Effect of the chemical composition of fuel on the duration of the ion current signal during combustion

Abstract

The article investigated the effect of excess air coefficient α, the concentration of the combustion activator (hydrogen) in the fuel, the phases of combustion, and the location of ionization sensors in the combustion chamber on the duration of the ion current signal. It was found that the excess air coefficient affects the duration of the ion current signal in the first and second phase of combustion. For α <0.9 and α> 1.1, the duration of the ion current signal increases. It was experimentally found that the activation of combustion due to the addition of hydrogen leads to a decrease in the duration of the ion current signal. This is due to an increase in the rate of chemical reactions in the flame front. Analysis of analytical and graphical dependences showed that taking into account the duration of the ion current signal in the first phase of combustion allows us to predict the duration of the ion current signal in the second phase of combustion. The results work will find a wide application in the creation of control systems and diagnostics of the combustion process in power plants using ionization sensors.