Aspects regarding internal flow in combustion chamber of turbojet engines

In this paper are presented the results obtained by modelling and simulation of the combustion in a turbojet engine. The study of the mathematical model represented by the equations which described the combustion process was made by using the software FLUENT 6.1. The paper is focused on the establishment of the link between the control laws of the turbojet engine (whose main parameter is the fuel flow rate in combustion chamber), optimal characteristics of the burned process and the shape of combustion chamber. Taking into account the characteristics of the fuel for turbojet engines, the software used allows to study the optimal shape of the combustion chamber, position of injectors, outlet section (which represents the inlet section of turbine) and also, allows to study the optimal control law for a certain type of turbojet engine (monorotor, birotor, turbofan, etc). The main conclusion is represented by the link between the performance of burned process which takes place in the combustion chamber and implication upon optimal control law and programme for a turbojet engine. Even if the combined control laws have more parameters, the most important of them is the fuel rate.