Mathematical modeling of the chemical kinetics of the processes of fuel ignition in the combustion chamber of a diesel engine on start modes


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Abstract

The article presents results of calculation and theoretical research, aimed at ensuring the compliance of diesel engines with the requirements of regulatory technical documents for starting characteristics. In course of the study, the mathematical model of chemical kinetics, ignition processes and fuel combustion in the combustion chamber was developed. Model can be used for predicting diesel engine starting characteristics. Model was realized as separate software. The developed mathematical model is implemented in the three-dimensional gas-dynamic model of processes in combustion chamber. In the course of the fuel combustion reactions chemical kinetics computational studies on diesel start-up modes, it was determined, that to ensure ignition of fuel in combustion chamber, required gases local temperature should be at least 1350 K. The permissible proportion of carbon oxide in the gases, produced by intake air heater, should not exceed 40 %. It is shown, that increase of compression ration, at a constant gas temperature, has little effect on the chemical kinetics of pre-flame processes and combustion reaction rate. It is revealed, that temperature of the combustion chamber walls has a prevailing effect on the possibility of fuel ignition. The wall temperatures have been determined, to which it is necessary to heat the diesel engine using pre-start heating and start facilitate tools for various environmental temperatures, crankshaft rotational speeds, compression ratios and concentration of the intake air heater combustion products. The developed mathematical model and software are used in current research and development work of the South Ural State University to create new and modernize existing diesel engines of various types, produced by Chelyabinsk tractor plant.

About the authors

V. N Bondar'

South Ural State University (National Research University)

PhD in Engineering

A. A Malozyomov

South Ural State University (National Research University)

DSc in Engineering

V. S Kukis

South Ural State University (National Research University)

DSc in Engineering

E. A Omel'chenko

Omsk branch of the Military Academy of logistics n.a. general Andrey V. Khrulyov

Email: idem74@mail.ru
PhD in Engineering

G. A Malozyomov

South Ural State University (National Research University)

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Copyright (c) 2018 Bondar' V.N., Malozyomov A.A., Kukis V.S., Omel'chenko E.A., Malozyomov G.A.

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