Transient performance simulation of gas turbine engine integrated with fuel and control systems

摘要

Two new methods for the simulation of gas turbine fuel systems, one based onan inter-component volume (ICV) method, and the other based on the iterativeNewton Raphson (NR) method, have been developed in this study. They are ableto simulate the performance behaviour of each of the hydraulic components suchas pumps, valves, metering unit of a fuel system, using physics-based models,which potentially offer more accurate results compared with those using transferfunctions. A transient performance simulation system has been set up for gasturbine engines based on an inter-component volume (ICV). A proportional-integral (PI) control strategy is used for the simulation of engine control systems.An integrated engine and its control and hydraulic fuel systems has been set upto investigate their coupling effect during engine transient processes. Thedeveloped simulation methods and the systems have been applied to a modelturbojet and a model turboshaft gas turbine engine to demonstrate theeffectiveness of both two methods. The comparison between the results ofengines with and without the ICV method simulated fuel system models showsthat the delay of the engine transient response due to the inclusion of the fuelsystem components and introduced inter-component volumes is noticeable,although relatively small. The comparison of two developed methods applied toengine fuel system simulation demonstrate that both methods introduce delayeffect to the engine transient response but the NR method is ahead than the ICVmethod due to the omission of inter-component volumes on engine fuel systemsimulation. The developed simulation methods are generic and can be applied tothe performance simulation of any other gas turbines and their control and fuelsystems.A sensitivity analysis of fuel system key parameters that may affect the enginetransient behaviours has also been achieved and represented in this thesis.Three sets of fuel system key parameters have been introduced to investigatetheir sensitivities, which are, the volumes introduced for ICV method applied tofuel system simulation; the time constants introduced into those first order lags tosimulate the valve movements delay and fuel spray delay effect; and the fuelsystem key performance and structural parameters.