Study of Air Excess in Relation with Engine Parameters for a Generalized Reaction Based on JET-A Fuel

Abstract

In this paperwork we are studying the performance of a combustion process into a jet engine combustion chamber, more specifically the relations between excess of air, overall pressure ratio and inlet turbine temperature for a combustion reaction based on a jet A fuel. The study present a method of calculating the excess of air for a generalized combustion reaction based on Jet A fuel indicated by the general formula , for different temperatures of air, different temperatures of fuel and different inlet turbine temperatures. The result of this study is to achieve diagrams in which are presented the variation of air excess with engine parameters who participate in combustion process and to performed a computing program in which it is calculated the exactly value of excess of air for any outlet compressor temperatures, any inlet turbine temperatures and different fuel temperatures.

Analytical Calculation Model of the TV3-117 Turboshaft Working Regimes Based on Experimental Data

“…Since there is not sufficient data to determine certain main engine parameters, a preliminary step was to determine the air excess that is useful for the air and gas mass flow calculation. The calculation method of air excess starts from the enthalpy equality relation between reactants HR and reaction products HP from the general combustion reaction [22].…”

“…From this point, the analytical model, continues with the calculation of air excess [22] at each regime by applying the same method described for the takeoff.…”