Quasidimensional Modeling of Diesel Combustion Using Detailed Chemical Kinetics

2017 ◽  
Vol 139 (8) ◽  
Author(s):  
Aron P. Dobos ◽  
Allan T. Kirkpatrick
Keyword(s):  
Diesel Engine ◽  
Heat Release ◽  
Chemical Kinetics ◽  
Computational Cost ◽  
Kinetic Mechanism ◽  
Chemical Kinetic ◽  
Detailed Chemical Kinetics ◽  
Air Mixing ◽  
Primary Reference ◽  
Detailed Chemical

This paper presents an efficient approach to diesel engine combustion simulation that integrates detailed chemical kinetics into a quasidimensional fuel spray model. The model combines a discrete spray parcel concept to calculate fuel-air mixing with a detailed primary reference fuel chemical kinetic mechanism to determine species concentrations and heat release in time. Comparison of predicted pressure, heat release, and emissions with data from diesel engine experiments reported in the literature shows good agreement overall, and suggests that spray combustion processes can be predictively modeled without calibration of empirical burn rate constants at a significantly lower computational cost than standard multidimensional (CFD) tools.

A New Skeletal Chemical Kinetic Mechanism of Ethanol Combustion for HCCI Engine Simulation

2012 ◽  
Vol 614-615 ◽  
pp. 381-384
Author(s):  
Qian Dai ◽  
Hua Ye Guan
Keyword(s):  
Kinetic Mechanism ◽  
Chemical Kinetic ◽  
Simplified Model ◽  
Detailed Chemical Kinetics ◽  
Detailed Model ◽  
Engine Simulation ◽  
Chemical Reaction Mechanism ◽  
Ethanol Combustion ◽  
Chemical Kinetic Mechanism ◽  
Detailed Chemical

According to the detailed chemical kinetic mechanism of ethanol proposed by the U．S．Lawrence Livermore Laboratory, this paper analyzes the main approach of ethanol oxidation. Based on the detailed chemical kinetics mechanism, a skeletal chemical reaction mechanism is presented by reaction path analysis．Thus a simplified model is constructed, which consists of 26 species and 26 reactions．And then the comparative studies were given between the simplified model and the detailed model．The simulation results show that simplified model and detailed model have good consistency.

Progress in the Development of Chemical Kinetics Databases for the Combustion of Real Fuels

2008 ◽  
Author(s):  
Wing Tsang
Keyword(s):  
Fluid Dynamics ◽  
Chemical Kinetics ◽  
Liquid Fuel ◽  
Chemical Kinetic ◽  
Vlsi Circuits ◽  
Wind Tunnel Testing ◽  
Detailed Chemical Kinetics ◽  
Combustion Technology ◽  
Kinetics Of ◽  
Detailed Chemical

Modern Computational Fluid Dynamics codes have increasing capabilities for taking into account detailed chemical kinetics [1, 2]. This opens the possibility of simulating the combustion of real fuels in industrial devices. This will bring combustion technology in line with modern developments in cutting edge science. One could not design VLSI circuits without simulations. Similarly, the design of modern airplanes depends on simulations before final wind tunnel testing. A key to the proper simulation of the chemistry in combustion is the kinetics database. The aim of this paper is to describe the current situation in this area. We will begin by discussing the special problems posed by the nature of the fuel. We will then define the elements in a proper chemical kinetic database. Currently used databases for the simulation of combustion will be critically examined. The importance of a more fundamentally based database will be emphasized. Finally some recent work pertaining to the chemical kinetics of real liquid fuel molecules will be described.

scholarly journals Modelling of Self-Ignition in Spark-Ignition Engine Using Reduced Chemical Kinetics for Gasoline Surrogates

Fluids ◽  
2019 ◽  
Vol 4 (3) ◽  
pp. 157 ◽  
Author(s):  
Ahmed Faraz Khan ◽  
Philip John Roberts ◽  
Alexey A. Burluka
Keyword(s):  
Chemical Kinetics ◽  
Octane Number ◽  
Kinetic Mechanism ◽  
Spark Ignition ◽  
Chemical Kinetic ◽  
Spark Ignition Engine ◽  
Detailed Chemical Kinetics ◽  
Kinetic Predictions ◽  
Kinetic Mechanisms

A numerical and experimental investigation in to the role of gasoline surrogates and their reduced chemical kinetic mechanisms in spark ignition (SI) engine knocking has been carried out. In order to predict autoignition of gasoline in a spark ignition engine three reduced chemical kinetic mechanisms have been coupled with quasi-dimensional thermodynamic modelling approach. The modelling was supported by measurements of the knocking tendencies of three fuels of very different compositions yet an equivalent Research Octane Number (RON) of 90 (ULG90, PRF90 and 71.5% by volume toluene blended with n-heptane) as well as iso-octane. The experimental knock onsets provided a benchmark for the chemical kinetic predictions of autoignition and also highlighted the limitations of characterisation of the knock resistance of a gasoline in terms of the Research and Motoring octane numbers and the role of these parameters in surrogate formulation. Two approaches used to optimise the surrogate composition have been discussed and possible surrogates for ULG90 have been formulated and numerically studied. A discussion has also been made on the various surrogates from the literature which have been tested in shock tube and rapid compression machines for their autoignition times and are a source of chemical kinetic mechanism validation. The differences in the knock onsets of the tested fuels have been explained by modelling their reactivity using semi-detailed chemical kinetics. Through this work, the weaknesses and challenges of autoignition modelling in SI engines through gasoline surrogate chemical kinetics have been highlighted. Adequacy of a surrogate in simulating the autoignition behaviour of gasoline has also been investigated as it is more important for the surrogate to have the same reactivity as the gasoline at all engine relevant p − T conditions than having the same RON and Motored Octane Number (MON).

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