Theoretical study of the effects of pilot fuel quantity and its injection timing on the performance and emissions of a dual fuel diesel engine

2007 ◽  
Vol 48 (11) ◽  
pp. 2951-2961 ◽  
Author(s):  
R.G. Papagiannakis ◽  
D.T. Hountalas ◽  
C.D. Rakopoulos
Keyword(s):  
Diesel Engine ◽  
Theoretical Study ◽  
Dual Fuel ◽  
Injection Timing ◽  
Performance And Emissions ◽  
Pilot Fuel

Improving the Performance of a Biogas Powered Dual Fuel Diesel Engine Using Emulsified Rice Bran Biodiesel as Pilot Fuel Through Adjustment of Compression Ratio and Injection Timing

2015 ◽  
Vol 137 (9) ◽  
Author(s):  
Bhaskor J. Bora ◽  
Ujjwal K. Saha
Keyword(s):  
Diesel Engine ◽  
Rice Bran ◽  
Compression Ratio ◽  
Droplet Diameter ◽  
Dual Fuel ◽  
Injection Timing ◽  
Two Phase ◽  
Water Emulsion ◽  
Hydrophilic Lipophilic Balance ◽  
Pilot Fuel

Emulsification is one of the proven techniques to control the pollutants of the diesel engines. The present work attempts to explore the effect of injection timing (IT) of pilot fuel and compression ratio (CR) for an emulsified rice bran biodiesel (RBB)–biogas powered dual fuel diesel engine. A two-phase stable water emulsion of rice bran methyl ester has been prepared by optimizing the factors such as water content (5% and 10%), surfactants (3%), and hydrophilic lipophilic balance (HLB) values (4.3, 5, and 6). The stability of the emulsions is determined on the basis of measurement of mean droplet diameter and stability test. For experimentation, a 3.5 kW single cylinder, direct injection (DI), water cooled, variable CR diesel engine is converted into a biogas run dual fuel diesel engine by connecting a venturi gas mixer at the inlet manifold. A set of combinations comprising CRs of 18, 17.5, and 17, and ITs of 23 deg, 26 deg, 29 deg, and 32 deg before top dead centers (BTDC) at different loading conditions are considered. The investigation demonstrates a maximum brake thermal efficiency (BTE) of 23.62% along with a liquid fuel replacement of 82.22% at pilot fuel IT of 29 deg BTDC and CR of 18. For the same combination, CO and HC emissions are found to be least in all the test cases.

To Study the Effects of (Compressed Natural Gas + Diesel) Under Dual Fuel Mode on Engine Performance and Emissions Characteristic

2020 ◽  
Vol 18 (2) ◽  
pp. 108-112
Author(s):  
Ashok Kumar ◽  
Piyushi Nautiyal ◽  
Kamalasish Dev
Keyword(s):  
Diesel Engine ◽  
Natural Gas ◽  
Engine Performance ◽  
Experimental Results ◽  
Dual Fuel ◽  
Compressed Natural Gas ◽  
Performance And Emissions ◽  
Pilot Fuel ◽  
Energy Share ◽  
Engine Performance And Emissions

The present study is investigated on the performance and emissions characteristics of a diesel engine fuelled by compressed natural gas and base diesel (CNG + Diesel). The CNG fuels used as the primary fuel, and diesel as pilot fuel under dual-fuel mode. The pilot fuel is partially replaced by CNG at a different percentage. The primary fuel is injected into the engine with intake air during the suction stroke. The experimental results reveal the effect of CNG + diesel under dual fuel mode on BTE, BSFC, CO, CO2, HC, NOx and Smoke. It is observed from the experimental results that CO2, NOx and Smoke emissions decreased but HC and CO emissions increase with an increase in CNG energy share.

Studies on Esters of Coconut Oil as Fuel for LPG-Biodiesel Dual Fuel Engine

2003 ◽  
Author(s):  
N. Kapilan ◽  
R. P. Reddy ◽  
P. Mohanan
Keyword(s):  
Diesel Engine ◽  
Coconut Oil ◽  
Poor Performance ◽  
Dual Fuel ◽  
Injection Timing ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Performance And Emission ◽  
Mode Operation ◽  
Pilot Fuel

The rapid depletion in world petroleum reserves and uncertainty in petroleum supply due to political and economical reasons, as well as, the sharp escalation in the petroleum prices, have stimulated the search for alternatives to petroleum based fuels specially diesel and gasoline. Biodiesel is one of the renewable fuels, which will be the good replacement to diesel. But as a sole fuel, it gives poor performance and higher emissions. From the literature survey, it is observed that not much work has been done to use Methyl Ester (ME) of coconut oil as liquid fuel in sole and dual fuel mode of operation. Hence, in the present work, ME of coconut oil is chosen as a sole fuel to run the diesel engine and an alternative pilot fuel to run LPG-Biodiesel dual fuel engine. In dual fuel mode operation, LPG is used as the inducted gaseous fuel. LPG has been chosen as the inducted fuel on account of its easy availability in abundance in the present time. The existing compression ignition diesel engine was modified to work on dual fuel mode. Tests were carried out on a single cylinder, four strokes, water-cooled, direct injection, compression ignition engine using ME of coconut oil as fuel. To study the effect of injection timing, its is advanced and retarded from the standard injection timing recommended for diesel operation. From the results, it is observed that the advanced injection timing results in better performance and lower emissions of the diesel engine. In dual fuel mode operation, first the engine was started with ME of coconut oil as fuel and then the LPG flow rate was increased. With appropriate proportions of the injected (0.45, 0.65 and 0.75 kg/hr) and inducted fuels it is possible to improve the engine performance and reduce its emissions. From the experimental results, it is found that the pilot fuel rate of 0.65 kg/hr is preferred from the point view of brake thermal efficiency, fuel consumption and smooth running. ME of coconut oil were successfully used as sole fuel and pilot fuel. The performance and emission of the engine in sole fuel mode with better injection timing and dual fuel mode with better pilot quantity were compared. From the comparison, it is observed that the ME of coconut oil can be used as pilot fuel in dual fuel engine compared to sole fuel with regard to performance and emissions.

On the Attainment of Optimum Injection Timing of Pilot Fuel in a Dual Fuel Diesel Engine Run on Biogas

2014 ◽  
Author(s):  
Bhaskor J. Bora ◽  
Ujjwal K. Saha
Keyword(s):  
Diesel Engine ◽  
Fossil Fuels ◽  
Engine Performance ◽  
Biomass Energy ◽  
Dual Fuel ◽  
Injection Timing ◽  
Operational Parameters ◽  
Performance And Emission ◽  
Pilot Fuel ◽  
Immense Potential

The race among the different nations to attain supremacy has given rise to twin crisis: depletion of fossil fuel reserves and degradation of environment. Every nation wants to increase the per capita income by producing more power. In order to achieve this feat, each nation has to burn huge amounts of fossil fuels causing an increase in the emission of greenhouse gases. In this regard, renewable energy can be a panacea to the above mentioned problems. Biogas, one form of biomass energy, has an immense potential as a renewable fuel. This biogas can be used successfully in diesel engines for the generation of power. However, in order to achieve an optimum efficiency, the operating parameters of the biogas run dual fuel engine have to be standardized. In such an engine, injection timing of the pilot fuel is one of the important operational parameters that greatly affects the engine performance. In view of this, in the present paper, an attempt has been made to standardize the injection timing of pilot fuel a biogas run dual fuel diesel engine on the basis of its performance and emission characteristics of. Experimental investigation demonstrates an improvement in efficiency and a reduction in emissions at the injection timing of 29° before top dead centre.

Estimating the Theoretical Performance Limits of a Biogas Powered Dual Fuel Diesel Engine Using Emulsified Rice Bran Biodiesel as Pilot Fuel

2015 ◽  
Vol 138 (2) ◽  
Author(s):  
Bhaskor J. Bora ◽  
Ujjwal K. Saha
Keyword(s):  
Diesel Engine ◽  
Rice Bran ◽  
Entropy Generation Rate ◽  
Dual Fuel ◽  
Injection Timing ◽  
Exhaust Gas ◽  
Emission Analysis ◽  
Water Emulsion ◽  
Energy And Exergy ◽  
Pilot Fuel

The present study is an attempt to estimate the energy and the exergy potential of a biogas run dual fuel diesel engine using emulsified rice bran biodiesel (RBB) as pilot fuel at varying compression ratio (CR) and injection timing (IT). The objective is to arrive at an optimum setting of the engine based on dual fuel characteristics using energy and exergy analysis. The pilot fuel considered for this study is a two-phase stable water emulsion of RBB having water content (5%), surfactants (3%), and hydrophilic lipophilic balance value of 6. For experimentation, a 3.5 kW single cylinder, direct injection (DI), natural aspirated water-cooled, variable CR (VCR) diesel engine is converted into a dual fuel engine. Experiments are conducted for 12 different combinations of CR of 18, 17.5, and 17 and IT of 23 deg, 26 deg, 29 deg, and 32 deg bottom top dead center (BTDC) at full load conditions of brake mean effective pressure (BMEP) of 4.24 bar. The parameters analyzed are the energy and exergy potential of fuel input, shaft work, cooling water, exhaust gas, exergy destruction, peak cylinder pressure (PCP), peak heat release rate (PHRR), brake thermal efficiency (BTE), exergy efficiency, exhaust gas temperature (EGT), entropy generation rate, and emission analysis. The results indicate that the combination of CR = 18 and IT = 29 deg BTDC gives a better thermodynamic performance for this particular range of the operating parameters for a raw biogas run dual fuel diesel engine using emulsified RBB as pilot fuel.

Discussion on the combustion, performance and emissions of a dual fuel diesel engine fuelled with methanol-based CeO2 nanofluids

Fuel ◽  
2021 ◽  
Vol 302 ◽  
pp. 121096
Author(s):  
Suozhu Pan ◽  
Jiangjun Wei ◽  
Changfa Tao ◽  
Gang Lv ◽  
Yejian Qian ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Dual Fuel ◽  
Combustion Performance ◽  
Performance And Emissions

A phenomenological combustion analysis of a dual-fuel natural-gas diesel engine

2016 ◽  
Vol 231 (1) ◽  
pp. 66-83 ◽  
Author(s):  
Shuonan Xu ◽  
David Anderson ◽  
Mark Hoffman ◽  
Robert Prucka ◽  
Zoran Filipi
Keyword(s):  
Diesel Engine ◽  
Natural Gas ◽  
Heat Release ◽  
Diesel Fuel ◽  
Fuel Injection ◽  
Dual Fuel ◽  
Injection Timing ◽  
Heavy Duty ◽  
Engine System ◽  
Wiebe Function

Energy security concerns and an abundant supply of natural gas in the USA provide the impetus for engine designers to consider alternative gaseous fuels in the existing engines. The dual-fuel natural-gas diesel engine concept is attractive because of the minimal design changes, the ability to preserve a high compression ratio of the baseline diesel, and the lack of range anxiety. However, the increased complexity of a dual-fuel engine poses challenges, including the knock limit at a high load, the combustion instability at a low load, and the transient response of an engine with directly injected diesel fuel and port fuel injection of compressed natural gas upstream of the intake manifold. Predictive simulations of the complete engine system are an invaluable tool for investigations of these conditions and development of dual-fuel control strategies. This paper presents the development of a phenomenological combustion model of a heavy-duty dual-fuel engine, aided by insights from experimental data. Heat release analysis is carried out first, using the cylinder pressure data acquired with both diesel-only and dual-fuel (diesel and natural gas) combustion over a wide operating range. A diesel injection timing correlation based on the injector solenoid valve pulse widths is developed, enabling the diesel fuel start of injection to be detected without extra sensors on the fuel injection cam. The experimental heat release trends are obtained with a hybrid triple-Wiebe function for both diesel-only operation and dual-fuel operation. The ignition delay period of dual-fuel operation is examined and estimated with a predictive correlation using the concept of a pseudo-diesel equivalence ratio. A four-stage combustion mechanism is discussed, and it is shown that a triple-Wiebe function has the ability to represent all stages of dual-fuel combustion. This creates a critical building block for modeling a heavy-duty dual-fuel turbocharged engine system.

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