# Duration of Ignition Delay of Fuel–Air Mixture in Diesel Engines

• V. F. Guskov
• A. N. Gots
Conference paper
Part of the Lecture Notes in Mechanical Engineering book series (LNME)

## Abstract

Empirical and semi-empirical dependences for determination of ignition delay time of the fuel–air mixture τi in piston engines with compression ignition were analyzed. While the mathematical simulation of the piston engine cycle, it must be determined the ignition delay time of mixture. It allows not only to forecast the start process of combustion and determine the location of the area of rapid pressure increase relative to the top dead center, but also to improve the angle of start of fuel injection by energy, economical, or environmental indicators. This task is solved at any complexity of the mathematical model of the cycle and is the main one when we were compared calculated and test indicator diagrams of the piston engine cycle. The interdependences obtained by various researchers to determine the ignition delay time of the fuel–air mixture in diesel engines were analyzed. Estimates suggest that a number of formulas give values τi unreal for automobile and tractor engines. Analysis of indicator diagrams of tractor diesel 3CH10.5/12 allowed to rank the determining factors (pressure and temperature of the working medium, speed mode, delivery ratio of air) by the degree of their influence on the ignition delay time of the fuel–air mixture. On this basis, dependence and recommendations can be given for calculating the duration of the ignition delay time of the fuel–air mixture.

## Keywords

Ignition delay time Fuel–air mixture Diesel Pressure Temperature Working medium

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