
Hardikk Valera ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Rapeseed Oil ◽  
Operational Parameters ◽  
Turbocharged Diesel Engine ◽  
Engine Load ◽  
Soot Particles ◽  
Engine Efficiency ◽  
Fuel Blends ◽  
Mean Size ◽  
Blended Fuels

This contribution focuses on utilizing blended biofuels of rapeseed oil and methanol with diesel. Rapeseed is one of the most cultivated energy crops in Europe, and its purpose in the blends is to increase the bio-content in test fuels. The purpose of methanol in the blends is to increase bio-content and compensate for the higher viscosity of the rapeseed oil. As methanol is almost insoluble in diesel and rapeseed oil, iso-butanol is used as a co-solvent. The fuel blends were tested in volumetric concentrations of diesel/rapeseed oil/methanol/iso-butanol 60/30/5/5, 50/30/10/10, and 50/10/20/20. Diesel was used as a reference. The measurements were performed on a turbocharged diesel engine Zetor 1204, loaded using the power-takeoff shaft of the Zetor Forterra 8641 tractor. In this paper, the effect of the blended fuels on performance parameters, engine efficiency, production of soot particles, and regulated and unregulated emissions are monitored and analyzed. It was found that engine power decreased by up to 27%, efficiency decreased by up to 5.5% at full engine load, emissions of NOX increased by up to 21.9% at 50% engine load, and production of soot particles decreased; however, the mean size of the particles was smaller.

scholarly journals Effect of LPG Content on the Performance and Emissions of A Diesel-LPG Dual-Fuel Engine

1970 ◽  
Vol 46 (2) ◽  
pp. 195-200 ◽  
Author(s):  
GA Rao ◽  
AVS Raju ◽  
CVM Rao ◽  
KG Rajulu
Keyword(s):  
Diesel Engine ◽  
Diesel Fuel ◽  
Agricultural Sector ◽  
Mechanical Efficiency ◽  
Operating Conditions ◽  
Dual Fuel ◽  
Engine Operation ◽  
Engine Load ◽  
Performance And Emission ◽  
Combustion Performance

In the present work, LPG, a by-product of petroleum refining process is used to replace conventional diesel fuel, partially, for improved combustion efficiency and clean burning. A conventional diesel engine was operated on the dual-fuel mode, using LPG as the primary fuel and diesel as the pilot fuel. A four-stroke, single-cylinder diesel engine, most widely used in agricultural sector, has been considered for the purpose of experimentation. The engine was operated at a constant speed of 1500 rpm at a low engine load of 20% and a high engine load of 80%. Under both these operating conditions, combustion, performance and emission characteristics of the engine have been evaluated and compared with that of baseline diesel fuel operation. At 20 % engine load the brake thermal efficiency of the engine has found to decrease with an increase in the LPG content. On the other hand at 80% engine load, it has increased with an increase in the LPG content. Same trend has been observed with regard to the mechanical efficiency. The volumetric efficiency has decreased with an increase in the LPG content at both the loads. The engine operation is more economical on dual-fuel operation at 80% engine load, whereas at 20% engine load, diesel fuel operation is found to be better. With regard to emissions, smoke density and emissions of NOx were found to reduce with an increase in LPG content at both the loads; however, emissions of HC and CO have shown the reverse trend. Key words: Dual-Fuel; LPG; Diesel; Combustion; Performance; Emissions Load. DOI: http://dx.doi.org/10.3329/bjsir.v46i2.8186 Bangladesh J. Sci. Ind. Res. 46(2), 195-200, 2011

Effects of Nano-Sized Metal Oxide Additive on Performance and Exhaust Emissions of C I Engine

2015 ◽  
Vol 766-767 ◽  
pp. 389-395 ◽  
Author(s):  
S.P. Venkatesan ◽  
P.N. Kadiresh
Keyword(s):  
Diesel Engine ◽  
Diesel Fuel ◽  
Direct Injection ◽  
Substantial Reduction ◽  
Volume Ratio ◽  
Combustion Characteristics ◽  
Brake Thermal Efficiency ◽  
Uniform Dispersion ◽  
Enhanced Surface ◽  
Load Conditions

An Experimental investigation was carried out to determine performance, emissions and combustion characteristics of diesel engine using nanoaluminum oxide (n-Al2O3) blended diesel fuel. The n-Al2O3 of size 40 nm was blended into diesel fuel. The different dosing levels studied were 250mg, 500mg, 750mg, and 1000mg. Each dosing levels of nanoparticles were mixed with one litre of diesel to prepare test fuels. The n-Al2O3was dispersed by means of an ultrasonic vibrator in order to produce uniform dispersion of n-Al2O3 in the diesel fuel. nanoAl2O3possess better combustion characteristics and enhanced surface-area-to-volume ratio and hence allows more amount of diesel to react with the oxidizer which in turn enhances the burning efficiency of the test fuels. The diesel fuel with and without n-Al2O3 additive were tested in a direct injection diesel engine at different load conditions and the results revealed that a considerable enhancement in the brake thermal efficiency and substantial reduction in content of NOX and unburnt hydrocarbon (UBHC) at all the loads compared to neat diesel were observed due to nanoAl2O3’s better combustion characteristics and improved degree of mixing with air.

scholarly journals One-Dimensional Modeling of Mechanical and Friction Losses Distribution in a Four-Stroke Internal Combustion Engine

2019 ◽  
Vol 142 (1) ◽  
Author(s):  
Bernardo Tormos ◽  
Jaime Martín ◽  
Diego Blanco-Cavero ◽  
Antonio J. Jiménez-Reyes
Keyword(s):  
Diesel Engine ◽  
Combustion Engine ◽  
Direct Injection ◽  
Mechanical Efficiency ◽  
Road Transport ◽  
The European Union ◽  
The Road ◽  
Ring Assembly ◽  
1D Model ◽  
Mechanical Elements

Abstract As the road transport accounts between 15%–18% of worldwide CO2 emissions, the automotive sector has a deep commitment to mitigate global warming. Consequently, stricter regulations have been adopted by the European Union and worldwide to reduce that big impact. Approximately, 10% of the energy generated by fuel combustion in the engine is destined to the auxiliaries components activation and the movement of mechanical elements with relative motion between themselves. A reduction on that figure or alternatively a mechanical efficiency improvement can be directly translated on target alignment. The aim of this work is developing a model to predict the mechanical and friction losses and its distribution in a four-stroke direct injection-diesel engine and simulating different strategies, which increment the engine efficiency. A 1D model has been developed and fitted in gt-suite based on the experimental results of a 1.6-L diesel engine. Additionally, a description of the tribological performance has been realized in different parts of the engine where friction is present. Finally, the engine friction maps have been broken down in order to quantify the friction losses produced in the piston ring assembly, crankshaft bearings, and valvetrain.

A comprehensive review on performance, emission and combustion characteristics of diesel engines fuelled with algae oil methyl esters

2020 ◽  
pp. 160-168
Author(s):  
Tahir Ali Khan ◽  
Tasmeem Ahmad Khan ◽  
Ashok Kumar Yadav ◽  
M. Emran Khan ◽  
Amit Pal
Keyword(s):  
Diesel Engine ◽  
Methyl Ester ◽  
Methyl Esters ◽  
Combustion Characteristics ◽  
Exhaust Emission ◽  
Comprehensive Review ◽  
Engine Efficiency ◽  
Ci Engine ◽  
Algae Oil ◽  
Green Fuel

The aim of present paper is to study the performance of diesel engine utilizing algae oil methyl ester (AOME) as green fuel and to investigate the chance of using AOME blend with diesel widely instead of diesel. This review incorporates the investigation of AOME from various strains of algae in different kinds of diesel engine. The majority of the examinations consent to the reduction in exhaust emission and the increase in Engine efficiency while utilizing AOME in CI engine. Numerous scientists revealed increment in NOx. As a conclusion, it has been found that algae oil is barely investigated and till date few of past papers contain opposing outcomes or non-very much contemplated practices as this overview illustrates.

The Engine Performance Characteristics of an IDI Diesel Engine Fueled by Soybean Oil Methyl Esters

2019 ◽  
Vol 1 (1) ◽  
pp. 19
Author(s):  
A Ghurri ◽  
S K Keun
Keyword(s):  
Experimental Investigation ◽  
Diesel Engine ◽  
Engine Speed ◽  
Methyl Esters ◽  
Engine Performance ◽  
Mechanical Efficiency ◽  
Heating Value ◽  
Lower Heating Value ◽  
The Difference ◽  
Lower Heating

An experimental investigation was conducted to evaluate the performance of anindirect injection (IDI) diesel engine using diesel (D100) and diesel-biodieselblends (BD25, BD45, BD65) separately. The engine was run in various engineloads at constant engine speed ranging from 1000 to 2400 rpm with an interval200 rpm. The results showed that the biodiesel content decreased the enginetorque and power. This might be mainly affected by the lower LHV of thebiodiesel, and also the worse combustion due to higher density of the biodieselcompared to the diesel fuel. The loss of power due to lower heating value ofbiodiesel were not as high as the difference in their heating value that might bedown to the better lubricity of biodiesel as proved in the higher brake thermalefficiency and mechanical efficiency when using the biodiesel blends. The brakespecific fuel consumption is higher with the increase of biodiesel content but thediesel fuel delivered the highest energy to run the engine. The maximum pressureinside cylinder and the heat release rate of D100 is slightly higher than those ofbiodiesel blends.Keywords: diesel engine, biodiesel, engine performance, emission.

scholarly journals Evaluation of the performance and gas emissions of a tractor diesel engine using blended fuel diesel and biodiesel to determine the best loading stages

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Haitham Emaish ◽  
Khamael M. Abualnaja ◽  
Essam E. Kandil ◽  
Nader R. Abdelsalam
Keyword(s):  
Fuel Consumption ◽  
Specific Fuel Consumption ◽  
Fuel Blend ◽  
Gas Emissions ◽  
Brake Thermal Efficiency ◽  
Engine Load ◽  
Engine Efficiency ◽  
Brake Mean Effective Pressure ◽  
Blended Fuel ◽  
Tractor Diesel

AbstractFossil fuels are the main energy sources responsible for harmful emissions and global warming. Using biodiesel made from waste deep-frying oil as an alternative fuel source in diesel engines has drawn great attention. This biodiesel is produced using the transesterification process and blends with mineral diesel at Faculty of Agriculture Saba Basha, Alexandria University, Egypt. The turbocharged diesel engine of a Kubota M-90 tractor was tested. The objectives of this work are to test tractor as a source of power in the farm using waste deep-frying oil biodiesel to utilize waste frying oils (WFO) in clean energy production on the farm and determine the best engine loading stages to maximize engine efficiencies for different fuel blends and reduce the environmental impact of gas emissions from tractor diesel engines in the farms. The experiment design was factorial, with two factors, where the first was the engine load (0%, 25%, 50%, 75%, and 100%) and the second was fuel blend (0%, 5%, 20%, and 100% biodiesel), and the effects of loading stages and biodiesel percentage on engine performance indicators of engine speed, power take off torque, power take off power, brake power, brake mean effective pressure, brake thermal efficiency, brake specific fuel consumption, and gas emissions were studied. The experimental results indicated that engine load percentage and fuel blend percentage significantly affected all studied characters, and the best engine loading stages were between 25 and 75% to maximize engine efficiency and minimize the specific fuel consumption and gas emissions. Increasing the biodiesel percentage at all loading stages resulted decreasing in Engine brake power (BP), brake thermal efficiency, Power take-off (PTO) torque, and brake mean effective pressure and increases in brake specific fuel consumption. Increasing the engine load resulted in decreases in O2 emissions and increases in CO2, CO, NO, and SO2 emissions. Increasing the biodiesel percentage in the blended fuel samples resulted in increases in O2 and NO emissions and decreases in CO2, CO, and SO2 emissions. The use of biodiesel with diesel fuel reduces the environmental impact of gas emissions and decreases engine efficiency.

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