Energy and Exergy Based Analyses of a Multi-Fuelled SI Engine

2013 ◽  
Author(s):  
M. Z. Haq ◽  
A. Morshed
Keyword(s):  
Alternative Fuels ◽  
Engine Speed ◽  
Burning Velocity ◽  
Spark Ignition Engine ◽  
Si Engine ◽  
Engine Cylinder ◽  
Energy And Exergy ◽  
Si Engines ◽  
Exergy Analyses ◽  
Wiebe Function

The paper presents energy and exergy based analyses of a single cylinder, four-stroke, spark ignition engine fuelled by six different fuels namely iso-octane, methane, hydrogen, methanol, ethanol and n-butanol. Wiebe function is used to predict realistic burn rates. Since the Wiebe function parameters are generally optimized for conventional fuels, the current study modifies them for different alternative fuels using available burning velocity data. Heat losses throughout the cycle have been predicted by empirical correlations. Analyses are carried out to quantify energy and exergy of the premixed fuel-air mixture inside the engine cylinder at various phases of the cycle and some results obtained from the study are validated against data available in literature. Both energy and exergy destructions are found to be dependent on the fuels and engine operating parameters. Results show that at 1000 rpm, about 34–39% of energy contained in the fuel is converted into useful work and this quantity is found to increase with engine speed. Exergies associated with exhaust are found significantly lower than the corresponding energy values for all fuels. The present study highlights the necessity of both energy and exergy analyses to probe and identify the sources of work potential losses in SI engines in various phases of the cycle.

Numerical Simulations of a Hydrogen-Enriched Methane Fueled Spark Ignition Engine

2004 ◽  
Author(s):  
V. Matham ◽  
K. Majmudar ◽  
K. Aung
Keyword(s):  
Numerical Simulations ◽  
Alternative Fuels ◽  
Engine Speed ◽  
Current Model ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Ignition Timing ◽  
Si Engine ◽  
Gaseous Fuels ◽  
Si Engines

The use of alternative fuels such as natural gas (methane) in spark-ignition (SI) engines is beneficial to the environment as it reduces emissions of pollutants such as NOx from these engines with slight penalty on the performance. This paper investigated the use of methane and hydrogen/methane mixtures in an SI engine by numerical simulations. The numerical simulations were based on the models of finite heat release, cylinder heat transfer, pumping losses, and friction losses. Simulations were carried out to evaluate the effects of compression ratio, equivalence ratio, ignition timing, and engine speed on the performance of the SI engine. The results showed that the current model could satisfactorily predict the performance of an SI engine fueled by gaseous fuels.

scholarly journals Efficiency characteristics of a new quasi-constant volume combustion spark ignition engine

2013 ◽  
Vol 17 (1) ◽  
pp. 119-133 ◽  
Author(s):  
Jovan Doric ◽  
Ivan Klinar
Keyword(s):  
Engine Speed ◽  
Combustion Process ◽  
Spark Ignition ◽  
Constant Volume ◽  
Spark Ignition Engine ◽  
Si Engine ◽  
Piston Mechanism ◽  
Si Engines ◽  
Ic Engines ◽  
Engine Concept

A zero dimensional model has been used to investigate the combustion performance of a four cylinder petrol engine with unconventional piston motion. The main feature of this new spark ignition (SI) engine concept is the realization of quasi-constant volume (QCV) during combustion process. Presented mechanism is designed to obtain a specific motion law which provides better fuel consumption of internal combustion (IC) engines. These advantages over standard engine are achieved through synthesis of unconventional piston mechanism. The numerical calculation was performed for several cases of different piston mechanism parameters, compression ratio and engine speed. Calculated efficiency and power diagrams are plotted and compared with performance of ordinary SI engine. The results show that combustion during quasi-constant volume has significant impact on improvement of efficiency. The main aim of this paper is to find a proper kinematics parameter of unconventional piston mechanism for most efficient heat addition in SI engines.

Numerical Simulation of a Spark Ignition Engine Using Liquid Fuels and Liquid Fuel Blends

2003 ◽  
Author(s):  
K. Majmudar ◽  
K. Aung
Keyword(s):  
Numerical Simulations ◽  
Liquid Fuel ◽  
Alternative Fuels ◽  
Current Model ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Liquid Fuels ◽  
Si Engine ◽  
Fuel Blends ◽  
Si Engines

The use of alternative fuels such as methanol and ethanol in spark-ignition (SI) engines is beneficial to the environment as it reduces emissions of pollutants such as NOx from these engines with slight penalty on the performance. This paper investigated the use of liquid fuel blends such as ethanol/gasoline blend in an SI engine by numerical simulations. The numerical simulations were based on the models of finite heat release, cylinder heat transfer, pumping losses, and friction losses. Simulations were carried out to evaluate the effects of compression ratio, equivalence ratio, ignition timing, and engine speed on the performance of the SI engine. The results of the simulations were compared with experimental data from the literature to validate the simulations. Good agreements between the computed and experimental results were obtained. The results showed that the current model could satisfactorily predict the performance of an SI engine fueled by liquid fuel blends.

Thermodynamic Analysis of a Multi-Fueled Single Cylinder SI Engine

2011 ◽  
Author(s):  
M. Z. Haq ◽  
M. R. Mohiuddin
Keyword(s):  
Thermodynamic Analysis ◽  
Chemical Properties ◽  
Second Law Of Thermodynamics ◽  
Second Law ◽  
Si Engine ◽  
Gaseous Species ◽  
Single Cylinder ◽  
Engine Cylinder ◽  
Si Engines

The paper presents a thermodynamic analysis of a single cylinder four-stroke spark-ignition (SI) engine fuelled by four fuels namely iso-octane, methane, methanol and hydrogen. In SI engines, due to phenomena like ignition delay and finite flame speed manifested by the fuels, the heat addition process is not instantaneous, and hence ‘Weibe function’ is used to address the realistic heat release scenario of the engine. Empirical correlations are used to predict the heat loss from the engine cylinder. Physical states and chemical properties of gaseous species present inside the cylinder are determined using first and second law of thermodynamics, chemical kinetics, JANAF thermodynamic data-base and NASA polynomials. The model is implemented in FORTRAN 95 using standard numerical routines and some simulation results are validated against data available in literature. The second law of thermodynamics is applied to estimate the change of exergy i.e. the work potential or quality of the in-cylinder mixture undergoing various phases to complete the cycle. Results indicate that, around 4 to 24% of exergy initially possessed by the in-cylinder mixture is reduced during combustion and about 26 to 42% is left unused and exhausted to the atmosphere.

scholarly journals The influence of exhaust system leak on the operating parameters of a turbocharged spark ignition engine

2018 ◽  
Vol 19 (6) ◽  
pp. 468-472
Author(s):  
Krystian Hennek ◽  
Mariusz Graba
Keyword(s):  
Oxygen Sensor ◽  
Combustion Engine ◽  
Exhaust System ◽  
Spark Ignition Engine ◽  
Si Engine ◽  
The Road ◽  
Torque Measurements ◽  
Si Engines ◽  
Common Technique ◽  
On The Road

Turbocharging of an internal combustion engine is the most common technique to improve an engines’ performance. In present it is not hard to meet vehicles on the road with turbocharged SI engines, which have a high mileage, and because of this fact there is a high risk of exhaust systems leak. This might have its influence not only on the emissions, but also on the vehicles performance. Thereby this dissertation shows the comparative analysis of the influence of exhaust system leak in the catalyzer input on the exhaust gasses composition in the catalyzer output and the operation parameters of an turbocharged SI engine. During the research some parameters were recorded and compared, e. g.: the engines power and torque, the injec-tors opening time, the oxygen sensors voltage signals in the input and in the output of the catalyzer, the concentration of harmful gasses in the exhaust tailpipe. The research was conducted with the use of a single roller MAHA MSR 500 chassis dynamometer. A series of torque measurements was performed. Under these measurements a simulation of the exhaust system leakage of a turbocharged SI passenger car engine was made. As a result three variations of the wideband oxygen sensor acting were reached. The wideband sensor is mounted between the turbocharger unit and the input of the catalyzer. In the test the influence of the leakage on the injector’s opening time and the composition of harmful exhaust substances were pointed.

One-Dimensional Simulation of the Combustion Process in an Engine Cylinder with Ethanol

2014 ◽  
Vol 660 ◽  
pp. 447-451
Author(s):  
Akasyah M. Kathri ◽  
Rizalman Mamat ◽  
Amir Aziz ◽  
Azri Alias ◽  
Nik Rosli Abdullah
Keyword(s):  
Diesel Engine ◽  
Alternative Fuels ◽  
Engine Speed ◽  
Combustion Process ◽  
Cylinder Pressure ◽  
Ethanol Fuel ◽  
One Dimensional ◽  
Engine Cylinder ◽  
Dimensional Simulation ◽  
The One

The diesel engine is one of the most important engines for road vehicles. The engine nowadays operates with different kinds of alternative fuels, such as natural gas and biofuel. The aim of this article is to study the combustion process that occurs in an engine cylinder of a diesel engine when using biofuel. The one-dimensional numerical analysis using GT-Power software is used to simulate the commercial four-cylinder diesel engine. The engine operated at high engine load and speed. The ethanol fuel used in the simulation is derived from the conventional ethanol fuel properties. The analysis of simulations includes the cylinder pressure, combustion temperature and rate of heat release. The simulation results show that in-cylinder pressure and temperature for ethanol is higher than for diesel at any engine speed. However, the mass fraction of ethanol burned is similar to that of diesel. MFB only affects the engine speed.

Energy and exergy analyses of a hydrogen fueled SI engine: Effect of ignition timing and compression ratio

Energy ◽  
2019 ◽  
Vol 175 ◽  
pp. 410-422 ◽  
Author(s):  
Yasin Şöhret ◽  
Habib Gürbüz ◽  
İsmail Hakkı Akçay
Keyword(s):  
Compression Ratio ◽  
Ignition Timing ◽  
Si Engine ◽  
Energy And Exergy ◽  
Exergy Analyses

The Lean Mixture Operational Limits of a Spark Ignition Engine When Operated on Fuel Mixtures

2008 ◽  
Vol 131 (1) ◽  
Author(s):  
Hailin Li ◽  
Ghazi A. Karim ◽  
A. Sohrabi
Keyword(s):  
Engine Performance ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Si Engine ◽  
Lean Mixture ◽  
Si Engines ◽  
Unstable Combustion ◽  
Fuel Mixtures ◽  
Traditional Approaches ◽  
Combustion Processes

The operation of spark ignition (SI) engines on lean mixtures is attractive, in principle, since it can provide improved fuel economy, reduced tendency to knock, and extremely low NOx emissions. However, the associated flame propagation rates become degraded significantly and drop sharply as the operating mixture is made increasingly leaner. Consequently, there exist distinct operational lean mixture limits beyond which satisfactory engine performance cannot be maintained due to the resulting prolonged and unstable combustion processes. This paper presents experimental data obtained in a single cylinder, variable compression ratio, SI engine when operated in turn on methane, hydrogen, carbon monoxide, gasoline, iso-octane, and some of their binary mixtures. A quantitative approach for determining the operational limits of SI engines is proposed. The lean limits thus derived are compared and validated against the corresponding experimental results obtained using more traditional approaches. On this basis, the dependence of the values of the lean mixture operational limits on the composition of the fuel mixtures is investigated and discussed. The operational limit for throttled operation with methane as the fuel is also established.

Energy and exergy analyses of a spark-ignition engine

2010 ◽  
Vol 7 (5) ◽  
pp. 547 ◽  
Author(s):  
M. Ameri ◽  
F. Kiaahmadi ◽  
M. Khanaki ◽  
M. Nazoktabar
Keyword(s):  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Energy And Exergy ◽  
Exergy Analyses

A Comparative Study of the Performance of a SI Engine Fuelled by Natural Gas as Alternative Fuel by Thermodynamic Simulation

2009 ◽  
Author(s):  
Mehrnoosh Dashti ◽  
Ali Asghar Hamidi ◽  
Ali Asghar Mozafari
Keyword(s):  
Experimental Data ◽  
Natural Gas ◽  
Thermal Efficiency ◽  
Alternative Fuels ◽  
Thermodynamic Simulation ◽  
Internal Combustion ◽  
Alternative Fuel ◽  
Spark Ignition Engine ◽  
Solution Temperature ◽  
Si Engine

With the declining energy resources and increase of pollutant emissions, a great deal of efforts has been focused on the development of alternatives for fossil fuels. One of the promising alternative fuels to gasoline in the internal combustion engine is natural gas [1–5]. The application of natural gas in current internal combustion engines is realistic due to its many benefits. The higher thermal efficiency due to the higher octane value and lower exhaust emissions including CO2 as a result of the lower carbon to hydrogen ratio of the fuel are the two important feature of using CNG as an alternative fuel. It is well known that computer simulation codes are valuable economically as a cost effective tool for design and analysis of the engine operations. In the present work the use of an exiting spark ignition engine to run on both gasoline and CNG is evaluated by thermodynamic simulation of the engine cycle. The stepwise calculations for pressure and temperature of the cylinder at compression process, ignition delay time, combustion and expansion processes have been considered. The first law of thermodynamics is applied for all steps and Newton-Raphson method is used for the numerical solution. Temperature dependent specific heat capacity and as a result specific enthalpy, entropy, internal energy and specific Gibbs functions are calculated in each step. Two zones model for the combustion process simulation has been used and the mass burning rate is predicted by considering the propagation of the flame front spherically. The performance characteristics including power, IMEP, ISFC, thermal efficiency and emissions concentration of SI engine on both gasoline and CNG fuel are determined by the model. In order to validate the model, the results are compared with the corresponding experimental data. It is found that the simulated results show reasonable agreement with the experimental data.

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