HEAT RELEASE RATE OF A COMPRESSION IGNITION ENGINE FUELED WITH DIESEL OIL AND A DIESEL-STRAIGHT SOYBEAN OIL BLEND

In this research, there are two major sections for analysis: the characteristics of gasoline and diesel dual-fuel combustion and their application to operating load extension with high thermal efficiency and low emissions. All the experiments were completed using a single-cylinder compression ignition engine with 395 cc displacement. In the first section, the dual-fuel combustion modes were classified into three cases by their heat release rate shapes. Staying at 1500 r/min with a total value of 580 J of low heat for each cycle condition, the diesel injection timing was varied from before top dead center with a 6–46 °crank angle with 70% of gasoline fraction based on the low heating value. Among the modes were two suitable dual-fuel combustion modes for a premixed compression ignition. The first suitable mode shows multiple peaks in the heat release rate (mode 2) and the second suitable mode shows a single peak with a “bell-shaped” heat release rate (mode 3). These two dual-fuel combustion types showed a high gross indicated thermal efficiency of up to 46%. Based on the results in the first section, the practical application of dual-fuel premixed compression ignition combustion was investigated considering a high thermal efficiency and a high-load condition. At a 1500 r/min/gross indicated mean effective pressure of 6.5 bar, 48% of the gross indicated thermal efficiency was obtained by using dual-fuel premixed compression ignition combustion mode 3. This mode was typical of a “reactivity controlled compression ignition,” while the nitrogen oxides and the particulate matter emissions satisfied the EURO-6 regulation (0.21 g/kW h and 2.8 mg/m3, respectively). In addition, a high thermal efficiency (45%) with low maximum pressure rise rate, NOx (nitrogen oxides), and particulate matter emissions was obtained at 2000 r/min/gross indicated mean effective pressure 14 bar condition by the adjustment of dual-fuel premixed compression ignition combustion mode 2. As a result, this research contributes to the understanding and practical application of dual-fuel combustion for a light-duty compression ignition engine.

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Combustion Characteristics, Emissions and Heat Release Rate Analysis of a Homogeneous Charge Compression Ignition Engine with Exhaust Gas Recirculation Fuelled with Diesel

Energy & Fuels ◽

10.1021/ef801010m ◽

2009 ◽

Vol 23 (5) ◽

pp. 2396-2404 ◽

Cited By ~ 8

Author(s):

Miguel Torres García ◽

Francisco J. Jiménez-Espadafor Aguilar ◽

Tomás Sánchez Lencero

Keyword(s):

Heat Release ◽

Heat Release Rate ◽

Release Rate ◽

Exhaust Gas Recirculation ◽

Combustion Characteristics ◽

Exhaust Gas ◽

Compression Ignition ◽

Compression Ignition Engine ◽

Rate Analysis ◽

Gas Recirculation

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Evaluating temperature and fuel stratification for heat-release rate control in a reactivity-controlled compression-ignition engine using optical diagnostics and chemical kinetics modeling

Combustion and Flame ◽

10.1016/j.combustflame.2015.04.009 ◽

2015 ◽

Vol 162 (6) ◽

pp. 2729-2742 ◽

Cited By ~ 85

Author(s):

Sage L. Kokjohn ◽

Mark P.B. Musculus ◽

Rolf D. Reitz

Keyword(s):

Heat Release ◽

Chemical Kinetics ◽

Heat Release Rate ◽

Release Rate ◽

Rate Control ◽

Optical Diagnostics ◽

Compression Ignition ◽

Compression Ignition Engine ◽

Reactivity Controlled Compression Ignition ◽

Fuel Stratification

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Experimental and Simulation of Diesel Engine Fueled with Biodiesel with Variations in Heat Loss Model

Energies ◽

10.3390/en14061622 ◽

2021 ◽

Vol 14 (6) ◽

pp. 1622

Author(s):

Daniel Romeo Kamta Legue ◽

Zacharie Merlin Ayissi ◽

Mahamat Hassane Babikir ◽

Marcel Obounou ◽

Henri Paul Ekobena Fouda

Keyword(s):

Heat Release ◽

Heat Loss ◽

Heat Release Rate ◽

Release Rate ◽

Diffusion Combustion ◽

Cylinder Wall ◽

Compression Ignition Engine ◽

Experimental Conditions ◽

Load Range ◽

Combustion Phase

This study presents an experimental investigation and thermodynamic 0D modeling of the combustion of a compression-ignition engine, fueled by an alternative fuel based on neem biodiesel (B100) as well as conventional diesel (D100). The study highlights the effects of the engine load at 50%, 75% and 100% and the influence of the heat loss models proposed by Woschni, Eichelberg and Hohenberg on the variation in the cylinder pressure. The study shows that the heat loss through the cylinder wall is more pronounced during diffusion combustion regardless of the nature of the fuels tested and the load range required. The cylinder pressures when using B100 estimated at 89 bars are relatively higher than when using D100, about 3.3% greater under the same experimental conditions. It is also observed that the problem of the high pressure associated with the use of biodiesels in engines can be solved by optimizing the ignition delay. The net heat release rate remains roughly the same when using D100 and B100 at 100% load. At low loads, the D100 heat release rate is higher than B100. The investigation shows how wall heat losses are more pronounced in the diffusion combustion phase, relative to the premix phase, by presenting variations in the curves.

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A quick, simplified approach to the evaluation of combustion rate from an internal combustion engine indicator diagram

Thermal Science ◽

10.2298/tsci0801085t ◽

2008 ◽

Vol 12 (1) ◽

pp. 85-102 ◽

Cited By ~ 5

Author(s):

Miroljub Tomic ◽

Slobodan Popovic ◽

Nenad Miljic ◽

Stojan Petrovic ◽

Milos Cvetic ◽

...

Keyword(s):

Internal Combustion Engine ◽

Heat Release ◽

Heat Release Rate ◽

Release Rate ◽

Combustion Engine ◽

Internal Combustion ◽

Gas Temperature ◽

Compression Ignition Engine ◽

Practical Applications ◽

Simplified Approach

In this paper a simplified procedure of an internal combustion engine in-cylinder pressure record analysis has been presented. The method is very easy for programming and provides quick evaluation of the gas temperature and the rate of combustion. It is based on the consideration proposed by Hohenberg and Killman, but enhances the approach by involving the rate of heat transferred to the walls that was omitted in the original approach. It enables the evaluation of the complete rate of heat released by combustion (often designated as ?gross heat release rate? or ?fuel chemical energy release rate?), not only the rate of heat transferred to the gas (which is often designated as ?net heat release rate?). The accuracy of the method has been also analyzed and it is shown that the errors caused by the simplifications in the model are very small, particularly if the crank angle step is also small. A several practical applications on recorded pressure diagrams taken from both spark ignition and compression ignition engine are presented as well.

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