Combustion in Gas Fueled Compression: Ignition Engines of the Dual Fuel Type

2003 ◽  
Vol 125 (3) ◽  
pp. 827-836 ◽  
Author(s):  
G. A. Karim
Keyword(s):  
Liquid Fuel ◽  
Combustion Process ◽  
Gaseous Fuel ◽  
Dual Fuel ◽  
Spark Ignition Engines ◽  
Complex Processes ◽  
Compression Ignition Engines ◽  
Operational Characteristics ◽  
Dual Fuel Engines ◽  
Gas Fueled

In the dual fuel engine much of the energy release comes from the combustion of the gaseous fuel while only a small amount of diesel liquid fuel provides ignition through timed cylinder injection. Such operation with optimum conversion methods has the potential to provide operational characteristics that are comparable or superior to those of the corresponding diesel or spark ignition engines. These characteristics may be realized only if sufficiently effective measures can be ensured both for the avoidance of knock, usually at high loads, and incomplete gaseous fuel utilization at relatively light loads. An objective of this contribution is to demonstrate that the main effort needed to overcome the problems associated with the operation of gas fueled dual fuel engines is via a better control of the relatively complex processes of combustion. Both experimental and analytical modeling procedures for effecting optimum improvement to the combustion process are described.

Combustion Quasi-Two Zone Predictive Model for Dual Fuel Engines

1999 ◽  
Author(s):  
G. H. Abd Alla ◽  
H. A. Soliman ◽  
O. A. Badr ◽  
M. F. Abd Rabbo
Keyword(s):  
Predictive Model ◽  
Combustion Process ◽  
Chemical Species ◽  
Kinetic Scheme ◽  
Chemical Kinetic ◽  
Operating Conditions ◽  
Gaseous Fuel ◽  
Combustion Model ◽  
Dual Fuel ◽  
Dual Fuel Engines

Abstract A quasi-two zone predictive model developed in the present work for the prediction of the combustion processes in dual fuel engines and some of their performance features. Methane is used as the main fuel while employing a small quantity of liquid fuel (pilot) injected through the conventional diesel fuel system. This model emphasizes the effects of chemical kinetics activity of the premixed gaseous fuel on the combustion performance, while the role of the pilot fuel in the ignition and heat release processes is considered. A detailed chemical kinetic scheme consists of 178 elementary reaction steps and 41 chemical species is employed to describe the oxidation of the gaseous fuel from the start of compression to the end of expansion process. The associated formation and concentrations of exhaust emissions are correspondingly established. This combustion model is able to establish the development of the combustion process with time and the associated important operating parameters such as pressure, temperature, rates of energy release and composition. Predicted values for methane operation show good agreement with corresponding previous experimental values over a range of operating conditions mainly associated with high load operation.

scholarly journals ECU calibration for gaseous dual fuel supply system in compression ignition engines

2020 ◽  
Vol 182 (3) ◽  
pp. 33-37
Author(s):  
Denys Stepanenko ◽  
Zbigniew Kneba
Keyword(s):  
Electronic Control Unit ◽  
Engine Performance ◽  
Control Unit ◽  
Primary Energy ◽  
Gaseous Fuel ◽  
Dual Fuel ◽  
Combustion Mode ◽  
Compression Ignition Engines ◽  
Engine Wear ◽  
Dual Fuel Engines

The dual fuel (DF) combustion mode is proven solution that allows to improve or get at the same level engine performance and reduce toxic compounds in exhaust gases which is confirmed by researchers and end-users. DF combustion mode uses two fuels gaseous fuel as a primary energy source and a pilot quantity of diesel fuel as ignition source. However, in order, to fully take advantage of the potential of the dual fuel mode, DF system must be proper calibrated. Despite the existence of commercial control systems for dual fuel engines on the market, the literature on the important parameters for the engine's operation introduced during calibration is scarce. This article briefly describes a concept of working algorithm and calibration strategy of a dual fuel electronic control unit (ECU) The purpose of calibration is to achieve the greatest possible use of an alternative gaseous fuel without causing accelerated engine wear.

scholarly journals Numerical Study of Engine Performance and Emissions for Port Injection of Ammonia into a Gasoline\Ethanol Dual-Fuel Spark Ignition Engine

2021 ◽  
Vol 11 (4) ◽  
pp. 1441
Author(s):  
Farhad Salek ◽  
Meisam Babaie ◽  
Amin Shakeri ◽  
Seyed Vahid Hosseini ◽  
Timothy Bodisco ◽  
...  
Keyword(s):  
Numerical Study ◽  
Combustion Process ◽  
Engine Performance ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Combustion Model ◽  
Dual Fuel ◽  
Spark Ignition Engines ◽  
Performance And Emissions ◽  
Hc Emissions

This study aims to investigate the effect of the port injection of ammonia on performance, knock and NOx emission across a range of engine speeds in a gasoline/ethanol dual-fuel engine. An experimentally validated numerical model of a naturally aspirated spark-ignition (SI) engine was developed in AVL BOOST for the purpose of this investigation. The vibe two zone combustion model, which is widely used for the mathematical modeling of spark-ignition engines is employed for the numerical analysis of the combustion process. A significant reduction of ~50% in NOx emissions was observed across the engine speed range. However, the port injection of ammonia imposed some negative impacts on engine equivalent BSFC, CO and HC emissions, increasing these parameters by 3%, 30% and 21%, respectively, at the 10% ammonia injection ratio. Additionally, the minimum octane number of primary fuel required to prevent knock was reduced by up to 3.6% by adding ammonia between 5 and 10%. All in all, the injection of ammonia inside a bio-fueled engine could make it robust and produce less NOx, while having some undesirable effects on BSFC, CO and HC emissions.

Enhancement of the combustion process in dual-fuel engines at part loads using exhaust gas recirculation

2007 ◽  
Vol 221 (7) ◽  
pp. 877-888 ◽  
Author(s):  
V Pirouzpanah ◽  
R Khoshbakhti Saray
Keyword(s):  
Chemical Kinetics ◽  
Combustion Process ◽  
Exhaust Gas Recirculation ◽  
Operating Conditions ◽  
Combustion Model ◽  
Dual Fuel ◽  
Exhaust Gas ◽  
Performance And Emission ◽  
Dual Fuel Engines ◽  
Gas Recirculation

Dual-fuel engines at part loads inevitably suffer from lower thermal efficiency and higher carbon monoxide and unburned fuel emission. The present work was carried out to investigate the combustion characteristics of a dual-fuel (diesel-gas) engine at part loads, using a single-zone combustion model with detailed chemical kinetics for combustion of natural gas fuel. The authors have developed software in which the pilot fuel is considered as a subsidiary zone and a heat source derived from two superimposedWiebe combustion functions to account for its contribution to ignition of the gaseous fuel and the rest of the total released energy. The chemical kinetics mechanism consists of 112 reactions with 34 species. This quasi-two-zone combustion model is able to establish the development of the combustion process with time and the associated important operating parameters, such as pressure, temperature, heat release rate (HRR), and species concentration. Therefore, this paper describes an attempt to investigate the combustion phenomenon at part loads and using hot exhaust gas recirculation (EGR) to improve the above-mentioned drawbacks and problems. By employing this technique, it is found that lower percentages of EGR and allowance for its thermal and radical effects have a positive influence on performance and emission parameters of dual-fuel engines at part loads. Predicted values show good agreement with corresponding experimental values under special engine operating conditions (quarter-load, 1400 r/min). Implications are discussed in detail.

scholarly journals Effect of CO2 content in CNG on the combustion process in a dual-fuel compression ignition engine

2015 ◽  
Vol 162 (3) ◽  
pp. 91-101
Author(s):  
Sławomir WIERZBICKI ◽  
Maciej MIKULSKI ◽  
Michał ŚMIEJA
Keyword(s):  
Combustion Process ◽  
Gaseous Fuel ◽  
Dual Fuel ◽  
Combustion Engines ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Toxic Compounds ◽  
Alternative Sources ◽  
Effective Use ◽  
And Control

Seeking alternative sources of energy for its more effective use, reducing emissions of toxic pollutants to the atmosphere and counteracting global warming are nowadays the major areas of development in the power industry, including the design of combustion engines. Currently, the research into the use of new fuels, which may be effective sources of energy, is performed by many scientific centres. The use of biogas for production of energy in cogeneration systems is one of the ways for improvement of energy balance. In the research described herein, a dual-fuel compression ignition engine was fuelled with gaseous fuel with variable CNG and CO2 ratios. The tests were performed for engine fuelling controlled by both an original controller with the software optimised for single-fuel operation and for the injection of a pilot dose of diesel controlled by a dedicated controller enabling the adjustment and control of the injection and dose parameters. This paper presents the effect of carbon dioxide content in gaseous fuel on the combustion process and emission of toxic compounds in the engine examined.

scholarly journals EFFECT OF CNG IN A FUEL DOSE ON THE COMBUSTION PROCESS OF A COMPRESSION-IGNITION ENGINE

Transport ◽  
2015 ◽  
Vol 30 (2) ◽  
pp. 162-171 ◽  
Author(s):  
Maciej Mikulski ◽  
Sławomir Wierzbicki
Keyword(s):  
Natural Gas ◽  
Combustion Chamber ◽  
Alternative Fuels ◽  
Combustion Process ◽  
Diesel Oil ◽  
Dual Fuel ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Compression Ignition Engines ◽  
Main Component

Currently, one of the major trends in the research of contemporary combustion engines involves the potential use of alternative fuels. Considerable attention has been devoted to methane, which is the main component of Natural Gas (NG) and can also be obtained by purification of biogas. In compression-ignition engines fired with methane or Compressed Natural Gas (CNG), it is necessary to apply a dual-fuel feeding system. This paper presents the effect of the proportion of CNG in a fuel dose on the process of combustion. The recorded time series of pressure in a combustion chamber was used to determine the repeatability of the combustion process and the change of fuel compression-ignition delay in the combustion chamber. It has been showed that NG does not burn completely in a dual-fuel engine. The best conditions for combustion are ensured with higher concentrations of gaseous fuel. NG ignition does not take place simultaneously with diesel oil ignition. Moreover, if a divided dose of diesel is injected, NG ignition probably takes place at two points, as diesel oil.

scholarly journals Applying detailed chemistry for the dual-fuel engine combustion process simulation using CFD approach

2021 ◽  
Vol 2061 (1) ◽  
pp. 012063
Author(s):  
V N Grinev ◽  
A V Kozlov ◽  
N S Zuev
Keyword(s):  
Experimental Data ◽  
Internal Combustion Engines ◽  
Fuel Efficiency ◽  
Combustion Process ◽  
Propagation Speed ◽  
Fuel Mixture ◽  
Dual Fuel ◽  
Detailed Chemistry ◽  
Pilot Fuel ◽  
Dual Fuel Engines

Abstract Modern research in the area of internal combustion engines is focused on searching and investigating the technologies that will improve fuel efficiency and decrease emissions. The application of dual-fuel engines is considered a potential solution to these problems. In the dual-fuel engine, the natural gas-air mixture is ignited by a small amount of diesel fuel directly injected into a combustion chamber. This paper aims to develop a detailed chemistry mechanism for 3D simulation of the combustion process of a dual-fuel engine, providing sufficient convergence with the experimental data. It should be noted that sufficient convergence must also be provided in terms of such parameters as pilot fuel ignition delay and premixed air-fuel mixture flame propagation speed. In the course of the research, the analysis of the most commonly used detailed chemistry mechanisms for calculation of the combustion process and mechanisms’ disadvantages was performed. The results obtained with the use of the detailed mechanisms were compared with the results obtained without using detailed chemistry and with the experimental data as well.

Analysis of Potential Application of Biogas Fuel in Modern Compression-Ignition Engines

2017 ◽  
Author(s):  
Michał Smieja ◽  
Sławomir Wierzbicki
Keyword(s):  
Fossil Fuel ◽  
Dual Fuel ◽  
Compression Ignition ◽  
Spark Ignition Engines ◽  
Fermentation Processes ◽  
Compression Ignition Engines ◽  
Biogas Plants ◽  
Ci Engine ◽  
The One ◽  
Toxic Fumes

Limited fossil fuel supplies and the necessary reduction in toxic fumes emission to the atmosphere are the main motives in conducting a search for the new, effective energy supplies. The one with potential is biogas. It is the product of natural fermentation processes of municipal waste in landfills or is produced in biogas plants out of agricultural and green waste. Due to creation under different conditions, its chemical composition varies. This is enormous obstacle in its effective application. Biogas is easily applied to fuel spark-ignition engines however intensive attempts are made to employ it in much more effective compression-ignition engines. Application of biogas require the use of dual-fuel CI engine. The point of the research described in this paper is to show the influence of different methanecarbon dioxide composition ratio in biogas on dual-fuel CI engine effectiveness.

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