Optimisation of injection timing and compression ratio of a raw biogas powered dual fuel diesel engine

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.

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Theoretical Performance Limits of a Biogas–Diesel Powered Dual Fuel Diesel Engine for Different Combinations of Compression Ratio and Injection Timing

Journal of Energy Engineering ◽

10.1061/(asce)ey.1943-7897.0000293 ◽

2016 ◽

Vol 142 (2) ◽

Cited By ~ 6

Author(s):

Bhaskor J. Bora ◽

Ujjwal K. Saha

Keyword(s):

Diesel Engine ◽

Compression Ratio ◽

Dual Fuel ◽

Injection Timing ◽

Performance Limits ◽

Theoretical Performance

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Optimization of compression ratio and injection timing of a diesel engine Fueled with oxygenated blends using fuzzy logic-based Taguchi method

Energy Sources Part A Recovery Utilization and Environmental Effects ◽

10.1080/15567036.2020.1871123 ◽

2021 ◽

pp. 1-21

Author(s):

Ramesh Kumar Chidambaram ◽

Ankit Sonthalia ◽

Gopal Poornananadan ◽

Edwin Geo Varuvel ◽

Thiyagarajan Subramanian

Keyword(s):

Fuzzy Logic ◽

Diesel Engine ◽

Taguchi Method ◽

Compression Ratio ◽

Injection Timing

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

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1177/0954407016633337 ◽

2016 ◽

Vol 231 (1) ◽

pp. 66-83 ◽

Cited By ~ 13

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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Effect of Fuel Injection Timing and Elevated Intake Air Temperature on the Combustion and Emission Characteristics of Dual Fuel Operated Diesel Engine

Procedia Engineering ◽

10.1016/j.proeng.2013.09.198 ◽

2013 ◽

Vol 64 ◽

pp. 1191-1198 ◽

Cited By ~ 18

Author(s):

K. Senthil Kumar ◽

R. Thundil Karuppa Raj

Keyword(s):

Diesel Engine ◽

Air Temperature ◽

Fuel Injection ◽

Dual Fuel ◽

Injection Timing ◽

Emission Characteristics ◽

Fuel Injection Timing

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Modification of a Direct Injection Diesel Engine in Improving the Ignitability and Emissions of Diesel–Ethanol–Palm Oil Methyl Ester Blends

Energies ◽

10.3390/en12142644 ◽

2019 ◽

Vol 12 (14) ◽

pp. 2644 ◽

Cited By ~ 1

Author(s):

Norhidayah Mat Taib ◽

Mohd Radzi Abu Mansor ◽

Wan Mohd Faizal Wan Mahmood

Keyword(s):

Diesel Engine ◽

Methyl Ester ◽

Ambient Temperature ◽

Palm Oil ◽

Compression Ratio ◽

Direct Injection ◽

Cetane Number ◽

Engine Performance ◽

Injection Timing ◽

Injection Strategies

Blending diesel with biofuels, such as ethanol and palm oil methyl ester (PME), enhances the fuel properties and produces improved engine performance and low emissions. However, the presence of ethanol, which has a small cetane number and low heating value, reduces the fuel ignitability. This work aimed to study the effect of injection strategies, compression ratio (CR), and air intake temperature (Ti) modification on blend ignitability, combustion characteristics, and emissions. Moreover, the best composition of diesel–ethanol–PME blends and engine modification was selected. A simulation was also conducted using Converge CFD software based on a single-cylinder direct injection compression ignition Yanmar TF90 engine parameter. Diesel–ethanol–PME blends that consist of 10% ethanol with 40% PME (D50E10B40), D50E25B25, and D50E40B10 were selected and conducted on different injection strategies, compression ratios, and intake temperatures. The results show that shortening the injection duration and increasing the injected mass has no significant effect on ignition. Meanwhile, advancing the injection timing improves the ignitability but with weak ignition energy. Therefore, increasing the compression ratio and ambient temperature helps ignite the non-combustible blends due to the high temperature and pressure. This modification allowed the mixture to ignite with a minimum CR of 20 and Ti of 350 K. Thus, blending high ethanol contents in a diesel engine can be applied by advancing the injection, increasing the CR, and increasing the ambient temperature. From the emission comparison, the most suitable mixtures that can be operated in the engine without modification is D50E25B25, and the most appropriate modification on the engine is by increasing the ambient temperature at 350 K.

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Hydrogen Injection in a Dual Fuel Engine Fueled with Low-Pressure Injection of Methyl Ester of Thevetia Peruviana (METP) for Diesel Engine Maintenance Application

Energies ◽

10.3390/en13215663 ◽

2020 ◽

Vol 13 (21) ◽

pp. 5663 ◽

Cited By ~ 1

Author(s):

Mahantesh Marikatti ◽

N. R. Banapurmath ◽

V. S. Yaliwal ◽

Y.H. Basavarajappa ◽

Manzoore Elahi M Soudagar ◽

...

Keyword(s):

Diesel Engine ◽

Methyl Ester ◽

Gas Flow ◽

Engine Performance ◽

Gaseous Fuel ◽

Dual Fuel ◽

Injection Timing ◽

Thevetia Peruviana ◽

Oil Source ◽

Engine Maintenance

The present work is mapped to scrutinize the consequence of biodiesel and gaseous fuel properties, and their impact on compression-ignition (CI) engine combustion and emission characteristics in single and dual fuel operation. Biodiesel prepared from non-edible oil source derived from Thevetia peruviana belonging to the plant family of Apocynaceaeis. The fuel has been referred as methyl ester of Thevetia peruviana (METP) and adopted as pilot fuel for the effective combustion of compressed gaseous fuel of hydrogen. This investigation is an effort to augment the engine performance of a biodiesel-gaseous fueled diesel engine operated under varied engine parameters. Subsequently, consequences of gas flow rate, injection timing, gas entry type, and manifold gas injection on the modified dual-fuel engine using conventional mechanical fuel injections (CMFIS) for optimum engine performance were investigated. Fuel consumption, CO, UHC, and smoke formations are spotted to be less besides higher NOx emissions compared to CMFIS operation. The fuel burning features such as ignition delay, burning interval, and variation of pressure and heat release rates with crank angle are scrutinized and compared with base fuel. Sustained research in this direction can convey practical engine technology, concerning fuel combinations in the dual fuel mode, paving the way to alternatives which counter the continued fossil fuel utilization that has detrimental impacts on the climate.

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