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.

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.

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.

The Effect of Mahua (Madhuca Longfolia) Oil With Dioxane Fuel Blends on Diesel Engine and Studies on Combustion and Emission Characteristics

2009 ◽  
Author(s):  
K. Ashok ◽  
N. Alagumurthi ◽  
C. G. Saravanan
Keyword(s):  
Diesel Engine ◽  
Vegetable Oil ◽  
Diesel Fuel ◽  
Emission Characteristics ◽  
Cylinder Pressure ◽  
Gas Analyzer ◽  
Blend Ratio ◽  
Fuel Blends ◽  
Mahua Oil ◽  
Di Diesel Engine

An organic compound, Dioxane, is blended to reduce the viscosity of raw vegetable oil (Mahua). A dilute blend was prepared by mixing with raw vegetable oil (Mahua) and 10% dioxane in volume basis. Tests were conducted on a single cylinder, water cooled, DI diesel engine coupled with the eddy current dynamometer. Emissions like HC, NOX, etc., were measured by using gas analyzer and smoke density was measured by using smoke meter. The cylinder pressure, heat release rate were measured by combustion analyzer. From the experimental investigation, it was observed that operating at a blend ratio of 10% diesel-80% mahua oil-10% Dioxane significantly reduced the HC and NOx emissions when compared to diesel fuel. It was also observed, the variation of break thermal efficiency is almost same to that of diesel fuel. Hence, it can be concluded that raw vegetable oil (mahua) with Dioxane blend could partially replace the diesel, as a fuel.

scholarly journals Implementation and Assessment of a Model-Based Controller of Torque and Nitrogen Oxide Emissions in an 11 L Heavy-Duty Diesel Engine

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4704 ◽  
Author(s):  
Fabio Cococcetta ◽  
Roberto Finesso ◽  
Gilles Hardy ◽  
Omar Marello ◽  
Ezio Spessa
Keyword(s):  
Diesel Engine ◽  
Nitrogen Oxides ◽  
Rapid Prototyping ◽  
Nitrogen Oxide ◽  
Combustion Model ◽  
Heavy Duty ◽  
Nitrogen Oxide Emissions ◽  
Model Based ◽  
Brake Mean Effective Pressure ◽  
On The Road

A previously developed model-based controller of torque and nitrogen oxides emissions has been implemented and assessed on a heavy-duty 11 L FPT prototype Cursor 11 diesel engine. The implementation has been realized by means of a rapid prototyping device, which has allowed the standard functions of the engine control unit to be by-passed. The activity was carried out within the IMPERIUM H2020 EU Project, which is aimed at reducing the consumption of fuel and urea in heavy-duty trucks up to 20%, while maintaining the compliance with the legal emission limits. In particular, the developed controller is able to achieve desired targets of brake mean effective pressure (BMEP) (or brake torque) and engine-out nitrogen oxides emissions. To this aim, the controller adjusts the fuel quantity and the start of injection of the main pulse in real-time. The controller is based on a previously developed low-throughput combustion model, which estimates the heat release rate, the in-cylinder pressure, the BMEP (or torque) and the engine-out nitrogen oxide emissions. The controller has been assessed at both steady-state and transient operations, through rapid prototyping tests at the engine test bench and on the road.

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