DEVELOPMENT OF A DYNAMIC MODEL FOR SIMULATION OF REAL-TIME TRANSIENT TURBOJET ENGINE PERFORMANCE IN SIMULINK

This study deals with developing a dynamic model with capacity for use in aero-Thermodynamic real-time performance modeling of turbojet engines in MATLAB/Simulink environment. The elements of the engine are modeled by means of non-linear equations and using the inter component volume dynamics method. Through the use of the design point variables in the simulation, the model is capable to adapting with the characteristics of a particular engine. The three factors including, rotor dynamic, volume dynamic and heat soakage are considered in the dynamic model. To validate the modeling approach, the rotational speed and net thrust are compared with the results of the GSP program. The results show the ability of the model to simulate the transient performance such that the maximum error is estimated less than 4 percent. Then a new method to reduce the computational time and create a real-time performance capabilities, was studied. The results indicate that it is possible to select a fixed time step for solver and time scaling the smallest volume (from specified control volumes in the model), the real-time ability to be achieved. In these circumstances, the error in calculation of basic parameters of the engine is less than 0.5 percent.