A Multi-Zone Reaction-Based Diesel Combustion Model for Model-Based Control

2017 ◽  
Author(s):  
Yifan Men ◽  
Guoming G. Zhu
Keyword(s):  
Diesel Engine ◽  
Reaction Zone ◽  
Liquid Fuel ◽  
Spherical Shape ◽  
Combustion Model ◽  
Reactive System ◽  
Zone Model ◽  
Diesel Combustion ◽  
Cylinder Pressure ◽  
Air Mixing

A physics-based control-oriented combustion model is developed to accurately predict in-cylinder pressure and temperature of a diesel engine. The model is under the assumption that the combustion chamber consists of three zones: a liquid fuel zone, a reaction zone, and an unmixed zone. These zones are formulated to account for three key events in diesel combustion: fuel evaporation, chemical reaction, and fuel-air mixing, respectively. The liquid fuel zone is assumed to be of spherical shape. The evaporation of fuel is governed by Fick’s first law of diffusion. The reaction zone is modeled as a reactive system consisting of six species and two reaction steps. The burn rate is calculated based on species concentrations and reaction zone temperature. The unmixed zone contains only air and inert gas. The results of simulations are compared to the test data from a GM 6.7 L 8-cylinder Duramax diesel engine. The multi-zone model is shown to be capable of predicting in-cylinder pressure accurately with more degree of freedoms, compared to the singlezone reaction-based model.

scholarly journals Comparing in Cylinder Pressure Modelling of a DI Diesel Engine Fuelled on Alternative Fuel Using Two Tabulated Chemistry Approaches

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Claude Valery Ngayihi Abbe ◽  
Robert Nzengwa ◽  
Raidandi Danwe
Keyword(s):  
Diesel Engine ◽  
Combustion Model ◽  
Biodiesel Fuel ◽  
Zone Model ◽  
Cylinder Pressure ◽  
Model Based ◽  
Engine Design ◽  
Tabulated Chemistry ◽  
Di Diesel Engine ◽  
Simulation Purpose

The present work presents the comparative simulation of a diesel engine fuelled on diesel fuel and biodiesel fuel. Two models, based on tabulated chemistry, were implemented for the simulation purpose and results were compared with experimental data obtained from a single cylinder diesel engine. The first model is a single zone model based on the Krieger and Bormann combustion model while the second model is a two-zone model based on Olikara and Bormann combustion model. It was shown that both models can predict well the engine’s in-cylinder pressure as well as its overall performances. The second model showed a better accuracy than the first, while the first model was easier to implement and faster to compute. It was found that the first method was better suited for real time engine control and monitoring while the second one was better suited for engine design and emission prediction.

Prediction of Combustion Pressure, NOx and Soot for D.I. Diesel Engine by Simplified Model

2013 ◽  
Author(s):  
N. H. Walke ◽  
M. R. Nandgaonkar ◽  
N. V. Marathe
Keyword(s):  
Diesel Engine ◽  
Prediction Models ◽  
Low Complexity ◽  
Simplified Model ◽  
Combustion Model ◽  
Zone Model ◽  
Cylinder Pressure ◽  
Model Fuel ◽  
Di Diesel Engine ◽  
Soot Emissions

Due to stricter emission norms, diesel engine is facing challenges of in-cylinder emissions reduction. Low complexity emissions prediction models are desired, with a long term objective to extend it to emissions prediction during transient operations. This paper is focused on the formulation and investigation of simplified model for prediction of in-cylinder pressures, temperatures engine-out NOx and Soot emissions. Being a predictive model, this does not require cylinder pressure as an input. To have better computational efficiency, a single-zone model is used for the combustion model. Fuel burning rate is predicted using Watson model. Two-zone model has been formulated to predict NOx and Soot emissions. Flame temperatures are predicted by enthalpy balance. Thermal NO concentration is predicted by using Zeldovich mechanism. Soot prediction is based on approach proposed by Hiroyasu. Prediction model is validated using a Turbocharged DI Diesel engine, at various speed-load conditions. The predicted results of the in-cylinder pressure histories, NOx emissions and Soot emissions are in good agreement with the measured data.

The Effect of Piston Bowl and Spray Configuration on Diesel Combustion and Emissions

2011 ◽  
Author(s):  
Bassem H. Ramadan ◽  
Charles L. Gray ◽  
Fakhri J. Hamady ◽  
Cody Squibb ◽  
Harold J. Schock
Keyword(s):  
Spray Angle ◽  
Diesel Combustion ◽  
Cylinder Pressure ◽  
Fuel Injector ◽  
Fuel Injectors ◽  
Rich Mixture ◽  
Piston Bowl ◽  
Air Mixing ◽  
Fuel Mass Fraction ◽  
Insight Into

A numerical and experimental study of the effect of piston bowl and spray configuration on diesel combustion and emissions has been conducted. The objective of this study is to gain better understanding of the effect of the piston bowl shape and fuel injector configuration on fuel-air mixing, combustion, and emissions in a diesel engine. Ideally, a uniform fuel-air mixture in the cylinder is desired to prevent the formation of regions containing a rich mixture, where soot is usually formed, and regions of lean mixtures, where nitrogen oxides are formed. Different piston bowl shapes and fuel injectors (number of nozzles, spray angle) have been considered and simulated using computational fluid dynamics and experiments. CFD calculations of fuel mass fraction, and measurements of cylinder pressure and emissions species are included. The results show that computer simulations coupled with experiments provide insight into the interactions between fluid flow, fuel-air mixing, combustion, and emissions.

scholarly journals The Heat Transfer Study in the Diesel Engine Combustion Chamber Using a Two-Zone Combustion Model

2020 ◽  
Vol 7 (4) ◽  
pp. 614-620
Author(s):  
Brahim Menacer ◽  
Naima Khatir ◽  
Mostefa Bouchetara ◽  
Ahmed Amine Larbi ◽  
Cherif Belhout
Keyword(s):  
Heat Transfer ◽  
Diesel Engine ◽  
Combustion Chamber ◽  
Fuel Consumption ◽  
Combustion Engine ◽  
Simulation Software ◽  
Combustion Model ◽  
Zone Model ◽  
Cylinder Wall ◽  
Simulation Results

The study of heat transfer phenomena in diesel engines is a very complex task considering the number of engine components such as intake and exhaust manifolds, lubricant oil and coolant subsystems, the different heat transfer mechanisms (conduction, convection, and radiation). This paper presents simulation results using a dual-zone model associated to GT-Suite simulation software for the calculation of convective heat transfer from gas to the cylinder wall, radiation heat transfer, gas pressure and temperature for low, partial and full load engine as a function of crank angle for a single-cylinder diesel engine. In this present article, a numerical simulation model was created to foresee the main combustion characteristics, and the simulated results were approved through the reference experiment data. Simulation results showed that any increase in the mass of fuel injected into the combustion chamber would generate a significant increase in the level of pressure and temperature of the combustion gases in the cylinder. This means that despite the improved power performance, excessive fuel consumption would have a negative effect on the thermal behavior and consequently on the life of the engine. The essential objective of any combustion engine development is to reduce fuel consumption while maintaining or improving the engine's power output.

scholarly journals Empirical soot formation and oxidation model

2009 ◽  
Vol 13 (3) ◽  
pp. 35-46 ◽  
Author(s):  
Karima Boussouara ◽  
Mahfoud Kadja
Keyword(s):  
Internal Combustion Engines ◽  
Diffusion Flames ◽  
Soot Formation ◽  
Internal Combustion ◽  
Combustion Model ◽  
Diesel Combustion ◽  
Combustion Engines ◽  
Particulate Emission ◽  
Cycle Simulation ◽  
Air Mixing

Modelling internal combustion engines can be made following different approaches, depending on the type of problem to be simulated. A diesel combustion model has been developed and implemented in a full cycle simulation of a combustion, model accounts for transient fuel spray evolution, fuel-air mixing, ignition, combustion, and soot pollutant formation. The models of turbulent combustion of diffusion flame, apply to diffusion flames, which one meets in industry, typically in the diesel engines particulate emission represents one of the most deleterious pollutants generated during diesel combustion. Stringent standards on particulate emission along with specific emphasis on size of emitted particulates have resulted in increased interest in fundamental understanding of the mechanisms of soot particulate formation and oxidation in internal combustion engines. A phenomenological numerical model which can predict the particle size distribution of the soot emitted will be very useful in explaining the above observed results and will also be of use to develop better particulate control techniques. A diesel engine chosen for simulation is a version of the Caterpillar 3406. We are interested in employing a standard finite-volume computational fluid dynamics code, KIVA3V-RELEASE2.

Numerical Investigation on DI Diesel Engine Running With Eucalyptus Biodiesel and its Blends

2012 ◽  
Author(s):  
L. Tarabet ◽  
K. Loubar ◽  
Mohand S. Lounici ◽  
S. Hanchi ◽  
M. Tazerout
Keyword(s):  
Diesel Engine ◽  
Zone Model ◽  
Cylinder Pressure ◽  
Brake Thermal Efficiency ◽  
Brake Power ◽  
Di Diesel Engine ◽  
American Standard ◽  
Astm D6751 ◽  
Thermo Physical Properties

The aim of the present work is to investigate the possibility of using eucalyptus biodiesel and its blends with diesel fuel as an alternative fuel for diesel engines. Eucalyptus oil is converted to biodiesel with ethanol using sodium hydroxide as a catalyst. The characterization of the obtained biodiesel shows that the thermo-physical properties are in the range recommended by American Standard (ASTM D6751). Innovative biodiesel development tests on the diesel engine require a lot of time and efforts. Here, mathematical model, which is based on the thermodynamic single zone model, is developed to analyze the combustion characteristics such as cylinder pressure and the performance characteristics such as brake power, brake thermal efficiency and specific fuel consumption of a DI diesel engine.

Numerical Prediction of Fluid Flow and Diesel Combustion in a Pre-Chamber and Main Chamber

2005 ◽  
Author(s):  
Bassem H. Ramadan ◽  
Prashant Ahire
Keyword(s):  
Fluid Flow ◽  
Diesel Combustion ◽  
Cylinder Pressure ◽  
Main Chamber ◽  
Ic Engine ◽  
Piston Bowl ◽  
Air Mixing ◽  
Model Fluid ◽  
Computational Fluid Dynamics Cfd ◽  
Turbulence Generation

In this study computational fluid dynamics (CFD) was used to model fluid flow and diesel combustion in an IC engine that uses a pre-chamber and a main-chamber. The pre-chamber is located in the cylinder head and a bowl in the piston serves as the main chamber. The study considers the effect of diesel combustion in the pre-chamber on turbulence generation and hence fuel-air mixing and combustion in the piston-bowl. Diesel fuel was injected directly into the pre-chamber and the piston bowl at different times. In order to better determine the effect of pre-chamber combustion on the main chamber combustion, various pre-chamber injection timings were considered. The results show that pre-chamber combustion caused the average cylinder pressure to increase by up to 20% in some cases.

Numerical Simulation of the Effects of the Nozzle Parameters on In-Cylinder Fuel and Air Mixing Process

2013 ◽  
Vol 401-403 ◽  
pp. 218-221
Author(s):  
Qi Liu ◽  
Guang Yao Ouyang ◽  
Shi Jie An ◽  
Yu Peng Sun
Keyword(s):  
Numerical Simulation ◽  
Diesel Engine ◽  
Fuel Injection ◽  
Combustion Model ◽  
Engine Fuel ◽  
Three Dimension ◽  
Mixing Process ◽  
Fuel Injector ◽  
Injection Process ◽  
Air Mixing

In order to study the injection property of diesel engine fuel injector, the three-dimension combustion model of TBD620 diesel engine is constructed on the AVL Fire software platform. A numerical simulation of the two injectors’ fuel injection process at different load conditions has been done. The influence on fuel and air mixing process is analyzed. The results show that the special injector has a good performance at low load, but the standard injector is more favorable for fuel and air fully mixing at high load.

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