Effects of Air and Fuel Flow on the Dynamic Performance for a Turboshaft Gas Turbine Engine Part I: Modeling and Simulation

Abstract

The dynamic performance of a turboshaft gas turbine engine is investigated in this paper. The air flows inlet to the engine and to the power turbine, are controlled by means of two guide vanes cascade. The displacement of the inlet guide vanes is controlled by means of two electrohydraulic servo actuators. The fuel flow rate is controlled by another electrohydraulic controller incorporating a series pressure compensated flow control valve. The equation describing the basic system subsystems and controllers were deduced and applied to develop a simulation program. The simulation program of the electrohydraulic servo controllers was validated experimentally. The engine dynamic performance is studied theoretically using the developed computer simulation program. Simulated results are shown for the transient response of the engine air and fuel flow control systems and its effect on the engine performance. The simulation results of engine air flow control show an agreement with the validated experimental results.

Effects of Air and Fuel Flow on the Dynamic Performance for a Turboshaft Gas Turbine Engine

“…SIMULINK program is used to simulate the mathematical model. Sample of the simulation results for the engine with turbine inlet temperature control has been shown in part I of this work [15]. Herein, the main assumption is the engine works at constant supply current to fuel flow control and at the absence of turbine inlet temperature control.…”

“…The available data from the manufacturer is for the design condition only. In part I of this work [15], the dynamic performance for the studied turboshaft gas turbine engine was investigated. The equations describing the basic system subsystems and controllers were deduced and applied to develop a simulation program.…”

“…The engine dynamic response at instability conditions such as compressor instabilities (surge and stall) and abnormal operation such as (a sudden change in the air or fuel supply or controller malfunction) need to be understood. Thus, the mathematical model is performed and simulated to the whole engine subsystems and the air/fuel flow control system [15]. The engine air flow changes affect on the engine dynamic performance is analyzed.…”